>>10849390First let's round off Titan's gravity to .14G.
Now on Earth, at 1G the largest zeppelin ever built, the Hindenburg could hoist 10,000kg using a volume of 200,000m3 of lifting gas. If you take that volume and multiply it by .14, you only need 28,000m3 to lift the same weight. A cylinder with the same diameter as the Hindenburg (41m) only has to be about 5.4m long to contain that volume. Now the real length of the Hindenburg is 245m or about 45.37 times the length of our cylinder. If you multiply that by our 10,000kg payload you get about 453,703.7kg or 500 tons. Unfortunately, battleships usually displace tens of thousands of tons, so no, you'll never get a zeppelin battleship. Still, 500 tons isn't bad at all and you could have such a vessel carry several battleship sized guns, each of the Iowa's 16 inch gun turrets only weighs 108,000kg. You could probably armor it somewhat, but battleship plate like that applied to the Iowa or Yamato is at least or exceeds a whole foot in thickness, backed by a gap filled with concrete over another thick steel backing plate which is part of a heavy steel superstructure. Most of the structure of your air battleship could be made of a magnesium alloy which is a bit stronger and a bit lighter than aluminum, with maybe half an inch of steel plate at it's thickest point, enough to protect it's envelope and crewed sections from machinegun fire and explosive or fragmenting shells up to a certain size.
