[PSUBS-MAILIST] Plastic Propeller

Fri Apr 14 09:08:39 EDT 2017

Cliff,

Not only my work. I use a online 3 D print shop like . https://i.materialise.com You can even choose titanium!

The 170 mm , 6 blade prop cost abt.€ 350,- 

No idea about the stepover but surface finish is good enough. I spray painted the prop; that will work against UV. It was for several months in the water and even that proved no pb.

Br, Emile

Van: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] Namens Cliff Redus via Personal_Submersibles
Verzonden: vrijdag 14 april 2017 14:42
Aan: Personal Submersibles General Discussion
Onderwerp: Re: [PSUBS-MAILIST] Plastic Propeller

Emile, I am interested in the work you did on 3D printing of a thruster prop using ABS.  Can give us more detail? Did you use an online service to print the prop?  What was the cost?  Did you work off a 3-D model file like a STEP file?  What was the surface finish?  What incremental steps did you have to make (surface finish, machinating...) before mounting?  Did you explore any other materials than ABS?  How well has the prop held up?  How well do you think the ABS will handle UV?

Best Regards

Cliff

On Fri, Apr 14, 2017 at 4:35 AM, 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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