Propeller diameter available for engine with larger gearcase

Another title could have been Boat propeller Diameter on command trust or big foot motors.

Many factor will influence rpm and diameter is one of them. I am seeing in the last several seasons some large pontoons being pushed by 60 hp engines that are command trust /or Bigfoot. This means that the gear case is in a larger category

The problem is that the lowest pitch props available for a bigfoot 60 hp would be 14×11 and reaching the minimum recommend RPM range becomes impossible….Same engine with a non-command thrust or not a big foot can runs a 2” smaller diameter propeller and a lower pitch is available
the key is the fact that it is also 2 “ shorter in diameter
In this case the lowest pitch available becomes a 12×9 an increase of about 900RPM

At Ace propeller our tech support team will be happy to answer any questions relating to propeller selection.

Piranha boat Propeller absorbs shock

The Piranha modular design allows for blades to be replaced due to damage or to be re-pitched for performance. The key to the patented Piranha boat propeller is the hub. The center hub is made from a high-strength aluminum core, over molded with our specially-formulated composite material.
The Piranha blades are designed to absorb the shock of a propeller strike, which virtually eliminates lower unit damage. The Piranha hub is so strong that it is guaranteed for life, “you damage it, we will replace it.” The Piranha design also eliminates spun propeller hubs.
The replaceable blades are manufactured from a specially formulated high-strength aerospace composite material. The manufacturing process is so precise, that the blade shape and pitch distribution is superior to Stainless Steel and Aluminum. Blade balance is no longer a problem as the Piranha Propeller blades are balanced to 2 times the industry standard. The precise balancing reduces lower unit damage caused by vibration.

Safety on the waterways

Courtesy on the Water.

For all of us to enjoy our boating experience, courtesy and the rules of the waterways are extremely important. From kayakers and canoers, to the fishing boats to the cruisers and the sailers, knowing when to give way, when to slow your boat down to reduce your wake or when to get out of the way are all extremely important. Sometimes common sense plays a big factor to keeping the waterways safe. I know when I am in a 24 foot boat and I see an ocean bound freighter coming down the St. Lawrence, I get out of the way! These freighters take an extremely long distance to slow or even come to a stop. The same for larger cruisers, they do not stop on a dime. As the captains of larger vessels are responsible for their safe progress through the water, common sense is best used when operating a smaller vessel to stay clear and choose your moments when to cross a channel that may mean crossing in front of a larger vessel. Managing your wake of your boat is also your responsibility. Come off plane or reduce your speed when passing a small fishing boat or canoe or kayak to avoid swamping the craft or possibly knocking the occupants out of their boats. Wake board boats need to understand this as well and respect the other crafts on the water as well as the possible damage that large wakes do to the shoreline and docks all along the shoreline. There are more and more of the wakeboard style boats and the type of water sports enjoyed with these type of boats is growing in popularity! Please be careful and use common sense out there. That way everyone can enjoy the days we get to spend out on the water.

I suggest you review the safety requirements for operating your boat and make sure you have all the recommended gear on board for your safety and the safety of your passengers. This includes having a spare propeller on board and the tools to change your prop if you should hit something in the water.

Enjoy the season and your time on the water!

Kevin Rougeau

Spring boating season 2017

Start of the boating season 2017 for those of us who experience a winter! A lot of us are waiting for the nicer weather to show up! Record rainfalls, lots of flooding and swollen riverbanks has delayed some of us from safely accessing launches. The nicer weather is coming soon so take this time to get ready!!!

Whether you’re a seasonal boater down south or from the north, it’s always a good idea to have your motor properly serviced by a qualified dealer and a licensed mechanic. If your boat’s been stored for a period of time, this would involve the first start up, blowing out the fogging oil from last fall’s winterization or storage, making sure all hoses and lines are in good shape (no cracks or leaks), oil has to been changed if you have a 4 stroke or oil levels are full for a 2 stroke. Gear case oil needs to be checked and changed. Changing the spark plugs is always a good idea (at least every 2 seasons) and make sure the engine has proper cooling by changing your impeller every couple of seasons. Your qualified mechanic will ask you all the right questions and help to ensure your boat and motor are running right for the first trip out and for the whole season. If you are a do-it-yourselfer, there is plenty of information on the web and lots of instructional videos on YouTube to show you how to maintain your boat and motor. Make sure you have good clean gas for the initial startup. Fill up your tank so that you are not just running last year’s gas through your motor.
On a regular basis, you should check your trailer and lights particularly after your trailer has been sitting for a while or stored for the winter. Make sure brakes lights, turn signals and running lights all work. Lubricate the wheel bearings on the trailer. Most trailers have bearing buddies that can be easily greased or you may want to consider repacking the wheel bearings. It is also extremely important to ensure your tires are inflated properly and that they do not show signs of excessive wear. Check the requirements stamped on the side of the tire as to proper inflation pressure.

