which doesn't really even apply to spudguns anyway (since gasoline reacts very differently when compressed than propane or MAPP gas do)
propane motors exist too last time i checked
Commonly everybody say ddt will happen at 5x or 6x mix...
Well im shooting my cannon at 7.5 x.... did it burst nope !
My chamber is now regular plumbing pipe rated at 150psi
my message isnt take your gun to 30x
most people think 10x isnt safe
remember lucky took his sch 80 plastic gun up to 8X
the idea is 10X is NOT going to break steel
pyro: the shockwave would only act on the walls of the cylinder and the cylinder itself won't burst because that would require enough force to blast open the engine block, which CAN NOT be generated because the detonation moves the piston and releases the excess gas at the end of the stroke.
not on a 4 stroke the piston pushes the exaust out the valve[/quote]