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