[Public-List] Standard Prop Size and Pitch

[Robert Kirk]

Larry... That's interesting. There was a discussion on the list some time 
ago where some member was proposing to go electric, and he gave some specs 
from the manufacturer. I did some back of the envelope calculations which 
didn't look to be encouraging for electric propulsion. As I recall, the 
person who was going to give it a try either did not do it, or never did 
send a follow-up.

Do you have any numbers on the endurance, at what speed, battery 
requirements, recharging rates & times, etc? Or a pointer to a reference?

Bob Kirk
Isobar #181

At 10:04 PM 5/20/2008, Lawrence Morris wrote:
>[...] It is a really interesting system that utilizes a 24v DC electric
>motor connected directly to the prop shaft with no transmission.
>reverse is accomplished by reversing the polarity in the circuit.  The
>motor is a little larger than a basketball and weighs approximately
>50kg.   The motor will charge the battery bank by free wheeling the
>prop while sailing.  Other charging options are shore power, solar and
>an aux. genset. [...]


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