[PSUBS-MAILIST] Propeller

[Marc de Piolenc via Personal_Submersibles]

With an accelerating nozzle (designed to enhance mass flow and thrust), 
you need coarser pitch for the same rpm. With a decelerating nozzle 
(designed to suppress cavitation), speed through the rotor plane is 
lower so finer pitch is needed.

Marc

On 12/4/2014 5:24 AM, Alan James via Personal_Submersibles wrote:
> I put some specs through an online propeller calculator,
> & I am told I need a 6" prop with a 3" pitch to match my 2 hp motor that
> revs at 3000rpm.
> I checked on other calculators & they also indicate around this size &
> pitch.
> With a kort nozzle there would be more load on the motor so maybe an
> even smaller propeller
> or pitch is required.
> Best I can find is a Yamaha 2hp 7&1/4" plastic prop with 4" pitch.
> I am wanting to experiment with a few props around this size & will
> probably reduce their
> diameter to see what effect it has.
> Any suggestions for an off the shelf prop that might be suitable, or advice?
> Alan
>
>
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