Nakajima Ki-84 Hayate RC plane plans

Materials: XPS foam 3 and 5mm 1050x500 (or Depron 3mm, 6mm);UHU Por glue
Balsa wood 4x4mm
Aircraft Birch Plywood 1.5mm
Basswood Plywood 2mm
Wingspan: 1000mm (40")
Flying Weight: ≈440g (if the foam density is 30kg/m³ )
Motor: X2305 KV1450 (25g)
Propeller: 1047
Receiver: FrSky S6R (12g)
ESC: SunnySky X 18A (9g)
Servos:EMAX ES08D II (9g) x 4 ,
LiHV battery: 1100mah 2S 7.6V
Retractable Landing Gear (25g)
Stainless Steel Spring Wire 2 mm
Brass tubes 3 mm
Wheels 2"
Tail wheel 19mm
Neodymium magnets 3x5mm
Carbon Strips: 0.5mm x 3mm
Carbon push rods: 500x2x1mm
Hinge Linker (24mm):
Nylon Control Horn with Clevis (0,52+0,34g):
Control Horn (0,5g)
Transparent plastic screws 4x45
Small Nylon screws: 2mm and 2,5mm for retracts mount
Nylon hex socket screws: M4x8mm for Spinner

Printable templates and Laser Cut files

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Paper printable plans

How to Make tutorial video

Nakajima Ki-84 Hayate History

At the end of 1941, the Army Aviation Headquarters handed over to Nakajima the technical and tactical requirements for a new fighter to replace the Ki-43 and Ki-44 planes in the future. It was to be an all-metal low-wing aircraft with an armored cockpit, with a speed of over 650 km / h, rising to an altitude of 5,000 m in 4.5 minutes. It was to be armed with two 20 mm cannons and two 12.7 mm machine guns.

In order to meet such excessive requirements, the Nakajima plant established a construction team led by engineer Yasushi Koyama, who was a co-creator of the earlier types of Japanese fighters (Ki-27, Ki-43 and Ki-44). A year later, the design work was completed, and at the end of March 1943, the Nakajima plant in Ota built the first prototype. The new plane was designated Ki-84 and called Hayate, which means a sudden, strong, gusty wind. The Allies gave him their code name - Frank.

Flight tests showed, inter alia, lower speed than required (due to problems with the engine, the speed did not exceed 624 km / h), but the plane turned out to be the fastest Japanese fighter. Despite lower performance than specified in the technical conditions of the contract, the army placed an order for an information party (83 copies). In the course of production, numerous improvements were made to improve performance, one of the information batch cars reached the speed of 634 km / h. The production itself, thanks to the well-thought-out design of the airframe, ran quite smoothly. The produced planes were initially sent to research centers, later - when there were more of them - they were directed to a special unit in Akeno, the purpose of which was to train future piloting instructors and to develop an effective combat tactic on this plane.

In March 1944, the first Ki-84s went to 22 Sentai based in Fussa. On August 22, Sentai flew to Hank, China. A few days later, she fought her first fight with US fighters from the 14th Air Force, achieving her first victory. During 6 weeks of combat, 22 Sentai shot down about 40 USAF planes with the loss of 5 pilots and about 10 planes. Such a good result confirmed the Supreme Command's belief that the Ki-84 is an excellent fighter. In March 1944, Hayate went to the 11th Sentai, and in April 2 more units were rearmed and the formation of new ones began. In 1944-45 about 30 units fought on the Hayate, from China to the defense of the Japanese Islands.

When assessing the Ki-84, it should be said that it was a very successful, fast and heavily armed fighter, and at the same time easy and pleasant to pilot. Japanese pilots achieved many victories on it, for example, Major Sergeant Satoshi Anabuki (the army's top ace with 51 kills, 39 of which are confirmed) achieved his last 6 victories on Hayate. Another Japanese ace - senior sergeant Isamu Sasaki (38 victories) - knocked down 6 B-29 Superfortress bombers on the Ki-84, including 3 B-29s during one night fight. On January 7, 1945, sergeant M. Fukuda attacked 4 P-38s fighting a lone Ki-43. Hayate shot down one of the opponents with an accurate series. Another P-38 shot by Fukuda hid in the clouds while smoking and returned to the base. The second P-38 piloted by Major Thomas McGuire, one of the leading USAAF aces, also failed to return from this flight. His Lighting crashed at the very beginning of the fight with Oscar due to the loss of speed and control during a sharp turn (he did not throw away additional fuel tanks). In addition to the spectacular victories, there were also losses, caused mainly by the overwhelming advantage of the Allies sending hundreds of Mustangs, Thunderbolts and Lightings to fight by the hands of well-trained pilots. On the other hand, the unreliability of the Ha-45 engine, the poor quality of some components and the increasingly poor training of the majority of Japanese pilots resulted in high non-operational losses, e.g. in November 1944, 80 Ki-84 were launched from Japan with the task of strengthening units stationed in the Philippines to the target Only 14. The remaining ones, due to engine failures, turned back from the route or remained inoperative at intermediate airports. However, a fully operational Hayate in the hands of an experienced pilot was a very formidable opponent. Comparative tests of the captured Ki-84 with the P-47N and P-51D in the USA showed that the Hayate with a well-tuned engine and using the American 140-octane fuel slightly exceeded its opponents in horizontal speed (687 km / h at an altitude of 6100 m), had better climb and was more maneuverable. However, it should be emphasized that the 140-octane fuel was unavailable for the Japanese during the war, and the 95-octane fuel used allowed for a speed of about 630 km / h. It does not change the fact that the Ki-84 is considered the best Japanese fighter of the Second World War.