I've looked up the flammability limits of Hydrogen in air, at normal
conditions, and the flame speed. Flammability limits are 4 to 75% by
volume and flame speed peaks at a respectable 8fps. It is followed closely
(haha) by acetylene with 8 to 80% by volume and 4fps flame speed. Propane,
butane etc all have narrow flammability limits and slow flame speed. When
you compress the mixture the flame speed and the flammability limits both
go up (wider, faster). If you heat the mixture or increase the density for
example by compressing it even more so. Beginning to get why piston
engines don't like H2 ?  H2 is about the worst knocking-fuel you can get.
Maybe it would be useful in a pulse jet or something like that where big
bangs are an advantage. OTOH in a rocket it is perfect, guaranteeing total
(?) burn inside a relatively small combustion chamber at respectable mass
flow.

Peter

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