M105 (Nose Mechanical Impact) (Obsolete)

Bombs

Functioning

Armed condition

Fuzes used with

Arming time, seconds

Vane span, inches

Body diameter, inches

Over-all lenght, inches

Material

Body, striker assembly, and safety discs are of cadmium-plated steel. Gear train and arming vane hub is of brass. Detonator cup may be of brass or plated steel.

Operation: Upon release from the plane, an arming wire is pulled to allow the vanes to rotate in the air stream. The reduction gear carries this rotation to the arming screw, which unthreads from the striker to lift the vane cap. After 450 to 460 vane revolutions, the cap will be lifted high enough to allow the spring-loaded safety discs to be expelled from beneath the striker head. Additional rotation will cause the arming screw to thread out of the striker, allowing the arming mechanism to pull away from the bomb. Upon im-pact, the striker block is forced down, cutting the shear wire and forcing the two strikers against the firing assembly. If the setting pin is in the deep slot, the fuze is set for delay action and the striker point over the instantaneous channel merely protrudes into the empty recess, with no effect; the delay cap, being fired, sets off the delay and relay element, detonator, and bomb filler. If the setting pin is in the shallow slot, the fuze is set for instantaneous action, and the instantaneous firing pin sets off the primer cap, detonator, and main filler, before the delay can function.

Remarks: No. 4 primer caps are used to initiate both trains of explosive. The delay channel and detonator assembly are as follows: delay train of 0.32 grains of black pow-der, the relay charge of 1.47 grains of lead azide.

Figure 331. Nose Fuze M105