[quote=@So Boerd]
So I did some insane maths (literal rocket science) and found out how to make airships cost effective.

PROBLEM: Firing regular guns produces CRAZY recoil, and regular naval guns are incredibly heavy and big. So, as a solution, I present the most steampunk thing ever. 

SOLUTION: The Resian Rocket Barge™! A small, essentially unarmored (armor above small arms/flak levels in the magazines and on the balloons) ship that is for air to ground operations. Somewhat accurate Hale rockets fired at 8000 feet can go approx 10 km and since your target is an army, the accuracy doesn't matter. There is no recoil and many more rockets can be carried than shells.
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I feel that you like maths... like really, really like maths.