Also check your safety gear on board! We should have all taken some sort of boating safety course. There is a Coast Guard guide which lists all the safety gear that you should have on board. This includes the following but you should check the Coast Guard requirements before you head out on the water:
• Good strong paddle
• Sound/signaling device
• Flare
• Anchor with sufficient rope, 50 ft. minimum
• Lifejackets for everyone on board
• A throw safety cushion and floating rope
• Boat fenders/bumpers and dock tie lines
• Bailer and/or operating bilge pump
• Waterproof flashlight with good batteries
• A spare prop and tools to change it!

CHECK THE COAST GUARD REQUIREMENTS

Check the condition of your propeller. The propeller blades should not be bent or damaged as a damaged blade will affect performance and efficiency of the propeller. Make sure the leading edges of the blades are smooth and not badly chipped.

Remember that when water levels are high in the spring a lot of debris gets dragged off the shore so be careful out there and keep your eyes open to avoid any costly strikes with floating debris.

Have a safe and fun filled boating season this year!
From the Ace Propeller Team!

Michigan wheel 3 blade aluminum propeller

We can help you select the correct propeller

We can help you select the correct propeller the more info we know the more accurate our recommendation

Motor type and manufacturer
Year and horsepower of motor
Length and type of boat
Any current prop info will help. Diameter, pitch and type of material
WOT (wide open throttle) RPM reading with current prop is the best way to know how we can improve your performance
WOT (wide open throttle) RPM reading with current prop if you can answer some or all of the prop info

Also what kind of boating do you do most often. Watersports…cruising ..top speed ?

We will then be able to help you with a more accurate recommendation.

Powertech bravo 2 stainless 5 blade propeller

Technical Boat propeller lingo

Pitch – the theoretical distance in inches that a propeller moves forward in one revolution. Think of a screw in wood. If you increase the angle of the threads, it will move further into the wood in one turn.

Diameter – the diameter in inches of the circle that the blade tips will cut. Or, the distance in inches from a blade tip to the center of the prop, multiplied by two.

Propeller Size – props are named by the diameter inch number, followed by pitch inch number (i.e. 14 x 19 or 14″ diameter x 19″ pitch).

Blade – the part of the prop that acts as a paddle.

Elliptical Blade – one that’s elliptical in shape.

Tapered Blade – a blade that is tapered in shape. (As opposed to round ear or elliptical.)

Cupped Blade – a blade that has a lip built into its trailing edge. (Most do) The lip generally helps a prop hold water. It also adds the equivalent of about 1/2-inch to one-inch of pitch.

Polished – a prop that has had the steel polished from a dull to a shiny finish.

Hub – the center part of the propeller. The hub, as an actual part, is the piece that fits inside the barrel of a prop and what the shaft slides into. If you strike something, the hub breaks free of the barrel and spins so that you don’t damage the drive-train. The word hub is also often referred to as the size of the barrel. (i.e. 4.5″, 4″, 3″, 2.75″)

Skew – a blade whose shape sweeps in a curve that follows its rotation is said to have a skew.

Rake – if a blade sticks straight out of a hub, in other words, is perpendicular to it, that prop has no rake, or zero rake. If the blade leans back more towards the trailing edge of the prop, it is said to have rake. If it leans way back, it is a high rake prop. Rake can be measured in degrees.

powertech propeller

Wise boat propeller advice

I advise boaters to spend as much as it takes to get the right propeller for their boating application. Sometime it means Stainless ( 300hp and up ); sometimes it means 3 blade ;sometimes it means 4 blade; Don’t be too concerned with prop costs because the biggest bang that you can get for the buck, when it comes to boat performance, is with the propeller.

Remember that a slightly incorrect type or size of propeller can seriously reduce several aspects of your boat’s performance.

Of course this doesn’t mean you should spend money unnecessarily. we can help you understand a lot more about propellers and to make a decision as to which propeller could be best for your own boat.

In looking at these questions keep in mind that propellers are always referred to by two numbers. The first number is the ‘diameter’, or straight line distance in inches, from a blade tip to the center of the of the hub, times two. The second number is the ‘pitch’, or theoretical distance in inches that the propeller would travel forward in one single revolution.

Happy new year of boating

Best wishes for a safe and happy new year! Thank you for your patronage and look forward to serving you in 2017!
Safe and Happy Boating on your next outing on the water.

From your Ace Propeller Team!

Happy holidays

Wishing you and you families best wishes for the Holliday seasons

From the Ace propeller team

Michigan wheel 3 blade aluminum propeller

How to find the best propeller for my boat

Finding the right prop for your application is not as easy as you may think. In fact, it is our experience that proper prop selection is one of the most difficult tasks in boating to make sure you are getting optimum performance. Mistakes can be costly in terms of fuel consumption, drive train wear, prop longevity and speed. The right pitch and diameter is not the end of it, but rather just the beginning of the process. There are numerous other aspects to prop selection including rake, cup, surface area, material and the number of blades.
We at Ace propeller can help you choose the best prop for your application

call our tech support at 1-866-799-7767

piranha 3 blade

Boat propeller damage

As gas prices continue to creep up we are getting more and more enquiries from customers on how to improve performance with regards to fuel efficiency. A slightly damaged blade where the leading edge of the propeller has been damaged by running through some sand or gravel. The propeller blade edge should be filed smooth. There should be no dings or chips as these imperfections in the leading edge cause air bubbles and cavitation in the blades of the propeller and reduce performance by reducing the efficiency of the propeller. If the blade is too damaged it will have to be replaced as running a prop that is out of balance because of damaged blades can reduce performance and actually cause damage to the foot of your motor. At the end of the day this costs you at the gas pump or possibly at the repair shop!$$$
The Piranha propeller with the replaceable blade system is a great choice as you can replace one damaged blade at a time for a fraction of the cost of repairing an aluminum propeller or having to replace the propeller by buying a new one.

