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Re: [PSUBS-MAILIST] Sitting High

To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Sitting High
From: Ray Keefer <psubs2001@yahoo.com>
Date: Fri, 20 Oct 2006 14:40:18 -0700 (PDT)
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In-reply-to: <BAY119-DAV16A6159E0D4B077C46C34EDD0F0@phx.gbl>
Reply-to: personal_submersibles@psubs.org
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Hi Pat,

Sure, you can make larger ballast tanks and get more
positive bouyancy. 

Something to consider though. Only the part of the
ballast tank that displaces water adds to the
bouyancy. Any portion of said tank that is above the
water line is not adding to bouyancy. As a result a
really big tank may only have a portion of its volume
doing any good. 

One way to gain advantage of all the volume of a large
bouyancy tank is to place it so low in your design
that it always is under water. The draw back is that
your center of boyancy is lowered while your center of
gravity is raised. Making for more instablilty.

When flooded a really big bouyancy tank, well actually
any bouyancy tank, adds to the entrapped mass and
interia that the propulsion system has to move. Its a
trade off.

Regards,
Ray

--- Patrick <pat_man_ta@hotmail.com> wrote:

> I had considered hydrofoils. If it has been done
> then it is obviously 
> viable.
> But I am still wondering if one could simply make
> larger ballast tanks and 
> add more positive buoyancy to get more of the sub
> out of the water.
> 
> I have been toying with this on the back burner of
> my mind and in my 
> doodles.
> 
> 
> 
> ----- Original Message ----- 
> From: "George Slaterpryce" <gslaterp@hotmail.com>
> To: <personal_submersibles@psubs.org>
> Sent: Wednesday, October 18, 2006 2:06 PM
> Subject: Re: [PSUBS-MAILIST] Sitting High
> 
> 
> > Also, the AUV on the orignal XXX did the hydrofoil
> thing if you 
> > remember... I think it was named Ahab.
> >
> > George H. Slaterpryce III
> > www.bridgessoftware.com
> > www.captovis.com
> >
> > ----- Original Message ----- 
> > From: "Patrick" <pat_man_ta@hotmail.com>
> > To: <personal_submersibles@psubs.org>
> > Sent: Wednesday, October 18, 2006 1:42 PM
> > Subject: [PSUBS-MAILIST] Sitting High
> >
> >
> >> Has anyone explored design options that would
> allow a psub to sit high on 
> >> the surface?
> >>
> >> I think it would be interesting to try to build a
> sub that could ride 
> >> high and drive on the surfece in a boat-like
> manner.
> >>
> >> Any opinions/input?
> >>
> >> -patrick
> >>
> >>
> >>
> >>
>
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Follow-Ups:
- Re: [PSUBS-MAILIST] Sitting High
  - From: "Rick and Marcia" <empiricus@telus.net>
- Re: [PSUBS-MAILIST] Sitting High
  - From: "Patrick" <pat_man_ta@hotmail.com>

References:
- Re: [PSUBS-MAILIST] Sitting High
  - From: "Patrick" <pat_man_ta@hotmail.com>

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