![]() ![]() Type 91 history Īichi B7A Ryusei carrying torpedo with cross type tail stabilizer plates, 1945 Chronological Table 1931 – Type 91 aerial torpedo is put into service, production begins. However, the Type 91 aerial torpedo project members did not regard it as a part of the Type 91 series. It would have been the largest aerial torpedo in the Imperial Japanese Navy Air Force, but the operating concept became outdated and the project was never completed. This was an enlarged version of the Type 91 aerial torpedo and was 533 mm (21.0 in) in diameter, 7.10 m (23.3 ft) long, weighing 2,070 kg (4,560 lb), and carrying a 750 kg (1,650 lb) warhead. In spring 1944, the Yokosuka air arsenal began development of the Shisei Gyorai M (trial model torpedo M), or simply the Two tonne torpedo. Later, heavier models had a decreased range. There were two versions in the Type 91 warhead rev.3, differing in designed maximum launch speeds. Wooden fins and a softwood breakaway nose cone were added to allow for launching into shallow water at low altitudes. The Type 91 (modification 2), was a shallow-water aerial torpedo that was designed for and used in the attack on Pearl Harbor in 1941. Warhead designed to breach the armor of US battleships Precision forging and stainless steel cast body ![]() Supported shedding wooden tail-plates in 1936, first model considered for German LT 850 versionīody reinforced in 1938, anti-rolling controller added in 1941, 2nd version considered for German LT 850 version Type 91 Aerial Torpedo and Type 91 Warhead, operational models Variants īelow is the list of the series of Type 91 aerial torpedo production models. A slight variant was used to sink HMS Prince of Wales and HMS Repulse, launched from Mitsubishi G4M "Betty" bombers in an action in the South China Sea three days after Pearl Harbor on December 10, 1941. The torpedo measured 5.5 m (18 ft) in length, with a diameter of 450 mm (18 in), and weighed 835 kg (1,841 lb), with an explosive charge of 205 kg (452 lb). Surface warships and submarines used other types of torpedoes, namely the Type 93 and Type 95 respectively, while the Type 97 torpedo was designed for use by midget submarines. ![]() Since the Type 91 torpedo was the only practical aerial torpedo of the Imperial Japanese Navy, it was simply known as the Koku Gyorai, or aerial torpedo. There were five models put into service, with high-explosive warheads weighing 213.5 to 526.0 kg (471 to 1,160 lb) and having effective ranges of 1,500 to 2,000 m (1,600 to 2,200 yd) at 78 km/h (42 kn). The Type 91 torpedo was 450 mm (18 in) in diameter. This system made it possible to release the Type 91 not only at a cruising speed of 330 km/h (180 kn) at an altitude of 20 m (66 ft), but also in a power-glide torpedo-bombing run at the maximum speed of the Nakajima B5N or Kate, 378 km/h (204 kn) Secondly, it engaged an angular acceleration control system to control rolling movements, which was very advanced for its time. Firstly, it used wooden stabilizers attached to the tail fins which were shed upon water entry. The Type 91 aerial torpedo had two unique characteristics. It was used in naval battles in World War II and was specially developed for attacks on ships in shallow harbours. The Type 91 was an aerial torpedo of the Imperial Japanese Navy. Single-engine carrier-based attack aircraft, twin-engine land-based attack aircraft ![]()
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