Inspect your prop regularly! It will save you money and ensure your boat is performing properly.

High altitude will affect performance

Boat propellers are available in several materiel, pitch and diameter and the expert at Ace propeller can help you select the correct boat propeller that will work best at the altitude that you are boating at .Many factors can reduce your RPM in many ways I.E. upgrading to better materiel, increasing the diameter and/or pitch, upgrading to a 4 blade, cupping ect. However the worst effect is altitude…Lack of oxygen makes for terrible performance.

Here is a chart that can help

Altitude chart versus minus in pitch required
3000ft…-1 in pitch
4000ft…-2
5000ft…-3
6000ft…-4
7000ft…-5
8000ft…-6
9000ft…-7 in pitch

I would suggest a composite propeller by Piranha and you can have a set a of blades with a lower pitch for boating at high altitudes.

Piranha composite propellers are superior to any aluminum. Piranha propellers were developed with three things in mind: durability, performance and affordability. A key feature is that the blades are replaceable. You can change the diameter and the pitch, save on the costs involved with propeller repairs, not to mention the potential damage to your gear case. With Piranha you can have some spare blades in the boat for a quick and affordable repair

We also sell the hi-grade aluminum propellers from Michigan wheel and Solas

And of course Powertech Stainless and aluminum propellers

You can call 1-866-799-7767 to place an order

Ace Propeller

Boat propeller cavitation and ventilation

Have you ever run your finger along the face, or edge, of a prop and felt a pitted area? If you have, then you know what cavitation can do to a prop. Given enough use, that pitting will only get deeper and you will end having to replace the prop.

With your prop turning 4000 rpms how are you to know if you have power-robbing and prop-damaging cavitation?

Cavitation very commonly occurs on damaged, or imperfect, propellers and can occur if an attempt is made to transmit too much power through the prop. At high rotating speeds or under heavy load (with high blade lift coefficient), the pressure on the inlet side of the blade can drop below the vapor pressure of the water, resulting in the formation of a pocket of vapor, which can no longer effectively transfer force to the water.

In my manner of thinking, cavitation could be defined as the phenomenon of the formation, rapid collapse, and subsequent implosion of vapor bubbles of a flowing liquid in a region where the pressure of the liquid falls below its vapor pressure. As these bubbles collapse, energy is released in the form of a shock wave that can, and often does, damage the surface of the material in question (Stretching the analogy to a screw, you might say the water thread ‘strips’.)

The true cause of cavitation can arise from several factors, but we see them occur most often, as a result of leading edge imperfections, such as, nicks, dings, scratches, bends, etc.. That said, they can, also, be caused by improper geometry, or upstream imperfections related to the hull, such as, hull design/configuration, hull imperfection, incorrectly installed accessories/appendages, etc.. Since there are so many possible causes, diagnosing the problem should really be done on a per case basis.

Cavitation wastes energy, makes the propeller “noisy” as the vapor bubbles collapse, and most seriously, erodes the prop’s surface due to localized shock waves against the blade surface.

A similar, but quite separate issue is ventilation, which takes place when air is introduced to water around, or to the water flow fed to, a propeller. This can be caused by a number of different sources, such as, porting, over-and-thru hub propellers, tunnel hulls, extreme motor elevation, excessively high trim angles, stepped hulls, or even hull appendages (transducers, pick-ups, and the like). As the propeller meets the aerated water, the water’s flow attachment to the propeller’s respective working surfaces, is detached. As the water detaches, the propeller’s loading is reduced, and the torque applied to the propeller through the shaft can more easily spin the propeller to a much higher rpm even at the same given power input. This, not only, causes the motor to rev easily, but it reduces the thrust provided by the propeller, slowing the boat’s speed and/or acceleration, as well as, reducing the propeller’s control over the boat (blow out on turning, on holeshot, etc.).

Specifically what happens in cavitation is this: Vapor gases evaporate into the cavity from the surrounding medium; thus, the cavity is not a perfect vacuum, but has a relatively low gas pressure. Such a low-pressure cavitation bubble in a liquid begins to collapse due to the higher pressure of the surrounding medium. As the bubble collapses, the pressure and temperature of the vapor within increases.

The bubble eventually collapses to a minute fraction of its original size, at which point the gas within dissipates into the surrounding liquid via a rather violent mechanism, which releases a significant amount of energy in the form of an acoustic shock wave and as visible light. At the point of total collapse, the temperature of the vapor within the bubble may be several thousand Kelvin, and the pressure several hundred atmospheres.

