Nakajima (Ki.84-1-ko) Army Type 4 Fighter Model 1-ko
Hayate specification;
Power plant: One Nakajima (Ha-45-21)Army type 4 Model 21 188-cylinder radial air-cooled engine rated at 2,000 hp at 3,000 rpm for take-off, 1,860 hp at 3,000 rpm at 5,905 ft (1 800 m) and 1,620 hp at 3,000 rpm at 20,995 ft (6 400 m). driving four-bladed constant-speed electrically-operated Pc-32 propeller of 10 ft 2 in (3.10m) diam. Total internal fuel capacity of 153 lmp gal (697 1) distributed between one 47.7 lmp gal (217 l) fuselage tank, two 40 lmp gal (173 l) wing centre section tanks and two 14.7 lmp gal (67 l) outboard wing leading-edge tanks.
Performance: (At 7,965 lb/3613 kg with 124 lmp gal/563 1 (fuel) Max speed, 325 mph (523 km/h) at sea level, 362 mph (582km/h) at 9,840 ft (3000 m), 388 mph (624 km/h) at 21,325 ft (6,500 m). 374 mph (602 km/h) at 29,530 ft (9000 m), 340 mph (547 km/h) at 34,450 ft (10 500 m); normal cruise, 236 mph (380 km/h) at 19,685 ft (6000 m), initial climb rate, 3,790 ft/min (19.25 m/sec); time to 16,405 ft (5000 m), 6:42 min. to 26,245 ft (8 000 m), 11:66 min; service ceiling, 36,090 ft (1 000 m); range (full internal fuel) at 1 640 ft (500 m), 1,025 mls (1 650 km) at 178 mph (286 km/h), 780 mls (1 255 km) at 254 mph (408 km/h), with two 44 lmp gal (200 l) drop tanks, 1,815 mls (2920 km) at 173 mph (278 km/h), 1,410 mls (2 270 km) at 241 mph (388 km/h); stalling speed (flaps down), 86 mph (138 km/h).
Weights: Empty equipped, 5,864 lb (2 660 kg); normal loaded (full internal fuel), 8,192 lb (3 716 kg); max overload, 9,195 lb (4171 kg).
Dimensions: Span. 36 ft. 2 in. (11.24 m); length 32 ft 6-1/2 in (9.92 m); height, 11 ft 1 in (3.38 m); wing area, 226-04 sq. ft (21.0 m2).
Armament: Two fuselage-mounted 13-mm Ho-103 machine guns with 350 rpg and two wing-mounted 20-mm Hol-5 cannon with 150 rpg. Provision for two 66-lb (30-kg), 220-lb (100-kg) or two 551-lb (250-kg)bombs on underwing racks.
Is this the kind of info you are looking for?
This info was from a test conducted at Wright Field, Dayton, Ohio. The Ki-84 also didn't have rudder and aileron trimming which hampered the execution of well-coordinated manuevers. And I qoute from one of the test pilot(s?) "It was quickly ascertained that, in genral, the handling and control characteristics of the Hayate were superior to those of comparable US fighters and particulary in the low speed regime." Also, "It was concluded from the test programme carried out at Wright Field that Hayate was essentially a good fighter which compared favourably with the P-51H Mustang and the P-47N Thunderbolt. It could out-climb and out-manuever both USAAF fighters, turning inside them with ease, but both the P-51H and P-47N enjoyed higher diving speeds and marginally higher top speeds. The light power loading and control forces of the Japanese fighter were something to be admired, but it was not so well constructed as its US contemporaries, perhaps reflecting the slipping of Japanese production standards at the stage of the war; it was obviously incapable of standing up so well as US fighters under continual usage and it was more demanding on maintenance."
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1./Jagdgeschwader 51 "Mölders"