Re: [PSUBS-MAILIST] Reserve buoyancy

[Jon Wallace <jonw@psubs.org>]

What is the advantage of having the tank bottom sealed with hypalon 
instead of merely open to the water?  Containment of air without burping 
(and losing air volume) at the surface?

What about building a cage for the hypalon or lift bag similar to a 
rebar skeleton use for columns?  This would retain the shape of the 
inflated bag but at the same time offer minimum drag with no water mass 
from an enclosed tank to worry about.

Jon


Sean T. Stevenson wrote:
> This suddenly made me think of something - and I'm sorry that I'm not 
> at my own workstation right now or I would sketch it - but imagine if 
> you will hard ballast tanks (saddle tanks), slung high under the 
> weather deck, sized appropriately for the design waterline with tanks 
> blown.  These tanks would have a flat bottom instead of being faired 
> into the hull, and attached to the underside of these tanks are 
> hypalon buoyancy tubes which are ordinarily deflated (thus eliminating 
> the extra mass of water to be moved, but adding some surface / form 
> drag), but which may be inflated to increase the freeboard in specific 
> circumstances, or, if appropriately sized, as a salvage measure.
> -Sean




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