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- The Ho-301 was a Japanese 40 millimeter caliber autocannon that saw limited use during World War II, on Japanese Army Nakajima Ki-44 and Kawasaki Ki-45 KAI aircraft. It was unusual in using caseless ammunition. Although the effective range of the cannon was only 150 meters (490 ft), the Ho-301 was light and rapid-firing for its caliber. The caseless design revolved around a specially designed projectile, that was in effect a small rocket. The round used an internal propellant chamber at the rear of the projectile containing a ten gram silk bag filled with smokeless powder. Drilled into the base plate of the round are twelve 3.8 millimeter diameter exhaust holes. The propellant chamber is sealed by a thin aluminum sealing cup, which covers the exhaust holes. When the primer is struck, the bag of propellant ignites, and the pressure rises until the aluminum cup bursts, allowing the exhaust gas to rush through the exhaust holes pushing the projectile forward. The propellant was exhausted before the projectile left the barrel. Because of the low muzzle velocity (245 meters/second or about 804 ft/sec - equivalent to a moderately powerful air rifle) the weapon was only suited to attacking bombers; even here the extremely low muzzle velocity made it difficult to achieve hits from any position besides directly astern the target aircraft and well within the range of defensive counterfire. The modern Russian VOG grenades fired by the GP-25 grenade-launcher use a similar principle. (en)
- ホ301/ホ三〇一は、大日本帝国陸軍の航空機関砲。 (ja)
- Działko Ho-301 – japońskie działko lotnicze kalibru 40 mm z okresu II wojny światowej. Broń używana była w niektórych wersjach samolotów Nakajima Ki-44. Działko Ho-301 jest jak do tej pory jedynym użytym bojowo działkiem na amunicję bezłuskową. (pl)
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- 49000.000000 (xsd:double)
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- 3516 (xsd:nonNegativeInteger)
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- A cutaway, showing the 40 mm caseless projectile. (en)
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- ホ301/ホ三〇一は、大日本帝国陸軍の航空機関砲。 (ja)
- Działko Ho-301 – japońskie działko lotnicze kalibru 40 mm z okresu II wojny światowej. Broń używana była w niektórych wersjach samolotów Nakajima Ki-44. Działko Ho-301 jest jak do tej pory jedynym użytym bojowo działkiem na amunicję bezłuskową. (pl)
- The Ho-301 was a Japanese 40 millimeter caliber autocannon that saw limited use during World War II, on Japanese Army Nakajima Ki-44 and Kawasaki Ki-45 KAI aircraft. It was unusual in using caseless ammunition. Although the effective range of the cannon was only 150 meters (490 ft), the Ho-301 was light and rapid-firing for its caliber. The modern Russian VOG grenades fired by the GP-25 grenade-launcher use a similar principle. (en)
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- Ho-301 cannon (en)
- ホ301 (ja)
- Działko Ho-301 (pl)
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