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l.B. 30-lb., Type J, Mk I (Service) |
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Filler and Weight | ||
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| NA, | |||
| Body and Overall Weight | |||
| Steel, 31 lb | |||
| Color | |||
| Dull red, Bright red band | |||
| Type of Round, DODIC | |||
| I.B., J, Mk I, NA |
| Description: |
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| The bomb consists of a cylindrical steel body with a dished steel nose plate having a central spigot welded on, a steel ring welded to the nose plate, and a wooden nose covered by a thin metal cap and secured by screws to the ring. A tail plate is welded, near the other end of the body, and a steel central tube, projecting through the tail plate, is welded to the tail plate and the spigot on the nose plate. A magnesium-alloy striker is screwed to the central tube and retain^ a detonator holder in position. The striker is supported by a two-armed brass cross which engages the top of the housing, A spring-loaded safety plunger, contained in a sleeve, projects into the path of the striker, The safety plunger is held in position by a retaining sleeve, which is secured to the parachute container. An automatic valve is fitted to the tail plate and has an auto-valve body screwed into a socket welded into the tail plate, A tube extension, strewed into the inner end of the auto-valve body, holds a flexible tube, which extends to within three inches of the bottom of the bomb. A jet having its outlet hole pointing ver¬tically out of the tail is screwed into the side of the auto-valve body. The value chamber houses a spring-loaded piston having a rubber sealing disk at its inner end, which normally seals the central hole in the valve body. The parachute is housed in a container held in the tail end of the bomb body by six retaining screws, and its rigging lines are anchored to the container. The container is closed by a loose metal cover held in position by the end plates of the cluster projectile. A safety pin retaining sleeve, secured to the cover, is fitted into a central guide tube in the parachute container, and houses a spring retainer in which is a compressed spring. |
| Use: |
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| Incendiary bombs of many various types, ranging in weight from 4 to 2o0 lb., are at pres¬ent in service use for operations against dif¬ferent types of targets. The Construction and filling of these bombs differ with the individual types, and no general description can be given here to cover the complete range. |
| Functioning: |
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| As the bomb falls free of the container, the spring in the spring retainer of the parachute container forces the cover away and releases the safety plunger, thus arming the bomb. The cover is blown aft and withdraws the parachute. When the parachute is fully with-drawn, the drag on the cover breaks the linen threads, RO that the cover falls away. On impact, tin- striker moves forward, bending the arms of the brass cross, and Arcs the detonator. The flash from the detonator passes through the paper disk covering the hole in the cellophane washer and ignites the priming in the central tube. The priming ignite the termite, and this heats the interior of the bomb, thus raising the internal pressure. The mag¬nesium-alloy striker housing burns away to afford additional -venting to the filling in the central tube. When the pressure has risen to about 300 p.s.i. (pounds per square inch), the piston in the automatic valve is raised and the methane and petrol solution passes through the flexible tube, into the valve chamber, through the outlet hole in the jet, and through the hole in the bottom of the parachute container. As it passes out of the jet, the liquid is ignited by the flame issuing from the vent holes in the striker housing as a result of the burning of the termite. Because of the lead weight, the free end of the flexible tube always falls to the. Lower side of the bomb as it comes to rest, so that almost all of the liquid charging passes out of the bomb through the jet. It emits a flame 15 ft. high and 2 ft. wide. |
| Munition Components: |
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| Data Source: |
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| OP 1665 Explosive Ordnance British |
| Munitions Tech Data Sheet: |
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