The Granville Brothers, the Gee Bee Super Sportster, and the Most Dangerous Race Aircraft of the Golden Age

The Gee Bee R-1 Super Sportster was the most extreme aircraft of its era: a machine that averaged 252.68 miles per hour over a closed pylon course at Cleveland Municipal Airport in September 1932, built by five brothers in a corrugated metal hangar in Springfield, Massachusetts. Its design philosophy stripped everything from the airframe except speed - and it demanded a pilot capable of matching that precision without a single lapse. Only one man was widely considered to have fully met that standard. He won the race, climbed out of the cockpit, and never flew a Gee Bee again.

What Was the Thompson Trophy?

The National Air Races were held every Labor Day weekend at Cleveland Municipal Airport through the 1930s, drawing crowds of roughly 100,000 people from across Ohio and the Midwest. The signature event was the Thompson Trophy, funded by Cleveland industrialist Charles E. Thompson, who built his fortune in auto parts.

The format was unsparing: ten laps of a closed pylon course, each lap five miles - fifty miles total. Concrete pylons were staked at ground level. Competitors flew around them in steep banks at low altitude with the throttle pinned to the firewall for the entire race. No cruise setting. No backing off. Full power, start to finish.

That specification removed every constraint practical aviation normally imposes. Thompson Trophy aircraft didn’t need to carry passengers, log thousands of hours of service, or tolerate an inattentive pilot. They needed to be fast for fifty miles, once a year. Everything else was negotiable.

Who Were the Granville Brothers?

Zantford, Thomas, Mark, Edward, and Robert Granville established the Granville Brothers Aircraft Company - Gee Bee, for short - at the Bowles Agawam Airport in Springfield, Massachusetts. Zantford, who went by Granny, had been building aircraft since the late 1920s. The early models were conventional biplanes: useful, well-made, not remarkable.

But each aircraft refined his understanding of where drag lived and how to eliminate it. By the time the Granvilles reached their Model Z, that philosophy had hardened: everything that doesn’t generate speed is a liability. The cowling sized exactly to the engine. The fuselage tapered as aggressively as physics allowed. Wing area calculated for the lift required at race speed, nothing more. Every extra pound a penalty. Every surface not earning its keep, slowing you down.

Applied strictly, this produces an aircraft that looks wrong. Conventional design carries deliberate redundancy - extra tail surface for stability, a fuselage long enough to keep the pilot well forward of the center of gravity, wing area providing a comfortable margin above stall speed. These features exist because pilots make small mistakes, and properly designed aircraft keep small mistakes small. The Gee Bee carried none of that forgiveness.

The Model Z Wins Cleveland in 1931

The Model Z debuted at the 1931 National Air Races powered by a Pratt & Whitney Wasp producing over 400 horsepower. The fuselage shape - enormous up front, collapsing to almost nothing at the tail - prompted one reporter to call it a tadpole and another to call it the world’s most aerodynamic pickle. Lowell Bayles flew it to an average speed of 236 miles per hour and won the Thompson Trophy.

The aviation press spent the following months processing what had happened in Cleveland. The Model Z was not a refinement of existing ideas. It was a different category of machine.

The R-1: The Most Extreme Version of the Idea

The Granvilles spent the winter of 1931–1932 in that Springfield hangar building the Model R - two aircraft with slight specification differences: the R-1 and the R-2. Everyone called them the Gee Bee. The R-1 was the faster of the two.

The R-1 ran a Pratt & Whitney Wasp Senior producing between 550 and 800 horsepower, depending on what the Granvilles had done to it most recently - they were always modifying it. That engine sat in a cowling fitted with almost no clearance. The entire aircraft measured 21 feet from spinner to rudder. The wingspan was 25 feet. Empty weight was approximately 2,000 pounds.

The cockpit was pushed so far aft that pilots described it as sitting on top of the tail. Looking forward meant looking at the back of an enormous radial engine and the top of the cowling. Useful outside visibility was almost entirely to the sides. Controls were direct and instantaneous - the aircraft responded immediately to inputs, with no lag, no softening, no forgiveness built into the linkages. This was not an unpleasant characteristic. It was a demanding one.

When it sat on the ramp at Cleveland in 1932, painted red and white, it was genuinely beautiful in the way purpose-built machines sometimes are: not graceful, but completely coherent. Every surface explained by its function. Nothing wasted.

Jimmy Doolittle and the 1932 Thompson Trophy

In 1932, James H. “Jimmy” Doolittle was already among the most technically accomplished aviators alive. He held a doctorate in aeronautical engineering from MIT. He had set multiple world speed records. He had flown the outside of an outside loop - negative-G aerobatics most experts considered physiologically impossible. And in September 1929 at Mitchell Field on Long Island, he had taken off, flown a prescribed course, and landed a completely hooded aircraft with no external visibility, guided entirely by cockpit instruments. That was the first successful blind instrument flight in aviation history.