Cavitation can significantly damage moving parts, and is usually an undesirable phenomenon. It is specifically avoided in the correct design of props and that is why prop fabrication and prop repair must be relegated to the experts.

If you have questions about cavitation or need help with your propeller installations, contact the experts at ace propeller 1-866-799-7767

4 blade stainless

A word from the president

Prop Damage, Repair or Replace?

So, you looked at your prop and it isn’t looking so great. Should you repair or just replace it. Here are a few tips to help you decide.

First of all, was your prop doing a good job before it was damaged? It is critical that your prop can keep your motor in the proper rpm range. Failure to do this results in poor fuel economy, poor performance, and most expensive of all—potentially catastrophic damage to your motor. Second, did your boat accelerate and corner well? If there are issues with these items, it might be time to consult with a prop manufacturer or your propeller dealer and replace your prop. After all, a prop that is perfectly repaired, but is not properly suited for your application—is perfectly improper.

(Note: If you are experiencing noticeable vibration from the prop, you should immediately repair or replace the prop. Nothing good comes from vibration!)

However, if the basic performance factors were OK, we will need to evaluate the feasibility of repairing the prop.

If you have an aluminum prop, you should inspect for excessive metal loss, extended cracks, too thin blades, or cavitation burns. If you have more than 10% of your blade area missing, or other problems, it may be better to replace the prop. An additional consideration is whether your prop may need the inner hub that protects your drivetrain replaced. This can add another $40-60 to the repair cost, so it needs to be examined as well. Aluminum propellers are fairly inexpensive to purchase new, so you don’t want to put too much money into them, unless they are in pretty good overall condition.

What if you have a V drive or inboard ski boat/cruiser with bronze wheels? The critical issue here is blade thickness. Even if you made a “pretzel” out of your prop, skilled prop shops can work wonders. But, if the blades are excessively thin, you may be sinking money into a lost cause. When you straighten, you need to regrind to smooth the surface and remove dents/nicks. Each time this is done, critical metal thickness is lost. Remember that a 20% reduction in thickness may reduce the strength by up to 50%. These wheels are more expensive than aluminum, so if the thickness is OK, repair is a very cost-effective decision.

Stainless props need to be evaluated on similar criteria. First of all, is the remaining thickness OK? Any signs of cracks? How extensive is the damage? How much metal is missing? Generally speaking, stainless props are made from two general types of metals.High carbon stainless is very strong and damage resistant. It welds well and can generally be repaired unless it is bent excessively. Given its high strength, it does not like being bent into a pretzel and straightened. Typically this metal is used by Mercury, Yamaha, Turbo-Stiletto (now a Yamaha company), Michigan Wheel, and PowerTech. Another characteristic of high strength stainless is the fact that is shows more corrosion than low strength stainless. This is a natural consequence of the higher carbon steel content used in the alloy.

Low strength stainless uses more nickel in the alloying combination. This provides a significant increase in corrosion resistance, but also drops the tensile strength, typically by 50% compared to the high strength material. The material is more similar to that used for deck hardware. Since the strength of the material is more like bronze than a high strength stainless, it will “pretzel” pretty easily. The good news is that it can normally be straightened out again.

In either case, the issue will be to examine for enough blade thickness to allow the repair to be completed and still have sufficient “meat” left for durability.

If the decision is to repair the prop, look for a well-recommended repair shop. The proper repair of propellers is an art. It takes a true skilled technician to do the job you want. There are many good repair facilities available. If you have a prop shop that is doing a great job for you, stay with them. However, if you are looking for a shop, let me recommend the NMPA. We are members of the National Marine Propeller Association (https://www.nmpa.net), which provides training and workshops to help its members keep their technical skills current. It may be a good resource to assist you in finding a skilled prop shop. We also have a dealer list on our website www.ptprop.com.

In any case, let’s get your prop taken care of, so you can get out on the water and have some fun!

Steve Powers
President
PowerTech Propellers

The Difference between PowerTech Stainless Steel Boat Propellers and Piranha Composite Propellers

The Difference between PowerTech Stainless Steel Boat Propellers and Piranha Composite Propellers

PowerTech stainless steel boat propellers are among the fastest and strongest propellers on the market. These stainless steel propellers have been manufactured for over 34 years as a durable and secure propeller option.

Piranha composite propellers made in California, are a hybrid combination of strength and performance, making them an all-around, reliable propeller, that has been honored with the title of “best of props tested” by numerous magazines. Although not as strong or fast as PowerTech stainless steel propellers, they are a well-rounded option that is easily replaceable and very affordable.

Ace Propeller, a North American boat propeller specialist company that has been in business for over 20 years carries both the Powertech Stainless boat propellers and the Piranha propellers because each propeller has its own distinct set of advantages.

Powertech Stainless Boat Propellers

Powertech propellers have been widely manufactured and distributed since the 1980’s which has allowed them to grow and evolve with the boat propeller industry. Unsurpassed in their quality, each Powertech propeller is heavily invested in during the post-production effort to ensure leading edges are sharpened, the entire prop is detailed for material flaws, that blade height tolerances are verified, and that they are hand balanced.

