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102 mm (4.0 in) BL 4 inch Mk VIII & XI 40-caliber United Kingdom: World War I - World War II 102 mm (4.0 in) BL 4 inch Mk IX naval gun 45-caliber United Kingdom: World War I - World War II 102 mm (4.0 in) QF 4 inch Mk I - III 40-caliber United Kingdom: 1895 - World War I 102 mm (4.0 in) QF 4 inch Mk IV, XII, XXII 40-caliber United Kingdom
The Hydra 70 rocket is an American made 2.75-inch (70 mm) diameter fin-stabilized unguided rocket used primarily in the air-to-ground role. It can be equipped with a variety of warheads, and in more recent versions, guidance systems for point attacks.
However, the 3 + 1 ⁄ 2-inch (89 mm) 12-gauge shell, with its higher SAAMI pressure rating of 14,000 psi (97 MPa) compared to standard 2 + 3 ⁄ 4-inch (70 mm) and 3-inch (76 mm) 12-gauge shells with their lower pressure rating of 11,500 psi (79 MPa), began to approach the performance of the 3 + 1 ⁄ 2-inch (89 mm) 10-gauge shells with a ...
The 70 mm film is perforated at the same pitch (0.187 inch, 4.75 mm) as standard 35 mm film. With a five-perforation pull-down, the Todd-AO system provides a frame dimension of 1.912 inch (48.56 mm) by 0.87 inch (22.09 mm) giving an aspect ratio of 2.2:1.
It was 2.75 inches (70 mm) in diameter. Designed as an air-to-air weapon for interceptor aircraft to shoot down enemy bombers , it primarily saw service as an air-to-surface weapon. The FFAR has been developed into the modern Hydra 70 series, which is still in service.
The weapon bridges the gap between the Hydra 70 and AGM-114 Hellfire systems and provides a cost-effective method of engaging lightly armored point targets. APKWS is the U.S. government's only Program of Record for the semi-active, laser-guided 2.75 inches (70 mm) rocket. [8]
The Mark 2, Nos. 3 – 70, was a 40 caliber naval gun that fired semi-fixed ammunition. The Mark 2 consisted of tube, jacket, and 2 hoops, being hooped to 68.5 inches (1,740 mm) from the muzzle.
Unlike the later Todd-AO system (which printed onto 70mm film), Grandeur did not use the same perforations as 35mm film, but instead had larger perforations on a longer pitch of 0.234 inch (5.95 mm) compared to the 0.187 inch (4.75 mm) pitch used by both 35 mm film and modern 70 mm film. Although Grandeur used a four perforation pulldown (i.e ...