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RE: [PSUBS-MAILIST] RE: payload
Correct. The weight of the sub remains the same, it is the bouyancy
that is affected. But why oil and not water? Water would
weigh more and allow a smaller VBT for the same amount of bouyancy. I'm
guessing that would be more beneficial overall than any bouyancy advantage
obtained strictly between the different densities of oil and
water.
Jon
Well, the weight of the sub wouldn't change.
The oil would be either in the bladder or the internal tank but either way
it's a part of the sub and contributes to the weight. Right?
And
air would work about the same and could be used to inflate that external
bladder. It's the change in displacement that's important, not the fact
that you're using air, or olive oil or mercury to pump up that bladder.
:-)
Paul
On 12/5/06, Brian
Cox <ojaivalleybeefarm@dslextreme.com>
wrote:
Hi
Ray,
You
would still be losing the weight of the oil from inside the
sub. And you would realize positive buoyancy from the oil ( in a
badder) in a open tank connected to the sub. You would have to
use way more oil than you would just using air. I'm
not sure I am comprehending the though on this.
Brian
-----
Original Message -----
From: "Ray Keefer" <psubs2001@yahoo.com>
To: <personal_submersibles@psubs.org
>
Sent: Tuesday, December 05, 2006 11:15
Subject: Re:
[PSUBS-MAILIST] RE: payload
> Hi Brian,
>
> I
think the idea is to change the amount of
> displacement instead of
changing the amount of weight.
> Pump the oil into the bladder and
more water is
> displaced with the same weight of sub. Making the
sub
> more bouyant. Pump the water out of the bladder,
> bladder
collaspes causing less displacement for the
> weight, causing the sub
to become less bouyant.
>
> Regards,
>
Ray
>