[PSUBS-MAILIST] Plastic Propeller

Fri Apr 14 07:08:26 EDT 2017

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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