[PSUBS-MAILIST] (no subject)

[Smyth, Alec]

BTW if anyone wants a Kort for a 16" prop, I have a mostly-built one that I dropped due to a design change but which would save the builder a lot of time. I did like Carsten and developed the outer cone, which I cut from stainless plate. The project as it stands today consists of the outside cone with three solid SS hoops welded to it. One hoop is the leading edge, the other is the trailing edge, and one in between is just for stiffening. All welding is finished. The remaining job is to cut a template for the inside curve out of plywood, and use it to spread structural epoxy on the inside of the cone. The whole thing is 316 and the welding is finished. I have the 16" prop to match it too. However, I've gone to an all-Minnkota design. Let me know if interested and I'll email you a photo.

Best,

Alec




From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Joe Perkel
Sent: Thursday, October 31, 2013 6:46 AM
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] (no subject)

Carsten

That is also fabulous thank you! It had not occured to me to "unroll" flat sheets for metal fabrication. Very clever!

Joe

From: "MerlinSub at t-online.de" <MerlinSub at t-online.de>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Thursday, October 31, 2013 6:27 AM
Subject: Re: [PSUBS-MAILIST] (no subject)

Joe, DWG is for the metal guys in the group.

Here is my production drawing of a kortnozzle make mostly from three sheets of metal.
One cylinder and two conus.

I simplied the internal aft ring to a cylinder so it do not matter which propeller seats in the nozzel and which depth. Plates should be deliver by a watercut or laser cut shop. Or for hardcore psubers can be made with a grider or a electric saw or a torch.

Cad Drawing can be easy scale up and down. Bigger one can be make from stainless steel, free flooding with a small (Epoxy-)filler job on the entrance to be perfect. But even without the filler job it is a nice nozzle.  Small units can be made from brass plates hard soldering together.

Please not: To be work perfect with the nozzle the propeller need  at the tip ends a small tolerance to the nozzle. Means the tips of a normal free running propller has to be cut to a perfect cycle as shown in the drawing. Anyway a propeller  in a kortnozzles needs a little higher rpm than the same propeller as free runner. So thats fits.

Kort nozzle will and thrust to our props below 10 knots. At higher ship speeds the surface drag of the nzzle will eats the effects. But nearly all our boats are below 10 knots.

Hi Emile - maybe there is  a small market for Psubs-made from-massive-Delrin nozzles..

Marc or anybody - do you have any information about a kortnozzle with the propeller running reverse ??

All the best Carsten

"Joe Perkel" <josephperkel at yahoo.com> schrieb:
Im going to try to attach an image. Here is what Ive done for a MK 101 Kort Nozzle with .11 tip clearance for an 11" prop.

I need to finalize body attachment, the streamlined ABS struts have threaded rods through them.

Joe


--

Carsten Standfuß
Dipl.Ing.Schiffbau @ Meerestechnik
Heinrich Reck Str.12A
18211 Admannshagen

0172 8464 420
WWW.Euronaut.org
Carsten at euronaut.org

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