[PSUBS-MAILIST] Kort Nozzle (was Group Help Request)

[Emile van Essen]

Alan and others.

 

I added a Kort nozzle to the Haswing. Seems to work fine.

 

It originates from a good quality scuba dive scooter (Brand name Gavin) . I
never measured but it comes clos to a real Kort profile.

Cost: abt. 200,-

 

Emile

 

 

 

  _____  

Van: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org]
Namens Alan James
Verzonden: maandag 28 oktober 2013 8:32
Aan: Personal Submersibles General Discussion
Onderwerp: Re: [PSUBS-MAILIST] Group Help Request

 

Joe,

I was going to suggest that Marc wade in on this subject, it is one of his
fields

of expertise. I believe he has written books on ducted fans etc.

Marc is a very talented guy hidden away in an obscure corner of the
Philippines.He may be a helpful

source of information if you want to get this right.

We sure have a multi-talented group here.

Alan

 

 

  _____  

From: Marc de Piolenc <piolenc at archivale.com>
To: Personal Submersibles General Discussion
<personal_submersibles at psubs.org> 
Sent: Monday, October 28, 2013 7:57 PM
Subject: Re: [PSUBS-MAILIST] Group Help Request


Quick clarification: a properly contoured Kort nozzle, MARRIED TO A 
MATCHING PROPELLER, will increase static and low-speed thrust. Of course 
it won't increase power, since that comes from your motor. If you just 
put a shroud around your existing prop, you will be disappointed, and a 
shroud that doesn't do the job is overpriced unless it's free! Key 
ingredients for success:

Prop matched to the shroud
Shroud matched to the speed and thrust requirement of the vehicle
Motor matched to the resulting prop

Marc

On 10/28/2013 8:33 AM, Jon Wallace wrote:
>
> What is the cost of having a true Kort nozzle machined by a CNC? I think
> a 30% improvement in thrust for $30 would be great but I suspect
> machining a Kort is going to equate to many hundreds of dollars, if not
> reaching beyond a thousand.  When I look at the Snoopy underwater videos
> it is difficult to imagine a kort nozzle really making any difference in
> the operational experience given that the motors are operating very
> slowly and pushing Snoopy around at about 2 knots (estimated).  The
> props are designed for power, but that's what we want underwater.  True,
> a kort nozzle would increase that power but what is the return on the
> cost?  In other words, on a road with a speed limit of 30mph and no
> passing zones it doesn't matter whether you have a 1.6 liter or 5.4
> liter engine under the hood does it?
-- 
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