Powertech stainless boat propellers are proven to be the fastest boat propellers, allowing for maximum performance. Because Powertech stainless propellers are also the strongest of all boat propellers, they do not require as much material, which means their blades can be thinner, allowing for the prop to turn easily within water. All unused horsepower is then applied to better performance shapes and heavier cupping.

The strength of stainless steel blades on Powertech propellers also means that they can easily cut underwater objects without damage and provide boat operators with more safety as well as peace of mind.

Piranha Composite Propellers

Piranha composite propellers were designed as an alternative to expensive stainless steel propellers and weak aluminum propellers. Piranha propellers are made of aluminum hub and advanced resin, nylon, and carbon fiber composite blades to ensure that the blades will not corrode or blister. If anything does happen, the piranha propellers come with a lifetime hub warranty, quick repair and repitch, and a factory direct blade exchange program.

Piranha composite propellers are also built with the latest technology in order to match the performance and reliability of stainless steel propellers, but at a lower cost.

Unlike stainless steel blades, Piranha propellers cannot always cut through underwater objects, many times the blades will absorb a hit, but even if the blades break, they are easy to replace within minutes. Even if a boat operator needs to replace three separate blades, the process is still cheaper than replacing a prop. This means, customers no longer have to constantly visit expensive propeller shops and can repair damaged blades on their own.

To learn more about the various boating propeller products such as the PowerTech stainless steel boat propellers and Piranha composite propellers made in California, visit Ace Propeller’s website at www.acepropeller.com.

Difference between 3 and 4 blades propeller

The most asked question at the boat shows is almost always” what is the difference between
a 3 blade and a 4 blade boat propeller” The difference between 3
blades over 4 blades is that the 3 blade (smaller blade ratio) usually goes
faster and the 4 blade (higher Blade ratio) is better hole shot and better
stern lift as well as better handling and fuel economy because it will keep you
on plane at a lower speed

If you look at a propeller from behind, and visualize a circle that the blade tips would draw, you will see that the blade of a 3 blade prop covers about 50 -55% of the circle. (This is called diameter area ratio, or DAR). You can add thrust within this drive circle by increasing that percent (to say 60 – 65%) by adding a 4th blade. When you look at a four blade prop you will notice that more of this area is covered because of the extra blade. That means more push contact with the water

Michigan wheel 3 blade aluminum propeller

Time for Boating springtime is here

The long awaited moment when we FINALLY get our boats out of winter storage (for those of us who do not live in southern states). Then we get busy with spring clean up and spring tune up on our boats to ready them for our first boating excursion! Don’t forget it is a great time to check the condition of your propeller, replace it if necessary and make sure you have a spare propeller in good condition. This is part of your safety equipment check and make sure you have all the necessary safety equipment on board and all is in good condition! At Ace propeller we have many options available from Piranha propellers with replaceable blade system, Powertech propellers offer aluminum as well as stainless props ,and of course Michigan wheel aluminum, bronze and Nibral propellers and even Solas aluminum propellers.

Have fun this spring and summer!

How much should I spend on a boat propeller

We advise boaters to spend as much as it takes to get the right propeller for their boating application. Don’t be too concerned with prop costs because the biggest bang that you can get for the buck, when it comes to boat performance, is with the propeller.

Remember that a slightly incorrect type or size of propeller can seriously reduce several aspects of your boat’s performance.

Of course this doesn’t mean you should spend money unnecessarily. We can help you understand a lot more about propellers and to make a decision as to which propeller could be best for your own boat.

You may want to know that propellers are always referred to by two numbers. The first number is the ‘diameter’, or straight line distance in inches, from a blade tip to the center of the of the hub, times two. The second number is the ‘pitch’, or theoretical distance in inches that the propeller would travel forward in one single revolution.

Ace propeller 1-866-799-7767

Powertech 3 blade stainless propeller

Best way to improve performance

First the best way to improve performance is with the correct prop. You can try all kinds of different props with different types of blades styles and cupping and diameter and weight in the boat and water and wind condition and you will always get a variety of results but the only way to know is by trial and error. Also in the marine industry weight is everything you will loose significant top speed as you add weight to the boat (fuel, passengers and cargo).

WOT (wide open throttle) RPM reading with current prop is the best way to know how we can improve your performance.

Many factors can reduce your RPM in many ways: upgrading to better materiel, increasing the diameter and/or pitch, upgrading to a 4 blade and cupping, just to name a few

The difference between 3 blades over 4 blades is that the 3 blade (smaller blade ratio) usually goes faster and the 4 blade (higher Blade ratio) is better hole shot and better stern lift as well as better handling and fuel economy because it will keep you on plane at a lower speed.
If we are talking performance; stainless steel propellers are the best followed by composite propellers and then aluminum. If you are not worried about hitting and damaging the prop; I strongly suggest investing in a Powertech stainless, the performance is an improvement on holeshot top speed and fuel economy. We can sell you some less expensive stainless but I do not recommend.

