>> I don't know the difference between burn fast and explode.  Does 
>> fuel
>> burn fast and if the engine flies apart then the fuel was 
>> "exploding" ?

Even fuel in liquid rocket motors does *NOT* explode - at least not 
intentionally.
There are experimental rocket engines known as PDEs (Pulse Detonation 
Engines) where the fuel is injected and compressed and then literally 
detonated. The noise is immense and the forces are substantially 
higher than in a normal engine. In a normal rocket motor you know when 
detonation has occurred because the engine is scattered widely in many 
pieces :-).




                Russell 

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