Type 91 torpedo

The Type 91 was an aerial torpedo of the Imperial Japanese Navy which was designed to be launched from an aircraft. It was used in naval battles in World War II.

The Type 91 aerial torpedo had two unique characteristics:

This system made it possible to release the Type 91 not only at a cruising speed of 180 knots (or 333 km/h, 207 mile/h) at an altitude of 20 m (66 ft), but also in a power-glide torpedo-bombing run at the Nakajima B5N2 Kate's maximum speed of 204 knots (or 378 km/h, 234 mile/h).

The Type 91 torpedo was 450 mm (17¾ in) diameter. There were five models put into service, with high explosive warheads weighing 213.5 kg to 526.0 kg (or 470.7 lb to 1160 lb) and having effective ranges of 1,500 m to 2,000 m (or 1,640 yd to 2,187 yd) at 42 knots (77.8 km/h or 48.34 mph).