Your second best alternative is a composite propeller by Piranha. Piranha composite propellers are superior to any aluminum propeller. Piranha propellers were developed with three things in mind: durability, performance and affordability. A key feature is that the blades are replaceable. You can change the diameter and the pitch, save on the costs involved with propeller repairs, not to mention the potential damage to your gear case. With Piranha you can have some spare blades in the boat for a quick and affordable repair.

If you know your RPM reading at WOT send us a email at info@acepropeller.com and we will get back to you with a recommendation.

Denis
Ace Propeller

Denis and Kevin

Most asked questions about boat propeller

What is the difference between a 3 blade propeller and a 4 blade propeller?
What is pitch?
What do the numbers mean 15×17 ?
Does materiel matter ? Stainless? composite? aluminum ? bronze ? Nibral ?
What is RPM at WOT?
What is the best hub design ?
What does cupping do ?
Should I get my propeller repaired ?
How do I make my RPM go up or down ?
What causes cavitation ?
What causes prop wash ?
What is rake and what does it do?
How do I get more bow or stern lift ?
What cause purposing ?
Should I lower or raise my outboard on the transom ?
What is flex and yield ?
What will give me my best value?

These are most of the questions we get asked when we are at the boats shows…Please e-mail me at Denis@acepropeller.com
and I will be glade to answer any of questions for you

Denis Fournier
Ace propeller

Best wishes for a safe and happy holiday 2015!

Best wishes for a safe and happy holiday! Thank you for your patronage and look forward to serving you in 2016!
Safe and Happy Boating on your next outing on the water.

From your boat propeller expert team at Ace Propeller Team!

Piranha propeller prokit

Piranha propeller propulsion kit

Propulsion Kits

Propulsion kits are available for all applications.

While many boaters are familiar with the bodies of water they frequent, they can’t predict when they may hit a submerged object. In the unfortunate event that a boater does suffer an impact, a back-up plan is sure to prevent down time, a ruined day on the water, and a lot of frustration. With this in mind, Piranha created the Propulsion Kit. This kit is designed to give a boater the security of a reserve prop, along with the tools needed to fix the problem. The modular design allows the spare blades and tools to be stored easily, and make changing damage blades a simple 5 minute task. Customers also save 10% by purchasing as a kit.

Propulsion Kits Include:

A complete Piranha Propeller
A complete set of spare blades
A Piranha Propellers floating propwrench
Mesh storage bag

powertech propeller

Help selecting boat propellers

We can help you select the correct propeller the more info we know the more accurate our recommendation

Motor type and manufacturer
Year and horsepower of motor
Length and type of boat
Any current prop info will help. Diameter, pitch and type of material
WOT (wide open throttle) RPM reading with current prop is the best way to know how we can improve your performance
WOT (wide open throttle) RPM reading with current prop if you can answer some or all of the prop info

Also what kind of boating do you do most often. Watersports…cruising ..top speed ?

We will then be able to help you with a more accurate recommendation.

piranha 3 blade

Piranha propeller warranty

Warranty Information

30-day Money Back Guarantee

All new Piranha Propellers feature a 30-day guarantee. This gives you the opportunity to experience what Piranha has to offer, without the risk of getting stuck with a propeller that doesn’t work right. Most propeller manufacturers won’t take a prop back after you’ve tried it, but unfortunately no matter what prop size / type you buy, there’s no way to precisely predict how it is going to perform on your actual boat. Piranha knows this and offers you the assurance that if they can’t make it right, you won’t be stuck with it.

If you are not satisfied with your new Piranha, you may return it for a refund. Refunds do not include the original or return shipping costs. In addition the prop must be in re-sellable condition. Please keep this in mind when you get your new prop. Test your new prop in familiar waters where there is low risk of the prop contacting foreign objects. Hitting or scraping something with the prop probably won’t make it unuseable, but it also won’t leave it looking as it did when new and thus not-returnable. Finally, if you wish to paint or coat your prop with red laquer or anti-fouling paint, please do so AFTER deciding to keep the prop. Piranha will decline your refund request if you return a red prop to them.

Lifetime Hub Warranty

The heart of a Piranha Propeller is the aluminum cored center hub. This part features a lifetime guarantee. If you damage it for any reason, Piranha will replace it for you (shipping charges not included). Propeller blades on the other hand are not warranteed except for manufacturing defects. They are designed to break under significant impact to protect your gearcase.

Arranging a Return

If you need to arrange a return, please contact the factory. Please include your full name (as it appeared on the order), the order number, and the items you want a refund on. We can then get an RMA (Return Merchandise Authorization) number generated for you. You must write this number on the outside of the package you will be returning to the order processing center. Returning items without an RMA number may prevent or delay the processing of your return. You may also request an RMA number by calling 866-799-7767 and leaving a message. Again, please leave your full name (as it appeared on the order), the order number, and the items you want a refund on. The order processing center will give you a call back once they’ve generated an RMA number for you.

Powertech Pontoon boat propeller

Stopping Power for Pontoon Boats

By pulling a design ridge back from the leading edge of the blades, designers of PowerTech!’s PowerStop prop were able to achieve the stopping power needed for large pontoon boats without seriously harming the forward performance.

