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08" in di­ ameter. It is this longer and more slender portion of the pin that engages the keyway of the slider and under the tension of the spring moves into the lock-pin recess, locking the slider in position. The lock-pin spring is made of steel music wire, has three free coils, and is held in place in the lockpin hole by the closing disk. The latter, described in a(3) above, is secured by crimping. i. Related p a r t s . 125" in diameter, fits into matching holes drilled into the surfaces of the body ledge and the base of the head.

This is the same fuze body as that assembled with the T26 rocket. i_. — This is the same component as that assembled with the T26 rocket. j . — This is the same primer as that assembled with the T26 rocket. k. — This is the same component as that used with the T26. It is assembled in the same way. 48 BALLISTICS Range, effective Effective area covered by smoke Launcher employed 300 yd. M1A1 and M9 49 ACTION a. The rocket propels itself from the launcher upon ignition of the propellant. 0-00 b. At the end of its trajectory, or upon striking the target, the firing pin continues forward, overcoming the resistance of the firing-pin spring byinertia.

It will be noted from figure 30 that the head of the T27 Length, over-all 18-5/16" rocket is shorter than the head of the Length of head 4-3/4" T26 rocket shown in figure 25. 30" than the WP filler loaded into the T26. 4 lb. Specifically, 450 gm. of HC are loaded HC charge 450 gm. 18 gm. into the shorter T27 head and 405 gm. First-fire charge of WP are loaded into the longer T26 head. In order that the two rockets e. — The compo­ have identical weight, the difference in nents of the T27 HC rocket are the the head design was necessary motor assembly and the head assembly.