T-Pain Is On A Boat: Re: [Electric Boats] New to group - Can I use regen with a folding/feathering prop

Sunday, January 31, 2016

Re: [Electric Boats] New to group - Can I use regen with a folding/feathering prop

I was wondering if the autoprop would give a bit better performance than a standard prop with the same size and pitch specs

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Some, if not all, feathering propellers in reverse it will stay in reverse until it is placed in forward and will only feather out of forward.

If the propeller is locked in reverse then it will regenerate.

Since a feathering propeller has flat blades without cupping it is more than likely to regenerate at higher efficiencies than a fixed propeller.

If the pitch in reverse can be set differently from the pitch in forward, then a steeper pitch will create better regeneration because the leading edge of the propeller is aimed more into the water flow and will therefore have less turbulence when used in regen.

James Lambden
The Electric Propeller Company
625C East Haley Street,
Santa Barbara, CA
93103

805 455 8444

james@electroprop.com

www.electroprop.com

On Jan 28, 2016, at 10:15 AM, paul.kenna@kennalaw.com.au [electricboats] wrote:

Hi

I have a 1973 S&S34 yacht MistyII that has an ageing Volvo Penta 20 something HP diesel that is developing overheating problems.

I use misty for cruising as well as some serious offshore racing at Cat 1 &2 level (although not expecting to win)

When wearing my cruising skippers hat I'd like to repower with an electric motor, dump the diesel altogether, and rely on regeneration from the propeller together with solar and wind turbine to be self sufficient on a 10 to 30 day cruise.

As a racing skipper I really need to change my current 15x10 fixed two blade prop to a folding or feathering design as it robs me about a knot in boat speed. Can such a prop be used for a regen function and still feather when I need to go quickly and be used with electric propulsion?

Paul
Melbourne Australia