8th Year Type torpedo

8th Year Type torpedo
The Mutsuki class were the first ships equipping this torpedo
Type	Torpedo
Place of origin	Empire of Japan
Service history
In service	1920
Used by	Imperial Japanese Navy
Wars	Second World War
Production history
Designed	1919
Manufacturer	Kure, Yokosuka and Sasebo Naval Arsenals
Specifications
Mass	2,215 kg (4,883 lb) (N° 1) 2,362 kg (5,207 lb) (N° 2)
Length	8.485 m (27 ft 10.1 in)
Diameter	60.9 cm (24.0 in)
Effective firing range	10,000 m (11,000 yd) (at 38 knots)
Maximum firing range	20,000 m (22,000 yd) (at 28 knots)
Warhead	Shimose (picric acid)
Warhead weight	300 kg (660 lb) (N° 1) 346 kg (763 lb) (N° 2)
Engine	4-cylinder Schwarzkopff radial engine
Maximum speed	43 knots (80 km/h)

The "8th Year Type" (十二年式) was a 61 cm (24 in)-diameter torpedo of the Imperial Japanese Navy, launched from surface ships. It was later used as the template to develop the more advanced Type 90 torpedo. It was further derivatived in two variations, "Number 1" and "Number 2", having respectively a lighter and larger warheads.^[1]