Designing a prop that will drive pontoon boats and other large, high-windage rigs efficiently, and yet still stop them quickly, has long been a challenge for prop makers. PowerTech! appears to have an answer in the PowerStop Series, which is said to stop these bulky craft as much as 87% quicker than conventional props. PowerTech!’s solution is to fair cupping into the underside of the leading blade edges and create an aft tapered cup in the top of the trailing edge. These two cups on opposite sides of the blade grip the water and give better control whether going forward or backward

ask for the Powerstop propeller by powertech available at Ace propeller 1-866-799-7767

4 blade stainless

Powertech 4 blade props

…To Four, or Not To Four…That is the Question

For many years, now, boaters have debated the question of 4-blade propellers versus 3-blades. The traditional argument is that 4-blades are slow and 3-blades are fast, end of discussion. Today, new trends in the marine marketplace, higher fuel prices, challenging economic times, and the like have all brought new concerns to the boating world. Speed is, now, a much smaller part of the equation; while practical, real world performance becomes the consumers primary concern. In this new modern age, the question arises anew, but this time, with a different answer.

MYTH vs. LEGEND

In the beginning, the idea that 4-blades were slower than 3-blades was true to a certain extent, but that is because many of those 4-blades were not designed with speed in mind. Instead, the few designs that were available were intended to cure handling issues such as ventilation, cornering blowout, motor elevation requirements, and holeshot issues. Without many options in blade design, and very few of them truly intended to be particularly fast, the 4-blade got branded as slow, while their other performance benefits were largely dismissed. By contrast, today’s 4-blade propeller designs have evolved into, both, all-purpose and highly specialized geometries. These propellers can be tailored to, not only, address those traditional handling issues, but can also be tailored to improve a boat’s performance envelope, which can, in some cases, even include speed.

THE HOW AND THE WHY

The increased blade area afforded by the addition of the fourth blade can provide increased water displacement capability, lift, and grip, as compared to the comparable 3-blade propeller. In terms of actual boat performance, these characteristics can combine to enhance handling, holeshot, low-speed planning ability, cruise efficiency, fuel efficiency, load-carrying performance, big seas performance, following seas/down current performance, ventilation/cavitation resistance, motor elevation capability, etc. In short, a 4-blade propeller can improve all those characteristics that make for practical, all-around boat performance.

So, why might a 4-blade generally be slower than its 3-blade counterpart? To be honest, many 3-blade/4-blade speed comparisons are simply not fair. That’s because the respective propellers in question are simply different styles, designed with different purposes in mind—different diameters, rakes, cupping, and blade shapes. If, however, for comparison purposes, we take two propellers, identical in design (blade shape, diameter, rake, cup, etc.) that is appropriate for a given application, and simply add a propeller blade, we get a truer representation of just where the difference lies. The addition of the extra blade causes increased drag, which, in turn, requires more horsepower, in order to achieve the same rpm. Since the horsepower is limited, the rpms drop, and the speed will tend to drop with it. This is why, when going from a 3-blade to a 4-blade, the pitch is dropped an inch, or more, in order to keep rpm parity. It is this difference in pitch that causes any potential speed differential between the 3-blade and the 4.

As to any actual speed loss between the two, in many cases, it is actually quite small (generally 1-3 mph). The reason is, although the 4-blade is one-inch lower in pitch, it runs more efficiently than its 3-blade competitor, allowing it to run closer to its theoretical speed than the 3-blade, thereby, effectively closing the gap presented by the pitch differential.

TRENDY 4-BLADES

As the result of many of today’s trends in the marine marketplace, 4-blade propellers have become more popular than ever. As fuel prices have risen, fuel efficiency and cruise efficiency have become prime concerns for boaters, and 4-blades can offer improvements to both. Other trends in the marine industry, such as, the move toward 4-stroke motors with their heavier weights and higher numerical gear ratios, shallow-flats boats, tunnel boats and cat boats with their ventilation-prone running characteristics, ski-boats with their pulling requirements, heavier deep-V offshores with their big seas control requirements, can all benefit from the additional grip, lift, and efficiency of 4-blade propellers. In short, 4-blade propellers have become almost indispensable in maximizing boat performance and customer satisfaction.

Where customers were once resistant to the idea of a 4-blade propeller, we are actually finding that customers come to us asking if their applications will benefit from the use of a 4-blade propeller. In many of these cases, the answer is a resounding, “yes.”

DESIGNING THE SOLUTION

As we have learned more about what makes a propeller work and not work, and about how boats and motors perform and do not perform, we have designed propellers that address the inherent strengths AND weaknesses of each of these respective pieces of the puzzle. These designs have become even more important as more and more specialized boat designs and motor trends have entered the marketplace and as new trends and economic challenges arise. All that said, the most important part of the equation remains the customer’s performance expectation and satisfaction; so, the goal is to match the propeller to the boat, motor, AND the customer’s needs…as always, the right tool for the right job.

Marcus Clements

Piranha composite propellers is going all hydrobite

Propelled to success

Long fiber tough enough for interchangeable propeller blades

A holiday conversation between Brad Stahl and his brother led to the development of an innovative motorboat propeller designed to reduce the cost of damage from strikes with underwater obstacles by employing interchangeable blades and a new material to replace metal.

