Patent ID: 11867487
Assignee: nan
Field: Other special machines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 3:
4. A projectile comprising:
a gas channel extending from a gas inlet that is disposed at a trailing end of the projectile to a gas outlet that is disposed at a leading end of the projectile; and
a helical pair comprising a piston that is disposed in the gas channel, the piston comprising a rotor,
wherein the rotor fits in the gas channel and is configured to move forward along the gas channel by pneumatic force provided by gas moving into the gas channel through the gas inlet, and
wherein the rotor and a forward portion of the gas channel are further configured so that as the rotor moves forward into the forward portion of the gas channel, the rotor progressively obstructs gas flowing out of the gas outlet to form a gas bearing that comprises an aerodynamic bearing.