[PSUBS-MAILIST] minn-kota cabling to hull

Wed Apr 22 12:48:40 EDT 2015

Cliff,
Machining from a solid block seems expensive.
just had a quick google & there is nylon tube available in dimensions that could
be machined into a kort nozzle. 
ie one there is 600 OD 430 ID & 600mm long.
http://www.theplasticshop.co.uk/material_tolerances_and_weights/nylon-6-tube-availability-tolerances-and-weights.pdf
Down toward the bottom of the pdf you get in to the more suitable dimensions.
You have probably finished all of yours, but this may be an option for others
dependant on price.
Alan

Sent from my iPad

> On 23/04/2015, at 2:52 am, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
>  Alan, the machine shop sourced a nylon cylindrical block that they cut into two sections.  Used CNC machine center to shape.  Surface finish came out very nice.  The issue on making these  Kort nozzles to me is unit volume.  If there was enough volume, then we could design an injection mold and make these dirt cheap but making a mold in not easy nor cheap.  I sent a drawing of the kort nozzle to Vance a while back and he was talking with his machine shop on different ways to make the nozzle.  He to was looking into doing a FRP layup.   The key to making a kort nozzle efficient is  having the correct interior and exterior curved profiles (along with the right prop).  So to me if you had access to a lathe, you could do a FRP layup of a ring and turn the profiles.  You could also layup female molds and either do layup on these or try and cast them.  For me it was easier to send the STEP file to my world class machinist and let him CNC the parts. 
> 
> As to material, after looking at a bunch of different metals and plastics, I ended up going with nylon.  It machines good,  has good dimensional strength and does not imbibe a lot water and does not require any final coating as is not bad on cost and they could supply it in black. Looked at 6061-T6 aluminum or 7071.  My machinist raves about  7071 says it machines very nicely and is stronger.  I did not go with aluminum for the R300 upgrade because of the weight vs nylon and I would have to anodize or powder coat. 
> 
> Alec has be doing a lot of work lately on his rapid prototyping.  Maybe he could comment on materials and if these kort nozzles could be fabricate on equipment like his.
> 
> Cliff 
> 
>  
> 
> 
> 
> 
> 
> Cliff Redus
> Redus Engineering
> USA mobile:  830-931-1280
> cliffordredus at sbcglobal.com
> 
> From: Alan James via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
> Sent: Wednesday, April 22, 2015 2:01 AM
> Subject: Re: [PSUBS-MAILIST] minn-kota cabling to hull
> 
> Cliff,
> there was a thread a while back on making kort nozzles,
> how did the machine shop make yours? Was it a block of nylon 
> they machined them out of or did they mold the nylon to a rough
> shape & machine that?
> I made mine by finding a suitable bucket, wrapping fiber glass around 
> the bucket then finishing by hand. I am thinking you could make carbon 
> fiber roughs this way & send them off to be machined.
> Cheers Alan
> 
> 
> 
> From: Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
> Sent: Wednesday, April 22, 2015 7:22 AM
> Subject: Re: [PSUBS-MAILIST] minn-kota cabling to hull
> 
> 
> Jon, I have been making some progress on my Minnn-Kota 101 thruster project. The modified thrusters (added Kort Nozzle, Subconn  electrical penetrator and pressure compensation port).  To see photos go to  http://www.psubs.org/,  then hit projects and photos section, on the projects page under find at the top of this page, change from submersible to research and hit search.  The photos are listed under MK-101 thruster.
> 
> The thrusters are ready to go on the boat but I am in the process of repainting the exterior and interior due to hull mods and then I have to put everything back together.  I hope to be back in the water this summer.  Still need to do some performance testing of the thrusters.
> 
> Cliff
> 
> 
> 
> 
> 
> Cliff Redus
> Redus Engineering
> USA mobile:  830-931-1280
> cliffordredus at sbcglobal.com
> 
> 
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