Re: [PSUBS-MAILIST] Kort nozzle

[Jim Rudholm <jimrudholm@gmail.com>]

Check out Piranha Props:
http://www.piranha.com/

I used their replacement blades with a custom aluminum hub for an
Etec-powered outboard.

http://www.psnw.com/~jmrudholm/etekoutboard5.html

Jim

On Tue, Feb 9, 2010 at 1:54 PM,  <vbra676539@aol.com> wrote:
> All the talk of wake reduction and vortex vanes suggest they are talking
> about high speed props and loads of cavitation. I suspect that is the case.
> Proper kort nozzles are used in lots of places, including many high volume
> pumps, but always in low to zero cavitation, as they are close tolerance
> items and vibration is the enemy.
>
>  On the big end of that are the reactor coolant pumps used in primary loops
> at some commercial nuclear power stations. Westinghouse unit RCPs pump about
> 65K gallon/min each. Of course, it does take a 5000 horsepower motor to turn
> one, which is just outside our requirment range, if I had to guess. The pump
> rotors alone (iron core motors) where I worked weigh 44 tons apiece. Hell,
> the power cables alone weigh more than most psubs!
>
> At any rate, I suspect the closed (non-slotted) Kort at our kind of rpms
> will be the ticket.
>
> Vance
>
>
> -----Original Message-----
> From: ShellyDalg@aol.com
> To: personal_submersibles@psubs.org
> Sent: Tue, Feb 9, 2010 4:12 pm
> Subject: Re: [PSUBS-MAILIST] Kort nozzle
>
>  Hi Hugh. That looks very interesting. There's a 9 inch model too.
> Rated at 5 HP.
> The Minnkota's have an 11 inch prop but much less HP than the 35 HP rating
> on the 11" model.
> http://www.getaprop.com/content-product_info/product_id-7206/prop_guard_9_xp.html
> Very cool link. Thanks.
> Frank D.



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