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