[hpv-boats] hpv-boats Digest, Vol 55, Issue 2

[dennis]

APC make a 16 x16 prop if that is any help

Dennis A

----- Original Message ----- 
From: "David Adrian" <info at velosub.com>
To: <hpv-boats at bikelist.org>
Sent: Saturday, October 24, 2009 10:28 AM
Subject: Re: [hpv-boats] hpv-boats Digest, Vol 55, Issue 2


> Sorry to react so late to Rick's propeller advices.
> For my aquatic vehicles I tested the props sold through Hobbycity, the 
> master
> airscrew 15x10 and the 18x12. 12 being the maximal pitch they sell. 
> Obviously
> they lack pitch if you keep the same gear.
>
> As I definitely needed more pitch I wanted to try the 15x25 Bolly, but it 
> seems
> that Bolly have stopped somme of its works. The 15x25 prop is only sold by 
> 30
> pieces.
> I am still looking for one, if one of you get one and could kindly sell it 
> to
> me, I would be the happiest.
>
> David
> www.velosub.com
>
>
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> Today's Topics:
>
>    1. Re: Propellers (Rick Willoughby)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 5 Jul 2009 18:08:56 +1000
> From: Rick Willoughby <rickwill at bigpond.net.au>
> Subject: Re: [hpv-boats] Propellers
> To: HPV Boat <hpv-boats at bikelist.org>
> Message-ID: <89DFF61F-8C2E-4141-9D4A-49FAADCEF1B8 at bigpond.net.au>
> Content-Type: text/plain; charset="US-ASCII"; delsp=yes; format=flowed
>
> Ken
> I have been travelling.  I did email directly but not sure if you got
> it.
>
> The best prop is designed to suit the application.  You need to know
> what power you can produce and what speed you will achieve with that
> power. If you have a hull in mind then the speed v power can be
> worked out.  The best way to determine your power output is to do a
> test on a recumbent machine at a gym.
>
> Typical value of cadence is 70rpm and prop speed is 300rpm.  The
> 300rpm works well for a suitable prop.
>
> JavaProp is quite good for designing a prop.  You need to set the
> Options to suit water and select a suitable foil.  You need to select
> a foil.  The E193 at Re# 100,000 and 1 degree AoA is OK.   The design
> process is iterative.  You need to achieve adequate strength while
> aiming for the highest efficiency.
>
> If you can weld then the easiest way to make a nice prop is to use
> stainless steel flat bar.  I have a procedure for this.
>
> The Bolly boat prop is OK for an easily driven hull.  Will not be as
> good as you can make to suit but still good for most applications.
>
> Rick
>
>
> Greetings All,
>
> It's time for me to do a little research on propellers and such.  I was
> looking at Rich W's. boat here:
> http://www.rickwill.bigpondhosting.com/V11J_Dec_2008.jpg   and I
> noticed a
> wide and steeply pitched prop.  I'm sure that this is a very efficient
> setup, so are there plans/drawings for this prop?  How wide is it,
> and at
> what pitch?  Are there props for sale?  If I have to make my own, what
> materials would I use, wood, fiberglass, or...?
>
> On a related thread what rpms do these generally run at, and what
> cadence is
> typical for the pedaling?
>
> Thanks a lot,
>
> Ken
>
>
> Rick Willoughby
> rickwill at bigpond.net.au
> 03 9796 2415
> 0419 104 821
>
>
>
>
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> End of hpv-boats Digest, Vol 55, Issue 2
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