Join Date: Nov 2002
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I'm with HelloSailor on the subject of pony bottles. Depending on the size of the pony, it could hold as little at 6 cubic feet at atmospheric pressure, though I've seen larger ponies up to 40 cubic feet.
If I'm remembering my old Avon Redcrest correctly, there was an optional emergency inflation kit available that used CO2. Don't know if that's still an option or not.
Have you considered that a standard inflatable won't be very stable in a storm and likely to flip? Life rafts are available with ballast pockets to help them stay right side up when the going gets rough.