[Electric Boats] Re: Testing Prop Efficiency

 

Hi Reino,

Sounds interesting. How did your friend measure the thrust at the drive to hull assembly?

Fair winds,
Eric
Marina del Rey, CA

--- In electricboats@yahoogroups.com, redu <reino.urala@...> wrote:
>
> My friend
> measured el-drive propeller efficiency by measuring the thrust force at
> drive-to-hull-assembly, while the boat was moving normally on sea. The
> prop output power is of course P = v * F, where v = boat speed, and F =
> measured thrust. Motor output power is of course current * voltage *
> specified motor efficiency. He has a super propeller with wide aperture
> and narrow blades. The measured super prop efficiency was 60%.
>
> reino urala
>

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