Aircraft Comparison By

Nakajima Ki-84 vs P-51 Mustang

Let’s have a bit of fun comparing two legendary birds of World War II, shall we? I’m talking about the Nakajima Ki-84 and the P-51 Mustang. Trust me, this is like comparing a samurai sword to a cowboy’s revolver – both epic in their own right!

Aircraft: Nakajima Ki-84 North American P-51 Mustang
Nakajima Ki-84
North American P 51 Mustang INA Macon Belle
Country: United States
Manufactured: from: 1944 to: 1945 from: 1940 to: 1945
ICAO: - P51
Price: $ million $0.59 million
Avionics: - -
Engine: 1x Nakajima Ha-45 radial piston 1x Packard (Rolls Royce) V-1650-7 Merlin
Engine Type: Piston Piston
Power: 1,800 horsepower 1,720 horsepower
Max Cruise Speed: 337 knots
624 Km/h
383 knots
709 Km/h
Approach Speed (Vref): - 87 knots
Travel Range: 1,815 Nautical Miles
3,361 Kilometers
1,434 Nautical Miles
2,656 Kilometers
Fuel Economy: - -
Service Ceiling: 36,090 feet 41,900 feet
Rate of Climb: 3790 feet / minute
19.25metre / second
3200 feet / minute
16.26metre / second
Take Off Distance: - 366 metre
1,200.77 feet
Landing Distance: - 457 metre
1,499.33 feet
Max Take Off Weight: 9,193 Kg
20,267 lbs
5,490 Kg
12,103 lbs
Max Landing Weight: - 5,490 Kg
12,103 lbs
Max Payload: - 910 Kg
2,006 lbs
Fuel Tank Capacity: 184 gallon
697 litre
269 gallon
1,018 litre
Baggage Volume: - -
Seats - Economy: - 1 seats
Seats - Business Class: - -
Seats - First Class: - -
Cabin Height: - -
Cabin Width: - -
Cabin Length: - -
Exterior Length: 9.93 metre
32.58 feet
9.8 metre
32.15 feet
Tail Height: 3.38 metre - 11.09 feet 4.08 metre - 13.39 feet
Fuselage Diameter: - 0.9 metre
2.95 feet
Wing Span / Rotor Diameter: 11.25 metre
36.91 feet
11.28 metre
37.01 feet
Wing Tips: No Winglets No Winglets
More Info: Nakajima Ki-84 North American P-51 Mustang
Data presented is for entertainment purposes and should not be used operationally.

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About the Nakajima Ki-84

Nakajima Ki-84
Editorial Team Nakajima Ki-84

First, let’s dive into the Nakajima Ki-84, also known as “Hayate,” which means “Gale” in Japanese. Developed by the Nakajima Aircraft Company, this fighter was Japan’s response to the need for a high-performance aircraft to counter the Allies’ advancements.

The Nakajima Ki-84, a shining star in the Japanese Imperial Army Air Service, was a response to the Allies’ superior aircraft during World War II. Known for its agility and speed, the Ki-84 was a force to be reckoned with in the Pacific theater.

What made the Ki-84 stand out? Its Nakajima Ha-45 engine. This beast of an engine, producing around 1,990 horsepower, was the heart of the Ki-84’s high speed and combat prowess. And get this – it could hit a top speed of about 624 km/h (387 mph).

Nakajima Ki-84 (Army Type 4 Fighter)
Editorial Team Nakajima Ki-84 (Army Type 4 Fighter)

Firepower and Maneuverability

The Ki-84’s most striking feature was its armament – two 20mm and two 30mm cannons. This made it one of the most heavily armed Japanese fighters. In terms of maneuverability, the Ki-84 was a dream for ace pilots. Its agility in dogfights was a significant advantage, allowing it to engage and disengage at will.

Challenges in Production and Maintenance

As with many things in war, it faced production challenges due to dwindling resources in Japan. Its complicated engine and the declining quality of materials due to war constraints affected its reliability. Many Ki-84s suffered maintenance issues, limiting their effectiveness as the war progressed.

Despite these hurdles, the Ki-84 was a significant leap in Japanese fighter design during the war, representing their advanced aeronautical engineering capabilities​​​​.

About the P-51 Mustang

North American P 51 Mustangs
Robert Sullivan North American P-51 Mustangs

Now, let’s talk about the P-51 Mustang, a symbol of American airpower. This beauty was originally designed to fulfill a British requirement for fighter aircraft. It was a game-changer when it came to long-range bombing escorts, thanks to its Rolls-Royce Merlin engine.

Long-Range Escort and High-Altitude Performance

The Mustang’s crowning glory was its range and performance at high altitudes, crucial for escorting bombers deep into enemy territory. This capability significantly impacted air warfare, as it provided crucial protection for Allied bombers, something the Ki-84 couldn’t match.

The Mustang was versatile too, used in various roles like reconnaissance and ground attack. It’s like the Swiss Army knife of WWII fighters!

North American P 51 Mustang INA Macon Belle
Robert Sullivan North American P-51 Mustang ‘INA Macon Belle’

Adaptability in Various Roles

Additionally, the Mustang’s versatility allowed it to perform in multiple roles, including reconnaissance and ground attack, making it an invaluable asset across different theaters of war.

How are the Ki-84 and P-51 Different?

The differences between these two are like night and day. The Ki-84 was a testament to Japan’s desperate need to compete with advanced Allied aircraft. Its engine, armament, and design were top-notch for the time, but it was plagued by production issues and the declining quality of materials.

The Mustang, on the other hand, was a symbol of American industrial might and innovation, excelling in roles that the Ki-84 couldn’t – particularly in range and high-altitude performance.

High-Altitude Combat

In high-altitude combat, the P-51 Mustang had a clear edge. The Ki-84 struggled in this aspect, limiting its effectiveness against high-flying bombers and escort fighters like the Mustang.

Ground Attack

While the Ki-84 was capable in air-to-air combat, it wasn’t as effective in ground attack roles as the Mustang, which could adapt to various combat scenarios.

Range and Endurance

The Mustang’s superior range and endurance meant it could engage in prolonged combat operations far from base, a significant advantage in strategic warfare. The Ki-84, with its limited range, was more suited to defending local airspace.

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And Their Similarities?

Despite their differences, both these fighters were at the top of their game in speed and agility. They were both designed to be the best in their respective air forces and played pivotal roles in their theaters of war.

What’s Better About the Ki-84?

The Ki-84 had the upper hand in firepower and agility. With its combination of 20mm and 30mm cannons, it packed a serious punch. It was also known for its maneuverability, which in the hands of a skilled pilot, made it a deadly adversary.

And the P-51 Mustang?

The Mustang’s long-range capability and high-altitude performance were its crown jewels. Its ability to escort bombers deep into enemy territory and back was a crucial factor in the Allies’ air superiority. Plus, its versatility across various roles made it an invaluable asset.


In conclusion, while the Nakajima Ki-84 was a formidable opponent in terms of firepower and agility, especially in close-range dogfights, the P-51 Mustang’s long-range capabilities, high-altitude performance, and versatility made it a more impactful aircraft in the broader context of WWII. The Ki-84 was a master of agility and firepower, a true samurai of the skies, while the Mustang was the versatile knight, adapting to various roles and excelling in them.

In the end, choosing between the Nakajima Ki-84 and the P-51 Mustang is like picking between sushi and barbecue – both are incredible in their own ways. The Ki-84 was a symbol of Japan’s advanced engineering under pressure, while the Mustang was a testament to American innovation and industrial strength. Both fighters left a lasting legacy in the annals of military aviation history.

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