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RE: [PSUBS-MAILIST] Minn Kota - Thrust
Paul,
NavCAD is indeed a Nav Arch program for calculating required power, hull
form resistance, propeller efficiency, and all that sort of thing. It is
designed for reasonably large ships but it is fairly versatile so I think it
could be adapted for submarine use. It is a commercial product but I am
otherwise unsure of it's background. It has been proven very reliable
though. Unfortunately, I beleive it is a fairly expensive program and I am
unsure of what sort of copyright laws might apply but I'll ask my boss and
if he ok's it I can plug in a few numbers. Essentially, the calculations
are based on several sets of rules that were developed by various agencies.
The rules are all named (I can't remember any of them right now, actually I
think one of them might have been Holtrop if that means anything to anyone).
You pick the set of rules that would be most appropriate for your
application and plug in the numbers and it turns out the result your looking
for. I don't beleive it uses anything as complicated as computational fluid
dynamics (that would require a complete hull model anyways) but it does give
reasonable engineering approximations. I don't think anyone really needs to
know how fast their sub will go to the nearest tenth of a second anyways.
Anyhoo, that's my bit. Make of it what you will.
Wade Carson
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org]On Behalf Of Paul Suds
Sent: Thursday, March 09, 2000 6:17 PM
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] Minn Kota - Thrust
Wade, NavCAD? Never heard of it. That's not surprising though. Can you tell
us more? Is this hull design software, naval Architecture stuff? Is it a
proprietary model or one generated from a government agency and packaged in
civilian format. Questions, questions, we seek knowledge, you will be
assimilated. Resistance is futile...errr, sorry, wrong forum. Ok, so it's
getting late in the week. At least I'm not attacking anybody..yet :-)
Suds
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