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During 1942 Watanabe designed an ASW aircraft to meet an Imperial Japanese Navy requirement for a specialized aircraft in this category. Designated Kyushu Q1W, this was a cantilever mid/low-wing monoplane with retractable tailwheel landing gear, and powered by two Hitachi GK2C Amakaze 31 radial engines. Operated by a crew of three, the Q1W was planned to use an advanced search radar, but this failed to materialize and instead the Q1W had to make do with an earlier and somewhat ineffective radar complemented by MAD (magnetic anomaly detection) equipment. First flown in September 1943, the Q1W1 was ordered into production in early 1944 as the Navy Patrol Plane Tokai (eastern sea), later allocated the Allied codename 'Lorna'. It proved to be unsuccessful in operational service, too slow and too vulnerable to attack by Allied fighters, and only about 150 had been built by the time the Pacific war ended.
| MODEL | Q1W1 |
| CREW | 3 |
| ENGINE | 2 x Hitachi GK2C "Amakaze-31", 460kW |
| WEIGHTS |
| Take-off weight | 4800-5318 kg | 10582 - 11724 lb |
| Empty weight | 3102 kg | 6839 lb |
| DIMENSIONS |
| Wingspan | 16 m | 52 ft 6 in |
| Length | 12.1 m | 39 ft 8 in |
| Height | 4.1 m | 13 ft 5 in |
| Wing area | 38.2 m2 | 411.18 sq ft |
| PERFORMANCE |
| Max. speed | 320 km/h | 199 mph |
| Cruise speed | 240 km/h | 149 mph |
| Ceiling | 4490 m | 14750 ft |
| Range | 1340 km | 833 miles |
| ARMAMENT | 1-2 20mm cannons, 7.7mm machine-guns, 500kg of bombs |
 | A three-view drawing (752 x 947) |
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