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The Mark 1, and later the Mark 1A, Fire Control Computer was a component of the Mark 37 Gun Fire Control System deployed by the United States Navy during World War II and up to 1991 and possibly later. It was originally developed by Hannibal C. Ford of the Ford Instrument Company [1] and William Newell.
Work on this design began in 1935 and production commenced in 1943. 1.9 meters long, the bomb is an armor-piercing design, with a thick forged steel nose. The bomb attained a speed of about 100 meters per second when launched. The principal drawback was the small 3.5-kilogram bursting charge. Type 5 No.1 Mk 9 Mod 1 15 kg (33 lb)
A mouse trap type electrical impact fuze, 1 second delay, detonation sets off filler M228 M69 Training fuze with functional fuze to train on the 4–5 second delay C12 M25/A1/A2 Integral detonating fuze, 1.4–3 second delay, detonator bursts body scattering agent M200/A1 M6/A1, M7, M8, M14, M16, M18 A mouse trap type igniting fuze.
The outputs of the Mark 1A were the same (gun bearing and elevation), except fuze time was added. The fuze time was needed because the ideal of directly hitting the fast moving aircraft with the projectile was impractical. With fuze time set into the shell, it was hoped that it would explode near enough to the target to destroy it with the ...
The MK 1 is a time-fused fragmentation grenade and has 32 serrations on it. To start the fuse, the user has to pull the safety pin, then push off the cap on top of the grenade. Right before throwing, the user has to move the switch on the lever away from the grenade in order to start the fuse.
The Mk 7 Mods 3, 4, and 6 bomb dispensers have the Mk 339 Mod 1 fuze, which provides the pilot with in-flight selection of the fuze function time. The Mk 7 Mod 4 bomb dispenser differs from the Mk 7 Mod 3 by modifying the dispenser and giving interface capabilities with a wider range of military aircraft.
Figure 1: The Ford Mk 1 Ballistic Computer. The name "rangekeeper" began to become inadequate to describe the increasingly complicated functions of rangekeeper. The Mk 1 Ballistic Computer was the first rangekeeper that was referred to as a computer. Note the three pistol grips in the foreground, which are the firing keys of the main guns.
It consists of an electronic programmable fuze, a pre-fragmented warhead and a propulsion system. The fuze is programmed through the fire control of the gun. The fuze is mechanically armed at approximately 23 meters. The round is programmed to airburst over the target and the fuze counts down the programmed time via its built in electronics.