The 100-lb. Smoke Bomb M47A2 and AN-M47A3 (Figs 10 & 11) consists of a 100-lb. Bomb Body M47A2 filled with either 100 pounds of WP (white phosphorus) or 72 pounds of PWP (plasticized white phosphorus - a mixture of white phosphorus and synthetic rub-ber in xylene). This bomb is equipped with a tetryl or black powder burster, and an in-stantaneous functioning, air-arming nose Fuze AN-M126A1. The only difference between the M47A2 and the AN-M47A3 is in the length of the tail fins. The tail fins of the AN-M47A3 are three inches longer for increased flight stability.

Figure 10 - M47A2 WP-filled bomb, breakdown

When the bomb is released from the aircraft the arming wire is withdrawn and the arm-ing vanes of the fuze are free to rotate. After 725 feet of air travel the fuze is fully arm-ed. Upon impact the striker overcomes the creep spring and strikes the detonator, ex-ploding the burster, which scatters the white phosphorus over a circular area of approxi-mately 30 to 50 yards in radius. An effective white smoke screen is produced for 1 to 2 minutes (WP) and three in five minutes (PWP).

The Smoke Bomb Bodies M47A2 and AN-M47A3 are 46 inches long (49 inches long in-cluding spacer, sleeve, shipping plug and tail) and 8 inches in diameter. The body is made of 1/16 inch lap-welded steel and is threaded at the nose to take an axial burster well, which extends to the tail of the bomb body. A sheet steel box-type tail assembly is wel-ded to the bomb body. With the burster well installed, the bomb empty weighs approxi-mately 26 pounds. Two suspension bands of sheet steel, each equipped with a  suspen-sion lug, circumscribe the bomb body. The bomb ready for dropping weighs approximately 126 pounds when loaded with WP and 98 pounds when loaded with PWP.

Figure 11 - M47A2 WP-filled bomb, exterior