| 摘要 |
PROBLEM TO BE SOLVED: To provide an improved shell that stabilizes a flying attitude of a shell, increases accuracy of landing, and dramatically increases a flying distance in a shape of shell.SOLUTION: An improved shell is thinner and longer than a conventional shell. The cross section area of the body is reduced. A rifling 5 is engraved outside of the shell. A bottom surface of the shell is in a conical shape. A cap for projection 3 whose bottom surface is recessed is set for increasing projection power. |
