| Ho-401 cannon | |
|---|---|
| Type | Aircraft cannon |
| Place of origin | Imperial Japanese army |
| Service history | |
| Wars | World War II |
| Specifications | |
| Mass | 150 kg (330 lb) |
| Length | 2,000 mm (79 in) |
| Barrel length | 800 mm (31 in) |
| Cartridge | 57 x 121R (1,550 g) |
| Calibre | 57 mm (2.2 in) |
| Action | Short recoil-operated |
| Rate of fire | 80 rounds/min |
| Muzzle velocity | 495 m/s (1,620 ft/s) |
| Feed system | 16-round drum |
Ho-401 was a Japanese aircraft autocannon that saw limited, if any, use during World War II. It was a large-caliber version of the 37 mm Ho-203 cannon. The cannon was used on the ground-attack, Kawasaki Ki-102b heavy fighter of the Imperial Japanese Army Air Force.[1]