I don't think it should be in the bilge... but in the cabin, mounted on a a bulkhead or such forward, near the mast. My bilge is probably a bit shallower than yours, being two inches deep or so...
A 1 lb. tank, like you would use for a camping stove or propane torch is plenty of fuel to blow up a boat. The explosive concentrations of propane range from 2.4-9.5% of the atmosphere by volume IIRC. If your cabin has a volume of 600 cubic feet, you'd only need 14.4 cubic feet of propane to make it explosive. Also, fuel-air mixtures are capable of the largest, most powerful explosions after nuclear weapons... the US has used their largest FAE bombs to clear entire minefields...
The amount of butane contained in a cigarette lighter re-fueling canister (2.5 oz.) is more than enough to be dangerous.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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