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Peter
Just a few thoughts, if you used “Dry Pine” would it not compress at depth? If the Dry Pine is coated with GRP and compresses at depth causing the GRP to crack or leak would the Dry Pine then be in danger of absorbing water and loosing the buoyancy it is there to provide?
Regards
Steve Pearce
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Hi Psubbers,
In my limited knowledge - flotation - that is extra incompressible buoyancy - is used only for ultra deep dives. In my understanding tits used when a U-boats pressure hull gets so heavy due to structural loads that it itself will not be buoyant. The classic example of this would be the Trieste bathyscaphe. Trieste used a gasoline tank - absolutely incompressible - but not that efficient at - 250 kg lift pr. m3.
Who do a psubs need this when the designer is working in the 300 feet range ?? If he really needs it - my practical idea would be to make use of wood.
Dry pine wood has a density of about 500 kg / m3, and painted with epoxy or sealed with polyester / fiberglass it would form a nice simple solution in the depth range we are talking about.
Best Regards,
Peter Madsen
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