Doolittle did not simply climb into the R-1 and race it. He test-flew the aircraft methodically before race day, identified its tendencies - the immediate control response, the narrow error margin imposed by its center of gravity placement - and worked out the correct inputs in advance. He was engineering his own reactions before the race began.

On September 3, 1932, under clear skies, Doolittle lined up against a competitive field that included the Wedell-Williams racers from Louisiana, flown by excellent pilots. Jimmy Wedell himself was on the start line. The outcome was not predetermined.

Doolittle flew ten laps at full power - fifty miles - and averaged 252.68 miles per hour, crossing the finish line with a new Thompson Trophy record. The crowd went out of their minds.

Why Doolittle Walked Away

After accepting the trophy, Doolittle told anyone who asked that he was finished with air racing.

His reasoning was technical, not dramatic. He said the R-1 required a level of sustained attention that could not be maintained indefinitely. The acceptable window for a control correction was narrow enough that any lapse in concentration could end very badly. He had flown the aircraft at its limits for fifty miles, and he understood precisely how thin those limits were. He had the skill to do it. He saw no reason to go back.

From a man who would go on to lead the April 1942 raid on Tokyo - 16 B-25 Mitchells launched from the carrier USS Hornet - and later command the Eighth Air Force, that statement carries weight. Doolittle did not lack nerve. He had evaluated the aircraft as an engineer and concluded that the margin was real, that he had found it, and that returning to find it again served no purpose he could justify.

The Gee Bee’s Record in Other Hands

The accident history confirms everything in that assessment. Lowell Bayles, who won the 1931 Thompson Trophy in the Model Z, was killed in December 1931 when the aircraft shed a fuel access cover at low altitude, snapped inverted, and broke apart before any corrective action was possible. Cecil Allen flew the R-2 in subsequent racing and was killed when the aircraft departed controlled flight during a race. Russell Boardman, a highly experienced pilot, was severely injured in a crash involving a rebuilt R-1.

The pattern is consistent. The Gee Bee rewarded pilots who stayed precisely ahead of it. It had no mechanism for forgiving pilots who fell behind it by even a fraction of a second.

Was the Gee Bee Brilliantly or Poorly Designed?

Historians have debated this for nearly a century. The most accurate answer is that it was brilliantly designed for a specification only a handful of pilots in the world could satisfy. The center of gravity placement, the tail moment arm, the power-to-weight ratio - these were deliberate choices made in pursuit of a specific performance target. In Doolittle’s hands, they produced 252 miles per hour over a pylon course in 1932.

The aircraft did not adjust those physics based on who climbed in.

What the Gee Bee Represented - and What Replaced It

As the 1930s progressed, aviation moved away from the design philosophy the Granvilles had pushed to its logical extreme. Not because engineers lost their ambition, but because the industry had grown. Airlines needed aircraft manageable through a ten-hour day by line pilots. The military needed aircraft that could be flown by tens of thousands of men trained in months rather than years. Stability became a design feature. Docility became a virtue.

That shift was necessary and right. It also ended something. The era of aircraft designed specifically for the two best pilots in the world - built on the premise that the gap between a great machine and a great pilot was the only variable worth optimizing - gave way to aircraft designed for everyone who could earn a license.

The original R-1 is gone. The R-2 was eventually destroyed. Replicas built from the original engineering drawings have been constructed and flown at airshows, including a flying reproduction built in California. If one appears at an event you attend, put yourself at the fence and watch it come around a pylon.

Key Takeaways

The Gee Bee R-1 Super Sportster was built by the five Granville brothers in Springfield, Massachusetts, for the specific purpose of winning the Thompson Trophy at the National Air Races in Cleveland.
Its design stripped everything from the airframe except speed - 21 feet long, 25-foot wingspan, approximately 2,000 pounds empty - leaving no stability margin and no pilot forgiveness.
Jimmy Doolittle flew the R-1 to a Thompson Trophy record of 252.68 mph on September 3, 1932, then retired from air racing, citing the aircraft’s unforgiving demands as a reason not to attempt it a second time.
Subsequent fatal and serious accidents involving Lowell Bayles, Cecil Allen, and Russell Boardman confirmed the R-1 and R-2’s extreme intolerance for any imprecision.
The Gee Bee marked the endpoint of a design philosophy that treated the gap between the best machine and the best pilot as the only engineering variable that mattered - a philosophy the growing aviation industry had no further use for.