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The Curta was conceived by Curt Herzstark in the 1930s in Vienna, Austria.By 1938, he had filed a key patent, covering his complemented stepped drum. [3] [4] This single drum replaced the multiple drums, typically around 10 or so, of contemporary calculators, and it enabled not only addition, but subtraction through nines complement math, essentially subtracting by adding.
In 2015, the United States planned to procure 7,474 rounds with a FY 2015 total program cost of US$1.9341 billion at an average cost of US$258,777 per unit. [6] By 2016, unit costs were reduced to US$68,000 per round. [7] Versions that add laser-guidance capability and are designed to be fired from naval guns began testing in 2015.
The round was designed with a possible military need for a cartridge for anti-personnel, anti-sniper, and anti-materiel roles with a (supersonic) precision range of 2,200 yards (2,000 m). It is offered as a competitor to the most common military NATO long-range service cartridges, such as .338 Lapua Magnum and the .50 BMG .
The resulting muzzle energy is 12.1 MJ (8.9 million ft⋅lbf) The penetration as per the Lanz Odermatt calculator is about a total penetration of 680-millimeters (26.7717 in) up to possibly 720-millimetres of RHA to account for any discrepancies in measurement. The M829A3 is only used for training with a switched plastic sabot round.
The 19.3 g (298 gr) LM-107 projectile design is 59 millimetres (2.3 in) long and has a Haack profiled nose and an Adams profiled tail. The rifling twist rate for the .343 Lapua Magnum LM-107 wildcat cartridge was chosen at 180 mm (1:7 inch), Ø lands = 8.72 mm, Ø grooves = 8.45 mm and loaded with the LM-107 projectile has a cartridge overall ...
It is a suitable round for engaging helicopters, aircraft and lightly armored vehicles, as well as unarmored vehicles, and it is capable of igniting jet fuel. The Mk 211 has about the same destructive power as a standard 20mm round against such targets and can penetrate 11 mm of RHA at 45° from a range of 1000 meters. [4]
Cross section of AHEAD 35 mm ammunition. Advanced hit efficiency and destruction (AHEAD) ammunition [1] is a type of airburst round ammunition that releases a cloud of sub-projectiles just ahead of a target, enabling it to engage conventional as well as low, slow and small (LSS) air threats including unmanned aerial vehicles and perform counter rocket, artillery, and mortar duties.
The round includes a high explosive and incendiary component and can also defeat light armor (hence its multi-purpose designation). [1] The self-destruct feature engages at approximately 2,300 metres (7,500 ft) [2] and destroys the round, preventing it from falling back to earth and inflicting damage to the surrounding territory. The price per ...