The North American F-hundred Super Sabre and the first production fighter to go supersonic in level flight on May twenty-fifth, nineteen fifty-three

The North American F-100 Super Sabre was the first production fighter aircraft to exceed the speed of sound in level flight. On May 25, 1953, test pilot George Welch flew the YF-100A past Mach 1.1 at Edwards Air Force Base, proving that supersonic performance could belong to an operational combat aircraft — not just a research rocket with minutes of fuel.

Why Did the F-100 Matter More Than the X-1?

Chuck Yeager broke the sound barrier in the Bell X-1 on October 14, 1947. That achievement was historic, but the X-1 was a research vehicle. It carried no weapons, had no operational role, and couldn’t scramble to intercept a Soviet bomber. It was launched from beneath a B-29 and had roughly two and a half minutes of powered flight before its rocket fuel ran out.

The Cold War demanded something entirely different: a fighter that could go supersonic under its own power, take off from a runway, carry ordnance, and fly again the next day. The F-100 was that fighter.

How North American Designed a Supersonic Fighter

North American Aviation started with a clean sheet. The design incorporated several breakthroughs:

An area-ruled fuselage, pinched at the waist to reduce transonic drag — one of the first fighters to use this principle
Wings swept back at 45 degrees, far more aggressively than the F-86 Sabre that preceded it
A Pratt & Whitney J57 turbojet with afterburner, producing 16,000 pounds of thrust — the most powerful engine available to a fighter at the time

The Air Force was so confident in the design, and so pressed by the strategic situation following the Korean War, that they ordered the F-100 into production before the prototype even flew.

Who Was George Welch?

The man who flew the F-100 into history was no stranger to extraordinary circumstances. On the morning of December 7, 1941, George Welch was a 23-year-old Army Air Corps lieutenant stationed at Wheeler Field, Oahu. He had been up all night playing poker.

When Japanese bombs began falling, most pilots couldn’t reach their aircraft. Welch and fellow pilot Ken Taylor drove to a dispersal field at Haleiwa, got two P-40s airborne, and flew directly into the attack. Welch shot down four enemy aircraft that morning, possibly more. He was one of only a handful of American pilots to get airborne during Pearl Harbor.

After the war, Welch became a test pilot for North American Aviation. Persistent but unconfirmed accounts suggest he may have exceeded the speed of sound in a dive in an F-86 Sabre in late 1947 — potentially before Yeager’s X-1 flight. The Air Force had strong institutional reasons to ensure their program received the credit. Whether Welch beat Yeager remains one of aviation’s most debated questions, living in the space between hangar lore and classified history.

What Happened on May 25, 1953?

On that morning at Edwards Air Force Base, Welch took the YF-100A off the runway, climbed over the Mojave Desert, and lit the afterburner. In level flight — no dive, no launch assist — the Mach needle crept past 1.0. A sonic boom rolled across the desert floor.

Welch reportedly touched Mach 1.1 on that first flight. The age of the supersonic fighter had arrived.

Why Was the F-100 Called “The Hun”?

Production F-100s began reaching squadrons in 1954. Pilots transitioning from the F-86 found an aircraft that was faster, heavier, and far less forgiving. The Super Sabre quickly earned the nickname “The Hun” — short for “hundred,” but also because it was killing pilots.

Early models suffered from adverse yaw coupling. At high speeds and high angles of attack, the aircraft could depart controlled flight with almost no warning — rolling one direction while yawing the other. On approach, this was called the “Sabre Dance”: the nose would pitch up, the aircraft would roll, and at low altitude, recovery was often impossible.

North American addressed the problem by lengthening the vertical tail, adding a yaw damper, and refining the wing. The F-100D, which became the definitive variant, was a genuinely capable aircraft. Never easy to fly, but manageable for pilots who respected it. It could cruise at Mach 0.9 and dash beyond Mach 1.3.

How Did the F-100 Perform in Vietnam?

The F-100D flew more combat missions in Southeast Asia than any other fighter. Its roles included:

Low-level close air support with napalm and 20mm cannon
MiGCAP (combat air patrol) missions over North Vietnam
Wild Weasel defense suppression, hunting surface-to-air missile sites

The USAF Thunderbirds also flew the Hun for five years, somehow making one of the most demanding fighters in the inventory look graceful.

The Death of George Welch

On October 12, 1954 — just seventeen months after that first supersonic flight — Welch was testing an F-100A at Edwards. During a high-speed dive pulling 7.5 Gs, the aircraft suffered a catastrophic structural failure. George Welch was killed at the age of 36.

He had been nominated for the Medal of Honor for his actions at Pearl Harbor, but the paperwork was downgraded because he had taken off without direct orders. Bombs were falling and hangars burning, and someone behind a desk decided that fighting back on his own initiative was not enough.

What Was the F-100’s Legacy?

The F-100 Super Sabre served with the Air Force until 1971 and with the Air National Guard into the late 1970s. Over 2,300 were built.

It was the first of the Century Series fighters — that remarkable sequence of Cold War machines: the F-100, F-101, F-102, F-104, F-105, and F-106, each faster and more capable than the last. The Super Sabre opened that door.

After May 25, 1953, supersonic flight was no longer an experiment. It was routine.

A handful of F-100s survive in museums today, including a restored D model at the National Museum of the United States Air Force in Dayton, Ohio.

Key Takeaways

The F-100 Super Sabre was the first production fighter to exceed Mach 1 in level flight, achieving Mach 1.1 on May 25, 1953, at Edwards Air Force Base.
George Welch, a Pearl Harbor combat veteran and North American test pilot, flew that historic mission — and was killed in an F-100 structural failure just 17 months later.
Early F-100 models were dangerously unstable, suffering from adverse yaw coupling that killed multiple pilots before design corrections produced the reliable F-100D.
The F-100D flew more combat missions in Vietnam than any other fighter, serving in close air support, MiGCAP, and Wild Weasel roles.
As the first Century Series fighter, the F-100 launched an era of increasingly capable supersonic combat aircraft that defined Cold War air power.