[PSUBS-MAILIST] Propeller

[Hugh Fulton via Personal_Submersibles]

Alan, try bow thruster propellers.  They are designed for working at low water speeds and in tubes.

 

 

 

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Alan James via Personal_Submersibles
Sent: Thursday, 4 December 2014 7:20 p.m.
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] Propeller

 

Thanks Marc that's helpful.

I could find that the 4" pitch may work well in the kort nozzle then.

Alan

 

  _____  

From: Marc de Piolenc via Personal_Submersibles <personal_submersibles at psubs.org>
To: personal_submersibles at psubs.org 
Sent: Thursday, December 4, 2014 5:47 PM
Subject: Re: [PSUBS-MAILIST] Propeller


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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> Personal_Submersibles at psubs.org
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>

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