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Group,
I ask PYI about the appropriate size and pitch for a Max-Prop to install on my BCC "Crystal Swan II".
I have a Yanmar 3GM30F with a 2.61:1 transmission. My current prop is 16 x 11 (2 blade, fixed).
I told them I wanted the 3 bladed classic Max-Prop.
Here is PYI's recommendation:
First Response:
Thank you for your interest in the Max-Prop feathering propeller for your
Bristol Channel Cutter. From the information that you provided following is my recommendation. 2 Blade 16" diameter by 11" pitch for a 1" shaft $1420.00 3 Blade 15" diameter by 10" pitch for a 1" shaft $2120.00 With regards to performance, both two and three blade propellers will power the boat well in flat water. The three blade has a major advantage when going against heavy winds and seas the three blade will keep boat speed by up to 30% better than the two blade. Please feel free to contact me if you have any further questions or if you would like to place an order. Sincerely, Fred Hutchison / PYI Inc. 12532 Beverly Park Rd. Lynnwood, WA 98037 USA e-mail: hutch@pyiinc.com web site: http://www.pyiinc.com Tel: 425-355-3669 800-523-7558 Fax: 425-355-3661 Response to question about 15 v.s. 16 " Dia. Dear Mr. Osoborne,
Thank you for your e-mail. We have installed 16" 3 Blade propellers on the Bristol Channel Cutter, but never with a 11" pitch. A 16x11 3 blade propeller would not allow the engine to attain its full Rpm. I believe the final setting with the 16" was 9" pitch. This would match the loading of the engine with the 16x11 2 blade currently on the boat. The disadvantage of using a 16" 3 Blade is that the initial pitch setting is very low and that give you very little room to adjust the propeller pitch downward and still have an efficient propeller. In contrast with the 15" set at 10" pitch you will still have room to decrease the pitch if needed. Basically, either 15 or 16" propeller will work well to power the boat, the 15" just gives you more flexibility to adjust the pitch. Please feel free to contact me if you have any questions. Sincerely, Fred Hutchison / PYI Inc. 12532 Beverly Park Rd. Lynnwood, WA 98037 USA e-mail: hutch@pyiinc.com web site: http://www.pyiinc.com Tel: 425-355-3669 800-523-7558 Fax: 425-355-3661 |