This was posted in a draft ruleset for the F12 class
1.5.2 Each hull shall carry at least 30 liters of flotation, which may be provided by solid closed
cell foam, solid blocks of compacted foam granulate, air bags or sealed air compartments.
I was wondering about what a "sealed air compartment" really is, how you build it, and how you drain it if/when water condensates inside it? Via a drain plug, or is a hatch good enough?
I did not want to muddy their rules discussion with a technical question, so I choose to post the question here in the homebuilders forum.