{HEAD ~ The simulator} incorporates a liquid or solid spring for simulating the force pulse on a projectile during {TAIL ~ firing} of the projectile 
{ HEAD ~ The simulator } incorporates a liquid or solid spring for simulating the force pulse on a projectile during { TAIL ~ firing } of the projectile
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH