The Gee Bee Racer: The Granville Brothers and the Most Dangerous Airplane of the Nineteen Thirties

The Gee Bee Super Sportster was the fastest closed-course racing airplane of its era and, by most accounts, one of the most unforgiving machines ever built. Five brothers from Springfield, Massachusetts conceived it, Jimmy Doolittle flew it to a world race record, and the story of its brief, violent career tells you nearly everything worth knowing about how aviation knowledge gets made at the frontier.

Who Were the Granville Brothers?

Zantford, Edward, Mark, Thomas, and Robert Granville established the Granville Brothers Aircraft Company at Springfield Airport in Massachusetts around 1929. Zantford - universally called “Granny,” a contraction of the family name - was the driving force. Early Granville designs were conventional biplanes that performed well in regional competition. But Granny had been watching the Thompson Trophy races in Cleveland, and watching was no longer enough.

The Thompson Trophy, donated by Cleveland industrialist Charles E. Thompson, was a closed-course pylon race held every Labor Day weekend at Cleveland Municipal Airport. Pilots flew multiple laps around a course marked by tall pylons, running engines at full throttle, pulling steep banks, and passing the gallery at treetop level. Crowds of 100,000 to 150,000 people attended in those years. The event was covered in newspapers and movie newsreels. For millions of Americans, this was what aviation looked like.

Granny’s design philosophy was simple and uncompromising: marry the largest available engine to the smallest possible airframe. Drag was the enemy. Weight was the enemy. Anything not directly producing speed came off.

The Model Z: Speed and a Warning

The brothers’ 1931 entry was the Model Z, and it was both a revelation and an omen. Powered by a Pratt & Whitney Wasp Junior producing 420 horsepower, the airplane featured an enormous round cowling dominating its profile. Behind it, the fuselage was barrel-shaped and strikingly short. The cockpit sat so far aft the pilot was essentially at the base of the vertical stabilizer.

This abbreviated fuselage was intentional. Less fuselage meant less wetted area, and less wetted area meant less drag. The consequence was a very short moment arm between the wing’s center of lift and the horizontal tail, which left the tail surfaces with minimal leverage to correct deviations. The Model Z was twitchy and demanding - not the measured attention a stable airplane requires, but the sustained, disciplined focus you give something that is actively looking for an opportunity to depart controlled flight.

Lowell Bayles, 30 years old and known for smooth, economic stick work, flew the Model Z at Cleveland in 1931 and won the Thompson Trophy at an average speed of 236 mph. In an open-cockpit racing airplane. In 1931. The aviation world took notice.

The Death of Lowell Bayles

Three months after his Thompson Trophy win, Bayles took the Model Z to Wayne County Airport near Detroit for an attempt on the world landplane speed record. On one of the high-speed runs, the fuel cap on the upper cowling broke loose under aerodynamic pressure. It came back into the cockpit and struck Bayles. The airplane went out of control immediately and hit the ground at speed.

Lowell Bayles died in the wreckage. He was 30 years old.

The accident investigation determined the proximate cause was mechanical failure of the fuel cap - not pilot error, not poor airmanship. A small piece of hardware failed at the worst possible moment. Granny Granville absorbed the loss and went back to work.

The R-1 Super Sportster: Eight Hundred Horsepower

For 1932, the brothers built the R-1 Super Sportster, and if the Model Z had been demanding, the R-1 operated on a different level entirely.

The R-1 was powered by a Pratt & Whitney Wasp Senior producing 800 horsepower - in an airplane weighing approximately 2,000 pounds fully fueled. The fuselage was even shorter and more barrel-like than the Model Z. The cockpit sat so far aft that the pilot’s eyes were roughly level with the trailing edge of the wing. Looking forward, you saw cowling. The horizon over the nose only appeared when you pushed the nose down.

The center of gravity envelope was narrow. Small variations in fuel load or weight distribution could push the airplane toward the edge of its controllable range. The ailerons demanded constant management. The rudder required the same. It was not a machine that accepted inattention.

