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Old Feb 12, 2013, 08:58 PM
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This is actually what the Graf Zeppelin did. The gas cells were divided into two sections,with the lower one being filled with a propane-like gas called "blau gas" that had the same density as air so that there was no change in buoyancy as it was consumed by the engines. I guess they decided it took up too much volume though since this practice was discontinued on the airships built after the Graf.
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