At the time, Stahl was an aerospace engineer working on designing propeller systems for unmanned aerial vehicles (UAV) who had begun working with long fiber reinforced thermoplastic composites.

As his brother, a motorboat enthusiast, told stories of damaged propellers and the expense of replacement, Stahl knew he could translate his work with UAVs to motorboats and provide an alternative to one-piece solid aluminum and stainless steel props.

Interchangeable Design

Piranha motorboat propeller made from long fiber compositePiranha’s unique composite propeller design consists of a center hub with three or four slots for inserting interchangeable blades of varying size and pitch.

Easily changing a damaged or broken blade instead of the entire prop lowers ownership cost; interchangeability also allows tuning of propulsion thrust to meet a boats intended use, for either speed or transporting loads.

When a metal propeller blade strikes a submersed obstacle, it can permanently bend or break, with severe impact forces often causing additional costly damage to the motors lower unit.

With a Piranha composite propeller, the blades flex and absorb the energy from minor impacts. At higher impacts, the blades, which have lower shear strength than metal, sacrifice themselves by breaking and releasing energy before transferring damaging forces to the motors lower unit.

Lower unit repairs can cost up to several thousand dollars, making a $25 composite replacement blade a considerable cost saver, according to Stahl.

Long Fiber Composites

Stahl’s first propeller designs used a 60% long glass fiber reinforced nylon 6 composite and testing on higher horsepower motors was successful. “When I dropped back to lower horsepower two-stroke motors, we started seeing failures,” he said. “It came down to higher harmonics and vibration in the two-stroke motors.”

The solution was adding a toughening agent to the long fiber composite that better dampened vibration energy, according to Stahl.

“You really have to understand the flexural modulus properties of long fiber composites when designing a propeller,” said Stahl. “Our designs have to be slightly distorted when molded so that in use, when the blade is experiencing propulsion forces, it has the proper shape to maximize thrust.”

Maximum Toughness

Today, Piranha uses a Complēt® MT series long glass fiber reinforced nylon 6 composite from PlastiComp for its propellers. PlastiComp formulated its Complēt MT composites for maximum toughness to provide up to 40% more impact resistance than standard long fiber reinforced materials. The extra durability provided by Complēt MT long fiber composites makes them ideal for demanding applications like Piranha’s propellers.

“I originally started working with PlastiComp because I was looking for a second material source – they quickly became my primary source,” said Stahl. “Other long fiber materials I tried looked bad when molded. Complēt MT easily provided the surface finish I wanted for our propellers.”

“I really enjoy the relationship we have with PlastiComp,” he said. “Every time I have a question PlastiComp is right on the ball.”

Hydrothrust Propeller

Piranha’s latest propeller iteration for houseboat and service barges improves reverse thrust. “When the wind kicks up, a houseboat can quickly become difficult to maneuver,” said Stahl. “We do a lot of sales to the rental market and it doesn’t take much for inexperienced people to have difficulty because reverse thrust performance is significantly lower. Propellers are designed to push, not pull.”

Piranha interchangable propeller blade made of long fiber compositeThe innovative blade design of Piranha’s Hydrothrust propeller provides 400% more reverse thrust than standard propellers and twice as much as competing metal props. “Our Hydrothrust propeller produced 650 pounds of thrust in reverse with virtually no change in forward performance,” said Stahl.

“Whether backing a houseboat off a beach or maneuvering around docks, especially when there is wind in the picture, Hydrothrust provides a real boost in safety by increasing controllability,” he said.

Other enhancements Piranha is able to offer include Hydrobites, small flow fences on propeller blades that control water flow and reduce turbulence vibration. “Injection molding with long fiber composites makes it easy to add feature details like our Hydrobites that would be difficult and expensive to produce in metal,” said Stahl.

Piranha Propellers, based in Jackson, California, is the leader in composite marine propellers serving the recreational boating market with propellers for all major brands of outboard and inboard motors.

powertech propeller

The most highly engineered stainless props available

PowerTech! Stainless Steel Propellers are cast in one integral piece in a ceramic mold. This process is an advancement that is used by all engine manufacturers in addition to a few leading propeller manufacturers. The extra expense associated with this process justified by the improved and superior quality of the final product when compared to the less expensive “weld-on blade” process. PowerTech! Is committed to providing boaters the most highly engineered stainless props available and is constantly seeking to improve designs and materials to meet the ever changing demands of the industry.

For more detailed information on individual props, please contact one of the experts by phone at 1-866-799-7767

Michigan wheel 4 blade aluminium propeller

We help you choose the best props

Finding the right prop for your application is not as easy as you may think. In fact, it is our experience that proper prop selection is one of the most difficult tasks in boating to make sure you are getting optimum performance. Mistakes can be costly in terms of fuel consumption, drive train wear, prop longevity and speed. The right pitch and diameter is not the end of it, but rather just the beginning of the process. There are numerous other aspects to prop selection including rake, cup, surface area, material and the number of blades.
We at Ace propeller can help you choose the best prop for your application.