Now, you may be thinking, "how can a balloon like that keep an equally sized ship afloat?" well, that's been my main problem when designing airships. To solve this, I've filled the balloon with a lighter than air gas(much lighter than helium) made from boiling a (unnamed, I'm not good with names remember?)liquid piped straight from the boiler into the balloon, when the gas condenses, it drains back into the boiler and is reused.
The balloon was a tricky bit, as it had to balance rather precariously on the mast, it also took about 85% of my tan pieces(the rest being base-plates and minifigs)
Do to the highly volatile nature of the gases, firearms are not used, well, not by sane people that is...
Because of the aforementioned nature of the gas used in the balloon, ship-makers take special care when constructing the boiler, in-casing the burner in an airtight locker. In addition, the exhaust is underneath the ship, to reduce the risk of leaked gases catching fire from a cinder. Some of the newer ships have a scrubber, a water filled sponge, lining in the exhaust pipe, to reduce the amount of cinders.
seen here is the boiler, and the crankshaft for the propeller. The smoke is drawn out the exhaust system by the displacement of air caused by the propeller.