At the end of last year we looked at a 1960s parachute illuminating mortar bomb here. Tonight we are looking at a second example of the parachute flare mortar bomb, this time however it is a wartime example and is far more complete than the previous one:Unlike later bombs, this example is painted black, with yellow lettering stencilled on the outside:The thin metal cap that covers the end is still extant on this bomb, and is stamped with a date of 1940:The end cap is also wartime dated, here it is 1942:The FD stands for Fry’s Die Castings Ltd, of London, who manufactured the component. The distinctive holes for a parachute illuminating bomb can be seen directly above the tail of the mortar bomb:These had closing discs over them originally which burnt away when the bomb was fired. Inside the bomb originally would have been a parachute, flare canister and small bursting charge:Unusually this bomb still has the parachute:And the burnt out remains of the flare:The 1959 mortar manual describes its operation:
The flash from the cartridge, when fired, penetrates the closing discs and ignites a delay charge; this in turn ignites a bursting charge of gunpowder which ignites and ejects the flare; a small parachute, packed in the nose of the bomb, is attached to the flare and is ejected at the same time, opening at once and suspending the flare below it.
The pamphlet also gives some guidance on the use of these bombs:
- These bombs contain a flare attached to a parachute. When the bomb is fired at an angle of 80 degrees the parachute is ejected at a height of about 600 feet. At this height the flare gives its best performance. It will burn for about 30 seconds, descending slowly and drifting with the wind as it does so.
- In still air or light winds the mortar should be fired at an angle of 80 degrees. This will allow the flare to be ejected at a distance of about 100 to 150 yards from the mortar position. If light is required at a greater distance the angle must be lessened as when firing smoke bombs. At its reduced height the flare will not light up so big an area.
- Whenever possible place the flare behind the enemy, as this will silhouette him against the light. To avoid our own troops being silhouetted against the light, care must be taken, especially in head winds, to ensure that flares do not drift behind our forward positions. Do not, if it can be avoided, place the flare between the enemy and our own troops as its effect will be to dazzle the defenders thus placing them at a disadvantage.
- When the wind is strong the firer will have to judge its effect and alter the angle of the mortar according to where the light is required. The principle is to fire the bomb up wind, allowing the flare to drift over the area where light is required.
- Although the flare is efficient and will light up the battlefield a good distance in front of the platoon position, its uncontrolled use may also show up the activities of our own troops. Orders will be given when flares at platoon level are not to be fired.