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Discussion Starter · #1 ·
My prop is worn down on my baby cat and its is time for a new one. I definately am getting a three blade just not sure what pitch to get. I'm guna go see Donny and test out props but wanted some opinions and numbers from yall.
 

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Talk to Loui Bauman. Nothing against Donny or any other dealer but they buy their props in bulk. Talk to Louie and have him build you a prop that is suited for your boat. I promise it will make a HUGE difference.
 

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JimD
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I had Louie take my P T 15 redo the rake, add cup and the prop runs great short of a new one. We got 39.4 Sunday week quartering the wind and jumps two people well.

What prop did you wear out?

Nate on the board has 05 Etec BC with Baumann 4 blade that is still better than most props that I have seen. Jumps up about anywhere and still get 38 after 500 hours and not much cup left on the prop.

Talk with Louie and see what he says.


Received this from Louie Baumann Jim,
we have 3 different propellers you can test run.
2 are 4 blades and 1 is a 3 blade.
We have had success putting the 3 blade on smaller boats and they ran well.
But we will let you make your own determination since everyone wants their boats to do specific things.
All we need is for you to run a credit card number for the cost of the propeller and it will be credited back upon return.
Louie Baumann
 

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I had Louie take my P T 15 redo the rake, add cup and the prop runs great short of a new one. We got 39.4 Sunday week quartering the wind and jumps two people well.

What prop did you wear out?

Nate on the board has 05 Etec BC with Baumann 4 blade that is still better than most props that I have seen. Jumps up about anywhere and still get 38 after 500 hours and not much cup left on the prop.

Talk with Louie and see what he says.

Received this from Louie Baumann Jim,
we have 3 different propellers you can test run.
2 are 4 blades and 1 is a 3 blade.
We have had success putting the 3 blade on smaller boats and they ran well.
But we will let you make your own determination since everyone wants their boats to do specific things.
All we need is for you to run a credit card number for the cost of the propeller and it will be credited back upon return.
Louie Baumann
Made the trip from Austin just to talk to Louie. I'm gonna ship him my prop. He guaranteed my hole shot won't get worse and I'll pick up 3 to 4 mph. If it doesn't work out I'm blaming you Jim ... kidding of course ;-)
 

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Talk to Loui Bauman. Nothing against Donny or any other dealer but they buy their props in bulk. Talk to Louie and have him build you a prop that is suited for your boat. I promise it will make a HUGE difference.
Yep, talked tp Baumann at the boat show today, that will be my next investment
 

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JimD
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7,161 Posts
NW,

You are free on Monday's why not go down and demo all three props and post up what you find?

Louie tells me his 3 blade will do as well as his2 4 blades.

I was planning a fishing trip with Nate this evening and he is still swearing his BC's 4 blade prop was still better than most on Hole shot and speed.

A25- Depending- Louie rebuilds props too if you wanted your prop blades redone.
 

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From Hope and Change 2 Dope and Strange
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I talked to him at the show Sunday. I believe in his 3 blade flats blaster prop. I have used them on my last 3 boats. Great people also.
 

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Discussion Starter · #8 ·
On average what does louie charge to redo a prop.....also how much is the 3 blade prop he has running?
 

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JimD
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http://www.baumannprops.com/pricelist.htm

Call him after he survives the boat show. You can drop him an email but I found one was out of date and not sure if it was working now.

He has a lot of different prices on what you want done, type of prop and size and how bad you trashed the old one. NOt sure on what the 3 blade runs but know it is less than 4 blade. Think that Nate from Victoria got his Baumann prop from Rick at Cresta's?? in 05.

What is your old prop? 15 pitch? Power tech Stainless is what Donny is putting on a lot of the boats now. I think I paid under 100$ to get my PT reworked for my BC.

If he can rework the old one it might make a great spare if you believe in carrying one.

Talk with him he is a knowledgeable person.

See article below on props if you are not that familiar with the terms. Did not know what he was talking about the first time.

Boat Props 101
Understanding your Propeller by Caravelle at http://www.caravelleboats.com/2007/pick.html
if more information is needed

Identifying your propeller

The size of a prop is described using two sets of numbers. (e.g. 14 X 19) The first number designates the diameter, and the second number designates the propeller pitch.

Propeller Terminology

Diameter
Diameter is the width of the circle described by the rotating blades.
Pitch

Pitch is the theoretical distance a prop moves forward in one revolution. The following propeller has a pitch that will theoretically result in 24" of forward travel in one revolution. However, in the real world, the propeller experiences "slippage" so that its actual travel per revolution is less than the stated pitch.
Prop pitch is frequently misunderstood. Many people mistakenly believe that switching to a larger pitch prop will make the boat go faster. If a prop with too large a pitch is used, the motor simply doesn't have enough horsepower to turn the prop adequately and the RPM level drops. Not only does the boat go slower, but the motor can load up and the plugs become fouled. If a prop with too low a pitch is used the prop can exceed the manufacturers recommended RPM level and damage the engine.
The ideal situation is to select a prop with a pitch that allows the motor to reach the maximum RPM suggested by the engine manufacturer without going over. If the prop selected doesn't reach the recommended RPM level, the boat will sacrifice speed and lift.
Here's a simple rule of thumb to follow when experimenting with prop pitch. Remember that at wide-open RPM increasing the prop pitch reduces RPM levels by roughly 200 rpm's per inch of pitch. In other words, when switching from a 23- to a 25-pitch prop, the maximum RPM level will drop approximately 400 rpm's. The reverse is true when going down in pitch size.
Propeller Cup
Many of today's propellers incorporate a cup at the trailing edge of the propeller blade. This curved lip on the propeller allows it to get a better bite on the water. This results in reduced ventilation, slipping, and allows for a better hole shot in many cases. A cupped propeller also works very well where the motor can be trimmed so that the propeller is near the surface of the water. The cup will typically result in higher top end speed on one of these applications.
Switching from an un-cupped to a cupped propeller will reduce your RPM. The actual amount of RPM decrease is dependent on where, how much, and the quality of the cupping. Typically, a cupped propeller of the same pitch and diameter will reduce your RPM by approximately 200.

