RICH Good question. I consulted with both the engine manufacturer and the Martec guy who went back and forth in a range and we settled on this. The Martec guy actually wanted me to swing a larger diameter prop with slightly less pitch but short of moving the strut, that wasn't going to happen.
The history of this install is that it was preceded by an install of an EYI identical engine into a 1974 CC 35-ii which I got to see in action and that owner stuck with his existing prop which was originally powered by an ATOMIC 4 and even though adjustments in gearing could be made on the electric, it was felt from that experience that a coarser pitch was desirable. There was a lot of discussion on slippage, true torque values etc. so we'll see if we over-engineered it, or hit a sweet spot. The natural operating range of the EYI is around 1400 RPM and as an electrical engineer, you can understand the spectrum of torque characteristics of an electric is different from an internal combustion engine (ICE), so we'll see. I am still keeping my 14x6 in case we are geared too far up. It's like the diesel electrics of locomotive technology or electric street cars or subways or trains. There is a lot more torque at the low RPM end than with an ICE. How that is going to affect reverse, is going to be interesting. Then again, I'm old fashioned, the only reason I even have an engine is to reduce the anxiety of my club friends. I normally don't like to go backwards in a boat, but with modern yards, it is a necessity, so we'll set up the GO PRO for the sea trials.... Cheers! Alex ______________________________ Alexander M. Giannelia, B.A.A. President THE AIRBORNE SENSING CORPORATION 912-555 Richmond Street West P.O. Box 1008 TORONTO, Ontario CANADA, M5V 3B1 Office: +1(416) 203-9858 Fax: +1(416) 203-9843 Mobile: +1(416) 529-0070 a...@airsensing.com www.airsensing.com
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