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Actually I had a 135 Evinrude that did the same thing when I went to a stainless prop the rpms on that dropped from 5600 to 4400 and the speed went down slightly. It provides faster acceleration an average of 2 to 3 knots more than other alloys.
On a 150 hp a stainless prop will definitely make a difference in performance.
Will a stainless steel prop increase speed. A stainless steel prop will certainly increase the speed of your boat. It provides faster acceleration an average of 2 to 3 knots more than other alloys. It gives better control and less flex at top speeds.
As a rule a stainless-steel prop assuming the correct pitch and diameter will make your boat go faster up to 2-3 knots on some boats. Stainless steel is stronger and can be made thinner allowing more speed. Stainless steel propellers provide better mileage than aluminum propellers possibly more than a composite depending on blade foil design The stainless steel propeller provides more speed but in this horsepowersizeRPM range only 2 3 MPH more.
A stainless steel prop will increase the speed of your boat. In tests the speed can increase a 3-4 mph on a 150 hp outboard motor. This is significant in the boating world as it will.
As a rule a stainless-steel prop assuming the correct pitch and diameter will make your boat go faster up to 2-3 knots on some boats. Stainless steel is stronger and can be made thinner allowing more speed. A doel-fin and stainless prop probably would help.
Unless you have a tach I would be carefull playing around with props. Not sure what that motor should turn wide open but it should be proped to run there. Increasing prop pitch will lower rpm decreasing pitch will increase rpm.
If you have a tach what are you turning wide open. If those two assumptions are true then changing to stainless steel construction may not create more performance. However there is another consideration.
The sophistication of the design. In general the propellers made of aluminum tend to be rather basic and general purpose designs and it may very well be found that due to the more sophisticated designs used in stainless steel propellers you can improve. Feb 5 2011.
Switching from aluminum to stainless steel prop. Manufacturers suggested WOT is 4500-4800 rpm. I have never ran open throttle fearing Id damage an engine.
Ive only had up to 3500 rmp max. Ive only put about 13 hours on the engines since Ive had the boat one season. Go up one pitch depending how I use it because SS has no flex.
If present RPMs are 5300 to 5500 stay with 17 pitch SS prop but if RPMs are higher then 5500 drop down one pitch I dont know my RPMs but will check it next time I am out with the boat So help me out as to what pitch to go to on a SS prop. Imagine missing some good waves because of the material of your propeller. Stainless-steel is a lot more efficient and they have significantly less flex which then provides a better top-end speed.
Because of these reasons I believe that steel propellers are the ideal choice for watersports. Aluminum vs SS Prop. If you are running an aluminum prop changing to even a basic stainless steel prop will usually improve top speed.
Because stainless steel is stronger than aluminum the blades on a stainless prop can be thinner which reduces drag in the water. Those blades will also not flex under load like those of an aluminum prop and so will maintain. Stainless steel may look good but unless your in salt water and want to corrosion resistance I personally would stay with an aluminum prop.
If I did have a SS and hit something and my prop was still good. That energy was just absorbed by my leg and not my prop I would rather pay 200 for a new prop vs big for leg repair or replacement. Change pitch on stainless steel prop.
Actually I had a 135 Evinrude that did the same thing when I went to a stainless prop the rpms on that dropped from 5600 to 4400 and the speed went down slightly. I have two aluminum props Ive used on my current boat and they perform the same each with 17 pitch. As a rule a stainless-steel prop assuming the correct pitch and diameter will make your boat go faster up to 2-3 knots on some boats.
Stainless steel is stronger and can be made thinner allowing more speed. If the motors RPM is below the manufacturers range the boat is over-propped and decreasing the propeller pitch will increase the RPM to where it should be. Adjusting Pitch for Performance Propeller pitch also affects the high- and low-speed characteristics of a boat which can help fine-tune the performance a boat for a particular use.
I am interested in upgrading my prop from Aluminum to Stainless Steel to enhance the performance of my boat a little bit. Im surprised that there isnt more information on line about how to recalculate the pitch. My current specs are as follows.
I have a 1972 Formula 233 cuddy. My boat is about 5000 to 5200 pounds loaded. January 5 2019 at 330 pm 1823315.
On a 150 hp a stainless prop will definitely make a difference in performance. An aluminum prop will run just fine but there will be flex in the blades. A stainless will hold its pitch no matter the speed.
A good combo is a 19 pitch Tempest Plus. Powertech OFS4 Smooth and efficient – though expensive – this propeller has a thru-hub exhaust system which allows emissions to pass through a specially designed barrel instead of coming into contact with the blades. In larger boats this can help increase top speed and avoid blade corrosion.
Thinner blades create less drag in the water. The result is a higher level of performance from an aluminum prop for sterndrive and outboard engines up to 250hp and top speeds up to 50 mph. The properties of stainless steel result in a propeller that offers more performance and more durability than an aluminum prop.