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

Claim 10:
11. A projectile comprising:
a trailing end comprising a first exterior surface;
a leading end comprising:
an interior surface through which an axis of the projectile passes; and
a second exterior surface;

an interior space extending along the axis between the trailing end and the leading end, wherein the interior space adjoins the interior surface;
a portion that extends along the axis between the trailing end and the leading end and that extends circumferentially about at least a portion of the interior space;
a rotor centered on the axis and releasably retained in a rearward position in the interior space, the rotor comprising:
a forward end that comprises a forward surface through which the axis passes;
a rear end; and
an aperture that is disposed on the axis, that extends from the rear end forward along the axis and terminates rearward of the forward surface, and that comprises an internal helix,
wherein the rotor comprises a piston;

a member that is disposed on the axis, that extends from the trailing end of the projectile into the aperture and extends in the aperture along the axis, and that comprises an external helix, wherein the internal helix and the external helix comprise a helical pair;
one or more gas inlet channels extending from the first exterior surface of the trailing end of the projectile to the interior space rearward of the rotor; and
one or more gas outlet channels extending from the second exterior surface of the leading end of the projectile to the interior space forward of the rotor,
wherein the interior surface of the leading end and the forward surface of the rotor comprise a thrust bearing that comprises a gas bearing.