Military Factory logo
Icon of F-15 Eagle military combat fighter aircraft
Icon of Abrams Main Battle Tank
Icon of navy warships
Icon of AK-47 assault rifle

Nakajima Ki-84 Hayate (Frank)

Single-Seat, Single Engine Monoplane Fighter Aircraft

The Nakajima Ki-84 Hayate was one of the more important Japanese fighters heading into the final year of World War 2.
Authored By: Staff Writer | Edited: 3/22/2018
National Flag Graphic


Year: 1944
Status: Retired, Out-of-Service
Manufacturer(s): Nakajima - Japanese Empire
Production: 3,500
Capabilities: Fighter;
Crew: 1
Length: 32.55 ft (9.92 m)
Width: 36.88 ft (11.24 m)
Height: 11.12 ft (3.39 m)
Weight (Empty): 5,864 lb (2,660 kg)
Weight (MTOW): 8,576 lb (3,890 kg)
Power: 1 x Nakajima Ha-45 radial piston engine developing 1,800 horsepower.
Speed: 392 mph (631 kph; 341 kts)
Ceiling: 34,449 feet (10,500 m; 6.52 miles)
Range: 1,053 miles (1,695 km; 915 nm)
Rate-of-Climb: 2,780 ft/min (847 m/min)
Operators: Imperial Japan
Out of the many fine fighters available to the Japanese Army in the closing months of World War 2, none were of greater import than the arrival of the Nakajima Ki-84 Hayate (meaning "gale" and known as "Frank" to the Allies. The single engine fighter was a respected performer capable matching up against the Allied North American Mustangs while fielding enough firepower to take down the high-flying and well-defended Boeing B-29 Superfortresses. Though Japan had developed various capable platforms towards the end of the war, the Ki-84 Hayate was really one of the only designs to ever see production quantities of note, for some 3,500 examples were produced up until the final days of the war - this production covering just about a year and a half.

Like all late-stage Japanese fighter designs, the Hayate was designed with superior views from the cockpit, a powerful and proven engine, slender and aerodynamic fuselage and armament consisting of a mix of machine gun and cannon. The heart of the system was a Nakajima-brand Ha-45 type radial piston engine capable of delivering some 1,800 horsepower. The engine allowed for a top speed of nearly 400 miles per hour, a service ceiling of close to 35,000 feet and an operational range of just over 1,000 miles. Additionally, the airframe and powerplant proved the Ki-84 to be quite maneuverable in a dogfight even when sparring against the best American counterparts. Base armament of early models included a 2 x 12.7mm machine gun array in the upper forward fuselage part of the nose and 2 x 20mm cannons buried in the wings. Later models - in particular the Ki-84-III "bomber destroyer" - would sport an even more impressive 2 x 20mm cannon setup in the fuselage nose and 2 x 30mm cannons in the wings. Bombs could also be carried under wing and would be of the 551lb variety.

Ultimately, the avoidance of the Allied bombing campaign became impossible and as such, production and resources were in short supply. The number of Hayates in service performed admirably yet those in service were in such constant use that the series suffered reliability issues as a whole. Despite this, the Nakajima Ki-84 was of a stellar design and, given more in the way of numbers and time, might have made more of an impact in defense of Japan. The Ki-84 was in service until the last few days of the conflict.


2 x 12.7mm Ho-103 machine guns in fuselage nose
2 x 20mm Ho-5 cannons in wings

2 x 551lb bombs under wings

Graphical image of an aircraft medium machine gun
Graphical image of an aircraft heavy machine gun
Graphical image of an aircrat automatic cannon
Graphical image of an aircraft conventional drop bomb munition

Variants / Models

• Ki-84-I - Base Series Designation
• Ki-84-Ia - Fitted with Nakajima Ha-45 radial piston engine of 1,800hp; 2 x 12.7mm machine guns in nose and 2 x 20mm cannons in wings.
• Ki-84-Ib
• Ki-84-Ic - Converted Dedicated "Bomber Destroyer" Variant; fitted with 2 x 20mm nose cannon (in place of the standard 12.7mm machine guns) and 2 x 30mm wing cannons.
• Ki-84-II
• Ki-116 - Final Production Series Model; based on the Ki-84-Ia model.
Site Disclaimer  |  Privacy Policy  |  Cookies  |  Site Map Site content ©2003-, All Rights Reserved.

The "Military Factory" name and logo are registered ® U.S. trademarks protected by all applicable domestic and international intellectual property laws. All written content, illustrations, and photography are unique to this website (unless where indicated) and not for reuse/reproduction in any form. Material presented throughout this website is for historical and entertainment value only and should not to be construed as usable for hardware restoration, maintenance, or general operation. We do not sell any of the items showcased on this site. Please direct all other inquiries to militaryfactory AT

Part of a network of sites that includes, GlobalFirepower, a data-driven property used in ranking the top military powers of the world, and, the World Directory of Modern Military Aircraft.

Facebook Logo YouTube Logo