BOMBS USED IN

FUNCTIONING

ARMED CONDITION

MAX. BODY DIAMETER

OVERALL LENGTH

DESCRIPTION:

The vane and vane assembly consist of a vane cap which is held on three retaining clips, the vanes, and the arming spinde. To the retaining clips is soldered a steel ring to prevent damaging the vanes which are of sheet steel and and are staked to the arming spindle. The spindle threads into the arming vane support and down onto the ball re-taining cap which holds four retaining balls in the groove in the top of the spring-loaded striker. A safety pin passes through the arming vane support and the striker. Below the striker is a percussion cap which flashes straight down to the primary powder pellet. At right angles to the flash channel below the cap is a vent hole and vent hole pellet. This vent hole leads to the outside, but is sealed by the outer cover in the unfired condi-tion. At the outer end of the primary pellet chamber is a short powder pellet which flas-hes through a flash channel in the fuze drum to the length of Bickford type time fuze contained in a lead foil sheath surrounding the fuze drum. Form the timing fuze to the long powder pellets leading to the magazone is a short fire hole. In the lower fuze body is housed the magazone. On the side of the fuze on the outside is a graduated scale from 0 - 95 seconds with an indicator which moves around it, thus setting the fuze. Joining the outer cover and fuze body is a red sealing disc.

OPERATION:

When the flare is put in the plane the indicator on the side is set at the desired de-lay, and when it is released the safety pin and vane cap are removed. As the flare falls the vanes rotate the arming spindle out and allow the ball retaining cap to be moved away by the pressure of the ball holding up the spring loaded striker. The striker is them freed and hits the percussion cap which flashes down and fires both the vent hole pellet and the primary powder pellet. The products of combustion break the seal of the vent hole in the delay fuze. This burns in a clockwise direction and flashes through the fire hole into the lower fuze body and along the long powder pellets and fires the maga-zine.

REMARKS:

(1) Mk III time setting disc is calibrated from 0 - 70 seconds includes a safety set-ting.