2段形電磁ランチアの飛翔体とその発射特性  [in Japanese] Projectiles of a Two-Stage-Type Electromagnetic Launcher and Their Launching Characteristics  [in Japanese]

The constitution of the two-stage solenoid-type electromagnetic launcher (EML), the specifications of the profectiles and solenoid coils, and a method of improving the launching velocity by eliminationg the eddy current are introduced. The influence of the projectiles with and without a slit on the launching velocity is discussed on the basis of experiments. The results are as follws: (1) For a carbon steel (S45C) projectile, the effect of a slit is very obvious. The maximum launching velocity of a projectile with a slit is 51.4m/s, 8% higher than one without a slit. (2) For a permendur projectile, the effect of a slit is slight. The launcing velocity with and without a slit is respectively 54.3m/s, and 53.5m/s, because the resistivity of permendur is 4 times than that of S45C.