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| rdfs:comment | - 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:
* Wooden attachments on the tail fins, that acted as aerodynamic stabilizers, which were shed upon water entry.
* An angular acceleration control system (PID controller) to control rolling movements, which was very advanced for its time.
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| is explosive | |
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| steering | - gyrocompass guided vertical rudder control system, gyroscope guided anti-rolling controller system
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| Caption | - Type 91 torpedoes aboard an aircraft carrier.
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| launch platform | - single-engine carrier-based attack aircraft, twin-engine land-based attack aircraft
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| Engine | - wet-heater type, 8-cylinder radial engine
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| Designer | - Rear Admiral Shoji Naruse and his team
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| abstract | - 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:
* Wooden attachments on the tail fins, that acted as aerodynamic stabilizers, which were shed upon water entry.
* An angular acceleration control system (PID controller) to control rolling movements, which was very advanced for its time. 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'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 (or 77.8 km/h). 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. Surface warships and submarines used other types of torpedo, namely the Type 93 and Type 95 respectively, while the Type 97 torpedo was designed for use by midget submarines.
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