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I lately read about zeppelins and ASW blimps in the I WW and I wonder: Hydrogen is cheap, but requires a lot of safety precautions because of tendency blow up when mixed with air. Helium is expensive and a little less effective, but more safe in use (just toxic, not explosive). Why not take a bit of either and mix? The mixture should displace enough oxygen in air in case of breach (to prevent fire and explosion) and be cheaper than using unadulterated Helium. Perhaps as a postwar modification to cure Hindenburg and R100 problems?

Would that be effective?

I am not aiming at creating POD decisive enough to create world were heavier then air transport is outsted in favour of lighter then air, but perhaps popular enough to keep them in service after II WW as ASW and early warning craft?
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