[PSUBS-MAILIST] Propeller

[Alan James via Personal_Submersibles]

Thanks Hugh,had a look at some of the ducted props & they seem a lot different in design from the normal ones.One of my problems is I am trying to get away with not using a gear box, & need a verylow pitch prop to compensate.Will have a look around the marine chandleries & see what's on small motors & look at ductedprops if they have any.Might take a cresent with me:)Alan
      From: Hugh Fulton via Personal_Submersibles <personal_submersibles at psubs.org>
 To: 'Personal Submersibles General Discussion' <personal_submersibles at psubs.org> 
 Sent: Friday, December 5, 2014 8:18 AM
 Subject: Re: [PSUBS-MAILIST] Propeller
   
#yiv1368643028 #yiv1368643028 -- _filtered #yiv1368643028 {font-family:Helvetica;panose-1:2 11 6 4 2 2 2 2 2 4;} _filtered #yiv1368643028 {font-family:Helvetica;panose-1:2 11 6 4 2 2 2 2 2 4;} _filtered #yiv1368643028 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;} _filtered #yiv1368643028 {font-family:Tahoma;panose-1:2 11 6 4 3 5 4 4 2 4;}#yiv1368643028 #yiv1368643028 p.yiv1368643028MsoNormal, #yiv1368643028 li.yiv1368643028MsoNormal, #yiv1368643028 div.yiv1368643028MsoNormal {margin:0cm;margin-bottom:.0001pt;font-size:12.0pt;}#yiv1368643028 a:link, #yiv1368643028 span.yiv1368643028MsoHyperlink {color:blue;text-decoration:underline;}#yiv1368643028 a:visited, #yiv1368643028 span.yiv1368643028MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv1368643028 p.yiv1368643028MsoAcetate, #yiv1368643028 li.yiv1368643028MsoAcetate, #yiv1368643028 div.yiv1368643028MsoAcetate {margin:0cm;margin-bottom:.0001pt;font-size:8.0pt;}#yiv1368643028 span.yiv1368643028EmailStyle17 {color:#1F497D;}#yiv1368643028 span.yiv1368643028BalloonTextChar {}#yiv1368643028 .yiv1368643028MsoChpDefault {font-size:10.0pt;} _filtered #yiv1368643028 {margin:72.0pt 72.0pt 72.0pt 72.0pt;}#yiv1368643028 div.yiv1368643028WordSection1 {}#yiv1368643028 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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