Re: [PSUBS-MAILIST] hydrodynamics question

["Jeff Post" <jeffpost@rawbw.com>]

I too would be interested in see that article. I'm sure a lot of PSUBers
would be interested.

JP

----- Original Message -----
From: Michael Holt <mholt@richmond.edu>
To: <personal_submersibles@psubs.org>
Sent: Friday, May 17, 2002 8:07 PM
Subject: Re: [PSUBS-MAILIST] hydrodynamics question


> Alec Smyth wrote:
> >
> > My design has twin props astern, in tunnels fed by side-scoops (a la
fighter
> > jet). I'm currently making the mold for the stern fairing, and I'm
> > contemplating the best size and shape for the scoops. Given that water
is
> > essentially incompressible, am I correct to assume the frontal area of
the
> > scoops should be the same as the area of the prop tunnels? Another
> > possibility would be to eliminate the scoops altogether and go with NACA
> > intakes or such. But the scoops are definitely sexier.
>
> Keep in mind that NACA intakes or scoops will ingest all sorts
> of floating stuff.  You're gonna have to find a way to screen
> them -- probably with bars parallel to the flow, because real
> screens would add significant drag.
>
> I have here a paper on pumpjet design.  It's from "Underwater
> Missle Propulsion," editied by Leornard Greiner and published
> in the 60s by Compass Publications.    If you're interested,
> I can try to have it scanned.
>
> I'd like to see pictures of what you're doing, too.
>
>
>
>
>
> Mike H.
>