PURPOSE:To contrive the length of a sufficient range and control the increase of air resistance at the time of inertia flying to make possible use as a high energy shell by separably mounting a shell body at the edge of a motor case provided with a combustor for ram jet propulsion while providing a separation mechanism for working after ram combustion completion to separate the motor case from the shell body. CONSTITUTION:When ram combustion of a sustainer propellant 6 ends, an explosion bolt 14 of a separation mechanism 8 is actuated at specified timing by the actuation of a timer and the like to release the restraint of separation bands 13, 13. The restraint of the motor case 2 and the nose fairing 7 are released as soon as the separation bands 13, 13 are broken from a motor case 2 and nose fairing 7. As a result the nose fairing 7 and the motor case 2 are separated from each other, on the other hand, the nose fairing 7 itself separates and opens its head and a shell body 9 is separated from the nose fairing 7. Thereby the shell body 9 continues to fly toward a target by inertia independently.
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