I think is would be fun cause you could have zeppelin vs zeppelin combat with firecharges. Plus its not like this will give it any better match up against other crafts fire charges do nothing to anything not made of wood. So most fighters and ships. Droping tnt with it might be usefull but keep in mind you can already drop tnt by placing it next to a powered block on the ship. And I don't know of any ship based tnt cannon (other than slime which can already be done here you just have to place the tnt rather than have it dispense) that won't just blast a hole in the ship.

well
its to transport my nuke lol

ofc plant answered. but tbh this is a too abusable thing for zeppelins. imagine 300 tnt per sec dropping onto a banner cap by using dispensers and redstone. i cannot see this happening and not really nessesary right now. we could look up for this but right now ccnet didnt really ask for this.