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ZL1UIC > INFO 27.07.02 18:30l 35 Lines 1265 Bytes #999 (0) @ WW
BID : 940154ZL1UIC
Read: DB0FHN GUEST
Subj: Re: VK3AKB > submarines
Path: DB0FHN<DB0ZWI<DB0HOT<DB0MRW<OK0PPL<RZ6HXA<IK1ZNW<HA3PG<ZL2TZE<ZL2TZE<
ZL2WA<ZL1UX
Sent: 020727/0431Z @:ZL1UX.#20.NZL.OC #:37764 [Hamilton] FBB7.00i $:940154ZL1UI
From: ZL1UIC@ZL1UX.#20.NZL.OC
To : INFO@WW
In reply:
> Has anyone some idea as to EXACTLY how a submarine regylates buoyancy
> and the physics involved? I'm referring specifically to the term
> "blow ballast".
I suspect (so please don't shoot me down) that the compartments used for
flooding with water, for the purpose of regulating buoyancy (or more
specifically,achieving neutral buoyancy) of the vessel are displaced with
compressed air stored in HP tanks; the smaller volume of the tanks being
offset by the water-flooded compartments. Snorkel devices being used for
the recharging of the compressed air tanks instead of surfacing completely
to do this. Basically neutral buoyancy would give the ability to vary the
depth as required by control of yhe diving planes, similar to the
elevators on an aircraft.
> BTW, the term "displacement" is NOT a nautical
> term, but one used in physics. When it comes to ships, it refers to
> the weight of water displaced by the gross tonnage of the ship.
Exactly. This is what Archie Meads discovered many years ago, and has
succeeded in confusing everone since!!
Cheers/73,
Allen, ZL1UIC @ ZL1UX .#20.NZL.OC
Message timed: 16:00 on 2002-Jul-27
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