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Joe,
I'm sure it's all dependant on what
you want the sub to do. For me, I want something with decent surface
running so that I can drive the thing to the dive location. With this in
mind, I am looking for quite a bit of ballast bouyancy to get as much of the
boat out of the water as I can to reduce the drag. I am looking to have my
dive planes up high on the hull so that they clear the water as well when in
surface trim.
However, I figure if you just want
enough ballast to get you sufficient free board, you could get away with
considerably less than 40%.
Myles.
----- Original Message -----
Sent: Sunday, October 30, 2005 6:38
AM
Subject: [PSUBS-MAILIST] Re: Preliminary
calculations, please check me
Thanks Paul and Myles,
30 to 45% is quite a bit, I am still working the numbers to see if this is
doable.
Joe
From: Paul Kreemer <paulkreemer@gmail.com>
Reply-To: personal_submersibles@psubs.org
To: personal_submersibles@psubs.org
Subject: Re:
[PSUBS-MAILIST] Preliminary calculations, please check
me
Date: Sat, 29 Oct 2005 18:50:07 -0700
Yes, using 63 lb/cf of seawater gives about 16cf needed to
weigh 1000lb.
I think a WWII style boat which was more on the surface than
submerged
would have 30% or more reserve buoyancy. Like Myles
says.
Joe,
My design calls for about
45%. I want to get that thing out of the water when surface
running. Also, I
figure a guy needs all the bouyancy he can get when launching the
thing so that
you don't need 6' of water. I'm going for the "better to
have too much
than not enough" concept. Hopefully I'm not overlooking
something.
Myles.
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