The Gee Bee R-1 Super Sportster, the Granville Brothers of Springfield, and the Thompson Trophy Season That Made the Most Dangerous Racing Airplane in America Famous

The Gee Bee R-1 Super Sportster was the fastest closed-course racing airplane in the world when Jimmy Doolittle flew it to victory at the 1932 Thompson Trophy in Cleveland, averaging 252 miles per hour. Built by the self-taught Granville Brothers of Springfield, Massachusetts, the R-1 traded every margin of stability and safety for raw speed - and it showed, both in what it achieved and in what it cost.

The Granville Brothers: Self-Taught Engineers From Springfield

In a leaky wooden hangar at the edge of a grass airfield in Springfield, Massachusetts, five brothers were building the most extreme racing airplanes of their era. Their names were Zantford (known as “Granny”), Tom, Mark, Robert, and Edward Granville. Together they ran Granville Brothers Aircraft and called their planes Gee Bees.

Not one of them held a formal aeronautical engineering degree. What they had was deep mechanical instinct - an understanding of engines and structures built through years of hands-on work. When aviation took hold of Springfield in the late 1920s, the Granvilles threw themselves into it completely.

By 1931 they had a respectable racing operation. Their Model Z, flown by Lowell Bayles, won the Thompson Trophy - the premier closed-course air race in the country - at over 200 miles per hour. It was exactly the prize they had been chasing.

Months later, Bayles took the Model Z up for a speed record attempt. A fuel cap worked loose, blew back, and struck the windshield. Bayles was killed. Most outfits would have gone home. The Granvilles went back to the drawing board.

What Made the Gee Bee R-1 So Dangerous to Fly

For the 1932 season, the Granvilles designed two new aircraft. The R-2 was built for longer races at moderate power. The R-1 was something different entirely.

They mounted a supercharged Pratt & Whitney Wasp radial engine - producing approximately 730 horsepower - on the nose of the smallest airframe they could physically construct around it. The fuselage was essentially a round tube. The wings were short and stubby. The cockpit was shoved so far aft it nearly sat on the tail. The control surfaces were minimal by design, not by accident.

Every decision was a deliberate trade: drag for speed, stability for performance, safety margin for horsepower. The designers understood exactly what they were giving up. In the racing world of the 1930s, the logic was blunt - the airplane that gets there first wins. Everything else is excuses.

The result was an aircraft with almost no inherent stability and almost no forgiveness. An unintended control input at 200-plus miles per hour didn’t register as a violent reaction - it registered as a suggestion. But a suggestion at that speed offers no time to recover. The Gee Bee demanded total concentration from the moment of takeoff to the moment of landing, with nothing held in reserve.

Jimmy Doolittle: The Right Pilot for the R-1

The Granvilles needed a specific kind of pilot. They found one.

Jimmy Doolittle was 35 years old in the summer of 1932 and had already accumulated more aviation accomplishments than most pilots collect in a career. He held a doctorate in aeronautical engineering from MIT - among the first ever awarded. He had set transcontinental speed records and flown military aircraft across multiple disciplines.

Most significantly, on September 24, 1929, at Mitchel Field on Long Island, Doolittle had done something no human being had done before. He took off in a Consolidated NY-2 biplane, flew a complete circuit, and landed - entirely by instruments, with a hood over the cockpit so he could not see outside. No glance at the horizon. No visual reference of any kind. Purely by needles. It was the first fully blind flight in history.

That combination of technical knowledge and extreme precision made Doolittle the right person for an airplane that punished every lapse.

The 1932 Thompson Trophy Race at Cleveland

September 3, 1932. Cleveland Municipal Airport. The National Air Races had drawn crowds estimated at 100,000 people - Depression-era crowds who had scraped together a few cents to watch something extraordinary.

The Thompson Trophy ran a closed course: orange-and-white wooden pylons arranged in a rough oval around the airport grounds, each roughly ten miles from the next. The pilots flew flat out at low altitude, banking hard around each turn, for multiple laps. No altitude buffer. No margin for distraction.

