The Planes of Fame Zero and the last original Mitsubishi A six M flying on its own Sakae engine

Of the more than 10,500 Mitsubishi A6M Zeros built during World War II, exactly one remains airworthy with its original Nakajima Sakae engine. It lives at the Planes of Fame Air Museum in Chino, California, and it is the only aircraft on Earth that can demonstrate what designer Jiro Horikoshi actually created — not an approximation with an American engine swap, but the real thing.

Why Was the Zero So Revolutionary?

When the Mitsubishi A6M appeared over China in 1940, Western intelligence refused to believe Japan had produced a fighter this capable. It could outclimb, outturn, and outrange everything in the Pacific theater. The secret was ruthless weight reduction by chief designer Jiro Horikoshi: no armor plating, no self-sealing fuel tanks. The pilot’s only protection was his skill.

The Zero weighed barely 5,300 pounds loaded and was powered by the Nakajima Sakae twelve (later the Sakae twenty-one), a fourteen-cylinder twin-row radial producing roughly 1,000 horsepower. Its fuel efficiency gave the Zero a loiter time of six to eight hours — endurance no American fighter in 1941 could match.

How Did This Particular Zero Survive?

This airplane is a Model 52 (A6M5), serial number 1493, manufactured in 1943 at the Mitsubishi factory in Nagoya. It was captured on Saipan in the summer of 1944 when American forces overran Japanese positions so quickly that intact fighters were left on the airfield with fuel still in the tanks.

The aircraft was shipped stateside for technical intelligence evaluation. Every rivet, control cable, and cockpit gauge was documented. After testing, it became surplus — just another piece of captured equipment. For years it sat in storage, then outdoors. Corrosion set in.

Who Saved It?

Ed Maloney rescued the airframe in the late 1950s. Before a warbird movement existed, before anyone thought old military aircraft were worth preserving, Maloney was pulling them from scrapyards and bombing ranges. He founded what became the Planes of Fame museum in 1957.

Maloney recognized immediately what he had: not a reconstruction, not a composite cobbled from multiple wrecks, but a single original Mitsubishi A6M with its original Nakajima Sakae engine. That distinction is critical.

Why Not Just Install an American Engine?

Nearly every other flying Zero at airshows runs a Pratt & Whitney R-1340 Wasp in the nose. The practical reasons are obvious: Sakae engines have no parts pipeline. No overhaul shop on the planet stocks Sakae crankshaft bearings. Every component must be measured, inspected, and either reused or custom-fabricated.

Maloney and his team refused the easy road. They wanted the Zero to fly as Horikoshi intended — with the engine the airframe was designed around. That decision turned a restoration into a decades-long commitment.

What Made the Restoration So Difficult?

The airframe was completely disassembled. Every skin panel was removed and the internal structure inspected inch by inch. Where corrosion had penetrated, new aluminum was hand-formed to match original Japanese specifications — not American standards. The alloys were different. The gauge thicknesses were metric. The rivet patterns followed Japanese engineering conventions.

The cockpit was restored to original configuration. Designed for a pilot averaging about 5 feet 3 inches tall and 130 pounds, it is strikingly compact. The instrument panel is sparse by Western standards: compass, altimeter, airspeed indicator, engine gauges, and a gunsight directly in the pilot’s line of vision.

The Sakae engine posed the greatest challenge. After decades of dormancy, salt air exposure, and neglect, reviving the fourteen-cylinder supercharged radial required something closer to archaeological restoration than conventional engine overhaul.

What Is It Like to Fly?

Steve Hinton, legendary air racer and warbird pilot who grew up around the Planes of Fame museum, flew the Zero after restoration. His descriptions reveal exactly why American tactics evolved the way they did.

The controls are light — almost too light by American standards. The ailerons respond crisply at low speed but stiffen dramatically above 200 knots. At low speed and in the dogfight envelope, the Zero is extraordinary. Its wing loading is so low it floats through turns that would stall a Corsair or Hellcat.

Above 300 knots, the picture reverses. Ailerons grow heavy, controls compress. This is precisely why American pilots learned never to turn with a Zero — the Thach Weave, boom-and-zoom tactics, and every Navy technique developed in 1942 was a direct response to these handling characteristics.

What Does the Sakae Engine Sound Like?

The Sakae has a different harmonic than American radials. Higher-pitched, with a wailing quality. At cruise power, it almost sings. At idle, it whispers — nearly a hiss. Because the Zero has virtually no soundproofing (weight savings trumped everything), the cockpit experience is visceral: engine noise, wind noise, and vibration transmitted directly through the airframe.

How Often Does It Fly?

The museum flies the Zero only a handful of times per year, typically at their annual airshow in May. Every flight is a calculated risk against finite engine life. If the Sakae throws a rod, cracks a cylinder, or loses its supercharger, there is no replacement part to order.

The team has sourced spare Sakae engines over the years from collections, warehouses, and Pacific island jungles. A complete spare engine is extraordinarily valuable. Individual components — pistons, valves, bearings — are treated like irreplaceable artifacts. The machine shop work required to maintain operations borders on art.

Why Does Original Equipment Matter?

When the Planes of Fame Zero runs up on the Chino ramp, you are hearing exactly what a Marine on Guadalcanal heard in 1942. Not an approximation. Not a tribute. The same engine, same airframe, same sound that meant a fighter was diving out of the sun.

Of the roughly dozen Zeros surviving worldwide in any recognizable form — including static displays, partial wrecks, and engine-swapped examples — only the Chino aircraft demonstrates what Horikoshi designed, what Nakajima built, and what Japanese naval aviators flew into battle.

These machines are primary source documents. Specifications in a book cannot replicate what the running Sakae and that impossibly light airframe reveal about World War II engineering philosophy.

Key Takeaways

The Planes of Fame A6M5 Zero (serial 1493) in Chino, California is the world’s only airworthy Zero flying on its original Nakajima Sakae engine
Captured on Saipan in 1944, it was saved from deterioration by museum founder Ed Maloney in the late 1950s
The restoration matched original Japanese specifications — metric gauges, Japanese alloys, and correct rivet patterns rather than American approximations
Every flight is irreplaceable — no parts pipeline exists for the Sakae engine, making each run-up a calculated risk against finite component life
The aircraft flies a few times annually at the Planes of Fame museum, typically during their May airshow