4-in. Training Flare Mks I, III, IV, VII, and VIII, and 4-in. Reconnaissance Flare, A.S., Mks I and II [Service)
No Image Available Filler and Weight
NA,
Body and Overall Weight
NA, NA
Color
Black with red band near nose
Type of Round, DODIC
Training Flare, NA
Description:
The 4 in. Training Flare Body Mk IV comprises a front body portion containing a Flare candle and a pull percussion igniter, and a rear body portion containing an 11-ft. cotton parachute, which is connected with the candle unit. The front and rear body portions are connetted by a diaphragm, which closes one end of the front body and supports the flare candle and igniter. Two suspension bolts on the diaphragm provide an anchorage for the parachute, the opposite end of the front body is closed by a millboard disc held in place by a fusible closing disc. In addition to the igniter plug, the igniter comprises an igniter body, which houses a striker mechanism, and into which the igniter plug is screwed. The igniter body is held in place in the central tube by a retaining plate. The A.S. Reconnaissance Flare is identical to the Training Flare except for a delay fuze below the igniter, which gives about a 5-second delay before burning starts.
Use:
The 4-in. Training Flare Body Mk IV comprises a front body portion containing a flare candle and a pull percussion igniter, and a rear body portion containing an 11-ft. cotton parachute, which is connected with the candle unit.
Functioning:
When the flare is released, the long static cord, the free end of which has been attached to the rear crutch holder of the carrier or to the eyebolt on the lid of the launching chute, is withdrawn from the elastic loop and pulls the retaining pin out of the loop on one of the flaps, thus releasing all flaps. The flare falls, with the parachute being drawn out of the body because of the connection between the short static cord and the long cord attached to the plane. Tautening of the auxiliary static cord breaks the thin braided cord, separating the flare from the cord attached to the plane. After the chute has opened, the body of the flare continues momentarily to fall freely until the suspension rope is fully tensioned. The jerk as the suspension rope tightens causes the securing wire to bend and the clutch to be pulled out, spring-loading and releasing the striker-The striker, when released, moves downwards and fires the percussion cap, This flash ignites the gunpowder in the training flare, sending a flash down the center tube by the primed cambric tube, igniting the burster charge. (A percussion cap ignites the safety fuse in the A.S. flare.) The flash from the burster charge passes through the holes in the aperture washer and ignites the primed cambric -washer and the priming composition at the bottom of the flare candle. The priming composition ignites the flare composition, being assisted by the six portions of igniter composition which ensure a substantially even ignition of the flare composition. The fusible closing disc at the nose of the flare melts and permits the candle to burn freely.
Munition Components:
  • Fuze Pull-percussion igniter
  • Fuze Pull-percussion igniter
  • Fuze Pull-percussion igniter
Data Source:
OP 1665 Explosive Ordnance British
Munitions Tech Data Sheet:
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