[PSUBS-MAILIST] Plastic Propeller

Fri Apr 14 09:00:03 EDT 2017

Alan, this is an excellent video.  With our thrusters only dealing with 1-3
hp, loading will be a fraction of what it is with the props shown.  I am
interested in printing a prop that came out of the research my students did
on the variable pitch prop that matched the kort nozzle I use.  Thanks for
posting this.

cliff

On Fri, Apr 14, 2017 at 6:08 AM, Alan via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Just looked at a video where they tested printed props on a
> 15hp Yamaha. ABS failed but polycarbonate worked!
> https://m.youtube.com/watch?v=scUEEQyC0GI
>    These people are in my town, so this may be a viable option as
> my thrusters are only 2.5 hp
> Alan
> Sent from my iPad
>
> > On 14/04/2017, at 9:35 PM, emile via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
> >
> > Alan,
> >
> > The propellor from my rimdrive thruster is 3D printed in ABS.
> > Seems strong enough.
> >
> > Emile
> >
> > -----Oorspronkelijk bericht-----
> > Van: Personal_Submersibles [mailto:personal_submersibles-
> bounces at psubs.org]
> > Namens Alan via Personal_Submersibles
> > Verzonden: vrijdag 14 april 2017 3:24
> > Aan: Personal Submersibles General Discussion
> > Onderwerp: Re: [PSUBS-MAILIST] Plastic Propeller
> >
> > Thanks Ian, Greg & Hank.
> > Ian, I hadn't thought of that 2 propeller type bow thruster as a left
> hand
> > propeller source. I will track one down & test it. I can always trim the
> > diameter down a bit if it is in the ball park. The price isn't too bad
> > either. If we could print our own propellers, that would be awsome.
> >   Greg, the motors I am using are rated for 50 Amps continuous & I am
> using
> > a direct drive. In my calculations, I would need to go to a really low
> pitch
> > prop if I went to a larger diameter, & I haven't seen anything that low.
> I
> > was using a 7&1/4" 2hp Yamaha prop for testing & it only drew 33 amps. It
> > will be a matter of pool testing a few of these props & finding a good
> > economy of Amp draw & thrust but it is being dictated to a degree by
> what I
> > can get in right & left hand.
> >   Hank, looking at these propellers again, it would be very difficult to
> > cast them.
> > If I made a silicone mold I'd never get the part out. It would also be
> > difficult to get resin in to the blade area & get air out.
> > Found out that the new motors I ordered are being used commercially on
> > electric surf boards, so I can't be too far off track.
> > Cheers Alan
> >
> >
> >
> >
> > Sent from my iPad
> >
> >>> On 14/04/2017, at 12:32 PM, irox via Personal_Submersibles
> >> <personal_submersibles at psubs.org> wrote:
> >>
> >>
> >> Hi Alan,
> >>
> >> it might be a bit big for you, but the smallest cheap counter rotating
> >> prop set I've found is from "Quick", they do a 4 blade 185mm in RH and
> >> LH for $40-$80 (depending on where you order them).  Part numbers:
> >> BTQ185 LH (QI55507)
> >> BTQ185 RH (QI55508)
> >>
> >> http://www.quickusastore.com/bow-thrusters/spare-parts/bow-thrusters-p
> >> ropellers.html
> >>
> >> I got a pair and installed the on cheap ($45) trolling motors.  They
> made
> > a big difference over the stock props, but of would probably burn out the
> > cheap trolling motors quickly.  I didn't get around to look into reducing
> > the diameter to better match the motors (plus I want to use better motors
> > anyway).
> >>
> >> An SLA 3D Printer may be able to print something which could be used
> > (after UV curing).
> >>
> >> Cheers,
> >> Ian.
> >>
> >> -----Original Message-----
> >>> From: Alan via Personal_Submersibles
> >>> <personal_submersibles at psubs.org>
> >>> Sent: Apr 13, 2017 4:52 PM
> >>> To: personal_submersibles at psubs.org
> >>> Subject: [PSUBS-MAILIST] Plastic Propeller
> >>>
> >>> Greg, (or anyone else as knowledgeable) I am going to test a Vetus
> >>> 146mm propeller soon. On paper it seems a good match to my motor. I
> >>> have not seen a left hand prop (which I
> >>> need) & the right hands go between $56- & $100-. Also I may need a
> >>> slightly smaller diameter. They are made of delrin.
> >>> Is there an easy / inexpensive way of replicating something similar?
> >>> I was thinking they could be printed & the print used as a lost wax
> >>> type aluminium casting.
> >>> I could make a silicon mold from a print & cast a fiber reinforced
> >>> propeller, but aren't sure about the strength & quality I could get.
> >>> Any thoughts on the best way of doing this?
> >>> Thanks, Alan
> >>>
> >>>
> >>> Sent from my iPad
> >>>
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> >
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