Doolittle flew the R-1 the way it demanded to be flown - fully engaged, every lap, every second. The airplane handled exactly as the Granvilles had designed it: with no automatic stability, no forgiveness, and no allowance for inattention. He flew lap after lap around the Cleveland pylons, keeping the R-1 flat and fast.

He won.

252 MPH: What That Number Actually Meant

Doolittle’s average speed for the course was 252 miles per hour.

For context: the fastest pursuit aircraft the U.S. Army Air Corps had operational in that era were capable of approximately 200 miles per hour in clean, straight-and-level flight. Doolittle was flying 50 miles per hour faster than a military fighter - while pulling banked turns at low altitude on a closed course.

After landing, he stood in the cockpit, pumped his fist once, and taxied in.

Doolittle Retires - and Why That Decision Mattered

Shortly after the victory, Doolittle announced he was done with air racing. His reasoning was straightforward: a man’s luck is not infinite. He had accomplished everything there was to accomplish in the discipline. He had a family at home. And the Gee Bee had shown him, clearly enough, what the edge of the envelope looked like.

He walked away and never raced again.

The pilots who flew the R-1 after him were not as fortunate. Russell Boardman, a capable and experienced racing pilot, took the R-1 up at Indianapolis later that same season and went in hard at speed. He survived, but barely, with serious injuries. The airplane was destroyed.

The Gee Bee’s Deadly Record After 1932

The Granvilles rebuilt and kept designing. Other pilots kept climbing into other Gee Bees. The arithmetic of the racing era continued as it always did.

By the mid-1930s, most of the race-configured Gee Bees had ended their careers in the ground. The last serious race-configured Gee Bee killed its pilot in 1935.

Granny Granville himself died in a crash in 1934. He was 33 years old - not in a Gee Bee, but in a light aircraft on a routine passenger trip. Fuel contamination was the cause. Aviation in that era didn’t reserve its risks for the fastest machines. The company scattered, and the remaining brothers moved on to other work.

Were the Granvilles Reckless?

It’s a fair question, and the honest answer is: not exactly.

The Granvilles thought carefully about every rivet. They worked within the bounds of aeronautical knowledge as it existed in the early 1930s. They hired the best pilots available and tested what they could test. The problem wasn’t carelessness - it was a fundamental gap between what their engines could produce and what control theory and airframe engineering of the era could reliably manage.

Aviation in the 1920s and 1930s was a race between what hardware could do and what engineers understood about making it safe. The hardware was winning by a comfortable margin. The Gee Bee R-1 was the most uncompromising expression of that fact: no pretense of a safety margin, no comfortable buffer between the pilot and the edge of the envelope. It was exactly what the technology could do, with nothing held back.

That is a dangerous thing to build. It is also, in its own particular way, a remarkable one.

Where to See a Gee Bee Today

A full-scale Gee Bee replica is on permanent display at the New England Air Museum in Windsor Locks, Connecticut. It produces the same reaction in nearly every pilot who stands in front of it: something caught between awe and unease - the simultaneous recognition of what was possible and what it cost.

Primary sources on the Granville Brothers and the 1932 Thompson Trophy season include race records held at the National Air and Space Museum in Washington, D.C., and contemporary Cleveland newspaper coverage from the September 1932 race.

Key Takeaways

The Gee Bee R-1 Super Sportster was built by the self-taught Granville Brothers of Springfield, Massachusetts, deliberately designed to trade stability and safety margins for maximum speed.
Powered by a supercharged Pratt & Whitney Wasp radial producing approximately 730 horsepower, the R-1 represented the absolute performance limit of 1930s airframe technology.
Jimmy Doolittle won the 1932 Thompson Trophy in the R-1 at an average of 252 mph - roughly 50 mph faster than contemporary military fighters in level flight.
Doolittle retired from air racing immediately after the win, citing finite luck and family; the pilots who flew the R-1 after him suffered serious injury or death.
The Gee Bee’s legacy reflects the defining tension of the Golden Age: engine technology had outpaced aerodynamic understanding, and the R-1 was the most honest expression of that gap.