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post #13 of Old 04-25-2013 Thread Starter
Join Date: Jul 2011
Location: Chino Hills, CA
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Re: Islander 28 propeller location from shaft support?

Thanks for putting out your input and questions dacap06.

You are correct, I'm looking for an approximation to have an idea about the propeller size before going to a shop. I really don't trust "experts", when it comes to sales, I tried to be some what informed. I then will be prepared with answer question the shop might have, shows I'm informed, and hopefully not an easy mark for buying something expensive I don't need.

So, I have an AC motor, 48v system, and the motor 100 amp max, 3.5 kw, 5 HP at the shaft.
I kinda thought the propeller size would be a 12 diameter, 3 blade. I'm just wondering about what pitch to get. I did get a guy who told me 80% of the propeller diameter, not sure if the rule is for electric, diesel, or gas. Based on that fact, I would use a 12x10, 3 blade.

I got it in my head from some where, the the hull to blade clearance was to close with the 13 diameter, causing some turbulence and noise issues on the Islander 28.

Thanks for the help
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