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David Pearson wrote-----

Just a thought

What about rigid flotation.  A piece of styrofoam could be carved to fit 
in the gap between the tanks.  A coat or two of fibreglass to help 
resist pressure.  Viola, 5 to 10 Kg lift.  A little time with a block of 
foam could create a fairing for the two tanks that would be as 
streamlined as a single.  I would try to get enough lift to have the 
tanks neutral when empty.  The combo would only need about 9 Kg lift 
from the wings when the tanks were full.

Disclaimer:  I am a self-professed newbie.  I never listen to my own 
advice, and neither should you:)

ttfn
David Pearson

---end quoted text----

Styrofoam isn't rigid enough for a deep dive. It will compress a little 
each time it's pressurized and continue the trend indefinitly.

There is a rigid closed cell urethane foam manufactured for proofing 
tooling design and programming for CNC programming that weighs 16 lbs pr 
cubic foot that is stiff and machineable enough to do the job. It can be 
shaped with wood working tool and after sealing with epoxy paint will 
stand up to about 150psi pressure.

Fred Tagge

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