The present invention requires an outer shell structure for protection from harmful elements due to the high speed flight of a rocket and a payload such as a satellite in a projectile such as a rocket, and for improving flight performance. The present invention provides a small rocket in which the left and right outer shell assemblies are fixed to surround the load and the nose tips are fixed to the upper left and right outer shell assemblies. To;A piston operating pressure generator for generating explosive working pressure by exploding gunpowder with a separate electrical signal, and an upper restraining piston assembly for separating and detaching the outer upper restraining assembly which restrains the nose tip with the operating pressure generated by the piston working pressure generator; And by releasing the side restraining piston assembly to push and disengage the left and right skin assemblies with the remaining working pressure driving the upper restraining piston assembly.
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