초록 ▼

A training projectile that utilizes flutes or flats to augment roll damping characteristics and thereby cause the projectile to crossover into a gyroscopically unstable trajectory pattern at a predetermined time. Prior to the crossover, the training projectile maintains a gyroscopically stable traje

A training projectile that utilizes flutes or flats to augment roll damping characteristics and thereby cause the projectile to crossover into a gyroscopically unstable trajectory pattern at a predetermined time. Prior to the crossover, the training projectile maintains a gyroscopically stable trajectory, which enables extrapolation to ascertain the trajectory of a non-training projectile that does not have an augmented roll damping section. The unstable trajectory pattern substantially reduces the distance the training projectile can traverse, thereby reducing the amount of area required for a training range.

대표청구항 ▼

[ What is claimed is:] [1.] A spin-stabilizer projectile comprising:an ogival nose portion;a posterior portion; anda midportion disposed between said nose portion and said posterior portion, said projectile defining an elongated, aerodynamically-shaped body having an axis of rotation;said midportion

[ What is claimed is:] [1.] A spin-stabilizer projectile comprising:an ogival nose portion;a posterior portion; anda midportion disposed between said nose portion and said posterior portion, said projectile defining an elongated, aerodynamically-shaped body having an axis of rotation;said midportion comprising a longitudinally extending roll damping augmentation section disposed in a circumferential surface recess thereof, said roll damping augmentation section comprising a plurality of members which extend outwardly no more than about the depth of said recess and at least twice as high as the projectile boundary layer momentum height, for causing said projectile to become gyroscopically unstable at a predetermined range and continuously gyroscopically unstable thereafter.