Jackard wrote:game should have gunpowder
Naw, lighter than air vehicles are much more realistic than guns and cannons for the game.
More seriously, read the Wikipedia article on ballooning (
http://en.wikipedia.org/wiki/History_of_ballooning). Manned flights didn't start happening until the 1700s. And it appears that hydrogen was more commonly used than hot air. Plus the fuel source is propane or similar - which has almost 2x the energy density of charcoal.
tl;dr - Balloons are as fitting for HnH as aircraft carriers and space shuttles.