Tim Downie wrote:
snip
Serious question, why can't you get bottled natural gas specifically for use
on boats? Given that boat makers can't use the ideal solution (i.e. drill
holes in the bottom to let the gas out), it would seem immensely sensible to
use a lighter than air gas on board boats.

Didn't I hear that the Hindenburg started out as a boat... ??

--
Rod