초록

Ballistic projectiles for subsonic propulsion having a helically twisted body portion nad a tapered nose portion and having an apparent density of up to 5 g/cm3. The projectiles can be propelled through barrels having a complementary barrel without objectionable fouling.

대표청구항 ▼

A ballistic projectile which can be propelled from a smooth bore barrel, thereby having spin about the longitudinal axis imparted thereto, said projectile comprising an elongated body portion and a tapered end portion, said projectile body having a configuration which is inscribed longitudinally wit

A ballistic projectile which can be propelled from a smooth bore barrel, thereby having spin about the longitudinal axis imparted thereto, said projectile comprising an elongated body portion and a tapered end portion, said projectile body having a configuration which is inscribed longitudinally within the volume enclosed by an imaginary solid helix generated by revolving a non-circular plane figure at a constant rate around an axis contained within and perpendicular to the plane of said figure while simultaneously moving said plane figure along said perpendicular axis at a constant rate, said plane figure having a perimeter wherein all imaginary, extended, straight lines circumscribing the perimeter of said plane figure intersect at points on or outside of said perimeter, at least the surface portions of said inscribed projectile body adjoining the surface of said helical volume having the contour of said helical volume, said projectile having an apparent density up to about 5 grams/cm3.