Prop Size for a 2760

[BayBum37ft]

I have a 2000 2760 with twin Volvo 4.3 GLs(190 HP) and SX drives and the boat came with 14.25" X 19" stainless props with a cup,from Michigan Wheel- Raptures. And they seem to be a bit over propped, max RPM is 4200. I also need to switch to aluminum props because of a slight electrolysis corrosion issue. If anyone knows their prop size, it would be a big help. I e-mailed Michigan Wheel and since they do not make counter-rotating aluminum props they were no help.
Thanks

Greg

 

[David M]

quote:

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Originally posted by BayBum37ft

I have a 2000 2760 with twin Volvo 4.3 GLs(190 HP) and SX drives and the boat came with 14.25" X 19" stainless props with a cup,from Michigan Wheel- Raptures. And they seem to be a bit over propped, max RPM is 4200. I also need to switch to aluminum props because of a slight electrolysis corrosion issue. If anyone knows their prop size, it would be a big help. I e-mailed Michigan Wheel and since they do not make counter-rotating aluminum props they were no help.
Thanks

Greg

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I had the same problem with my 2465.

The cup adds pitch so depending on the amount of cup, you may actually be spinning a theoretical 20 inches or more. If you can find out how much pitch the cup adds it will make finding a the correct prop a lot easier.

I chose to go with a Piranha composite prop and went from 3 blades to 4 for the added lift and to reduce vibration. I believe my final choice was a 14.5 X 16" prop. A lot of very simple math and pure luck allowed me to get it right the first time. The boat went from a 3900 WOT to 5000.

I liked the prop for several reasons. Composite yields no electrolysis. The blades are interchangeable so when you smack something hard enough, you can change a blade on the spot at $22 a pop instead of replacing an entire prop. They (Piranha) were going to let me experiment with blades until I got it dialed in correctly. Again, I'm lucky I hit it correct the first time, but the fact they were willing to work with me meant a lot.

HTH

 

[vic33004]

BayBum;

the best source for info on prop size is customer service at Michigan, they are top shelf. you'll need specific info for them, waterline lenght, beam, wet weight of the boat, Hp and gear reduction ratio, along with accurate RPMs at WOT and what your rated WOT RPM's should be. they will help you select a better prop size based on your goals.

if you have electrolisis problems, first look to eliminate the source of the problem rather than make the prop the sacrficial metal. if the S/S wheels are getting eaten, you need to fix this before you go to aluim or you will go thru wheels even faster. I reccomend a galvanic survey from a qualified marine electrician. if he/she does'nt know what a galvanic survey is, keep looking.