Ventilation
Air from the water surface or exhaust gases from the exhaust outlet being drawn into the prop blades causes ventilation. When this situation occurs, boat speed is lost and engine RPM climbs rapidly. This occurs most often with high transom mounting, over-trimming the engine, or sharp turns.
Cavitation
Cavitation (often confused with ventilation), is a phenomena of water vaporizing or "boiling" due to the extreme reduction of pressure on the back of the propeller blade. Many propellers partially cavitate during normal operation, but excessive cavitation can result in metal erosion or "cavitation burn" to the prop's blade surface. There are numerous causes of cavitation such as incorrect matching of prop style to application, incorrect pitch, damage to the blade edges, etc.

Rake
Rake
is the measurement of the angle of the tilt of the blade's tip toward or away from the gearcase. The angle is measured on a line extending from the center of the hub through the center of one blade.
Selecting the right propeller

The best propeller size for your boat and engine combination is based on the recommended operating range at wide open throttle (w.o.t.) for your engine, which you will find in your engine operator's manual.
The goal in prop selection is to determine what propeller style and size will maximize performance for your boat, while allowing your engine to operate in the recommended RPM range. The correct propeller will prevent the engine from over-revving, yet allow it to reach the minimum RPM where maximum horsepower is produced.

Run the boat/motor at w.o.t. under normal operating load to determine the maximum RPM you are able to obtain. Adjust the motor trim angle for the optimum performance. If during this test, you begin to exceed the maximum rated RPM of the engine, reduce throttle setting to a position where maximum RPM is not exceeded.

If your test results in your being able to over-rev the engine, you need to increase the pitch of the propeller. Increasing the pitch increment by 1" will result in approximately a 200 RPM drop. If your testing shows, however, that you are only able to obtain a RPM somewhat lower than the maximum rating given by your engine manufacturer, you would need to decrease pitch. Decreasing pitch would increase your RPM. Once your wide open throttle RPM falls within the recommended range of the engine manufacturer, you have a propeller that is suited correctly for your boat with respect to RPM.

If you use your boat for fishing, cruising and skiing, one prop probably won't do all three things equally well. It is best in circumstances like this to have two propellers; One to accommodate one set of circumstances and the other to perform best under the different load. It is imperative, however, that the wide open throttle RPM fall within the range specified by your engine manufacturer.

Aluminum or Stainless?
Aluminum props are the ideal choice for small- to medium-sized boats and motors. Available up to 23 pitch, aluminum props are also the logical choice for use in areas where prop damage comes with the territory. The average aluminum prop costs about $150 compared to $400-$500 for stainless propellers.
Stainless steel props are more expensive, but they offer several advantages. They deliver more performance and are available in larger pitch sizes. One reason stainless props provide more performance than similar pitch aluminum models is because the steel blades are rigid and they don't flex under power. The blades on an aluminum prop actually bend when the prop is in use, reducing the overall size of the prop by approximately one pitch size. Stainless props also provide increased bow lift, especially on heavy boats. The more bow lift a prop provides, the faster and smoother the boat will ride at high speed and in rough water.
Three-Blade, Four-Blade, or Five-Blade?
Propellers are available in three-blade, four-blade and five-blade models. Multiple blade props came on the scene in response to high horsepower outboards that are typically mounted higher on the transom than smaller motors. Because the prop runs closer to the surface, the extra blades help to provide bite and stability at high speed
The advantages of props with extra blades are they provide quicker take-offs, and allow the boat to be kept on plane with fewer engine rpm's. However, they are slower at top-end speeds. A quality three-blade prop is normally two or three miles per hour faster at top end than the same pitch prop featuring multiple blades.
Maintenance

Check your propeller often for nicks, rolled tips, or bent blades. Any distortion from normal will cause a loss in performance and can create vibrations harmful to the engine. A propeller with worn blades will allow the engine to accelerate beyond the recommended operating range which can result in damage to the engine.
Keep the bottom of the boat clean. A fouled bottom, an accumulation of marine growth, moss and barnacles in sea water, and the accumulation of dirt, slime, lime, and other matter in fresh water, is the major cause of poor boat performance. Cleaning the boat's bottom frequently during your boating season will greatly improve boat performance.
Things to Remember

1. Engine RPM at W.O.T. must be within the recommended operating range with the rated horsepower RPM as the target number (see specification in your engine operator's manual).
2. Increasing or decreasing prop pitch directly affects engine load throughout its RPM range.
3. Trim angle affects propeller performance.
4. Atmospheric pressure, elevation, temperature, and humidity all affect engine performance, which directly affects propeller performance.
5. Salt water is more buoyant than fresh water; this may cause some hulls to run faster than identical freshwater setups.
6. Water conditions can play a big part in boat performance and propeller efficiency.
7.The boat's load and position of the load can significantly affect performance.
 

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Louie sure did me a great job on my 3 blade prop , Honda 90 on a 15' Shallow Sport, if I am really shallow , ya better get a grip on somehting !
 
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