[Buddahaid]

Originally Posted by Catfish

I once had the idea to use pumps to convert helium gas to a liquid into hipg pressure bottles to reduce size of the helium bags (and vice versa) to control buoyancy, but of course the pumps would have been too heavy. Seems Aerostech uses another approach, i wonder how this is supposed to work.. maybe the gas is heated, or cooled for control?

The Shenandoah collected water vapor from the engine exhaust to counteract the weight loss from burning fuel. Helium was so expensive and rare then that they couldn't afford to vent it.