Why Jimmy Doolittle Was the Right Pilot

The Granvilles needed a pilot who could do two things simultaneously: understand precisely what the R-1 was doing at every moment, and remain ahead of it when it tested him. That was a short list of people in 1932. They went to Jimmy Doolittle.

Doolittle held a doctorate in aeronautics from the Massachusetts Institute of Technology and had conducted the landmark blind-flying research in 1929 that proved instrument flight was viable. But his value in the R-1 wasn’t just airmanship - it was engineering rigor applied in the cockpit. When Doolittle sat in an unfamiliar airplane, he built a precise mental model of why it was behaving as it did, mapping its tendencies and edges with systematic thoroughness.

Before he ever touched the R-1’s controls, Doolittle talked at length with the Granville brothers. He wanted to understand the airplane’s known characteristics, the corners of its envelope, how the center of gravity margins would tighten as fuel burned off, and what it would do if he got slow on the back side of a pylon turn. He then flew it incrementally, building speed deliberately, learning its feel. He took nothing for granted.

The 1932 Thompson Trophy: A Record That Stood

September 3, 1932. Cleveland Municipal Airport. Ten laps around the pylons, approximately 15 miles per lap - 150 miles at full throttle. The September sky over Cleveland was clear. The gallery was packed.

Doolittle flew the R-1 the way a surgeon uses a scalpel. Clean on the pylons, carrying energy through the turns, managing engine temperatures, staying ahead of the airplane’s tendency to wander. He did not fly it to the airplane’s limit. He flew it to his own limit, which was more than sufficient.

He won the Thompson Trophy at an average speed of 252.5 mph - a new race record.

He climbed out of the cockpit, accepted the trophy, and told the press he was retiring from air racing. He was 36 years old. He had recognized, with the clarity that defined everything he did, that the sport had reached a point where danger was no longer primarily a function of pilot skill. The machines were operating so close to their structural and aerodynamic limits that even the finest pilot was partly at the mercy of a fuel cap, a connecting rod, a stress fracture in a spar. He stepped back from the edge before the edge could come for him.

What Happened to the R-1 After Doolittle

Under financial pressure, the Granvilles sold the R-1. In 1933, pilot Russell Boardman campaigned it in the Bendix Trophy race - a transcontinental dash from Los Angeles to Cleveland. The R-1 delivered its opinion of the arrangement somewhere over the Midwest. Boardman crashed on approach to Cleveland. He survived with serious injuries. The airplane was badly damaged.

The Granville Brothers Aircraft Company did not survive the decade. The Depression made sponsorship difficult, and the accidents - fairly or not attributable to the design - had made the Gee Bee name complicated in the eyes of potential backers. Then in the spring of 1934, Granny Granville was killed in a crash. Not in a racer - a routine local flight in a lighter aircraft. He was 33 years old. The company dissolved. The machines that had dominated the racing circuit for four seasons were wrecked, stored, and gradually reduced to footnotes.

What the Gee Bee Actually Represents

The Gee Bee gets discussed as an example of reckless design - a machine built to win at any cost, including pilots’ lives. There is truth in that. The stability margins were unacceptably thin by any standard, and the handling characteristics demanded sustained concentration that very few pilots possessed.

But the Granville brothers were not careless men. They were working at the absolute frontier of what anyone understood about high-speed aircraft design in the early 1930s. No computational fluid dynamics. No digital simulation. No accumulated database of high-powered racer accidents to analyze. Their wind tunnel was the sky above Cleveland, and they were generating knowledge that didn’t yet exist anywhere else.

Every failure, every accident report, every crash from those years of Golden Age racing contributed to a body of understanding about stability margins, control response, and structural limits. The engineers who designed the fighters and bombers of the Second World War knew things about high-powered aircraft behavior they would not have known without the Granvilles - and without Bayles, Doolittle, and everyone else who pushed the boundaries until the boundaries pushed back. That is not a justification for the lives lost. It is simply the truth of how aviation knowledge gets made when you are inventing the field as you go.

A flying replica of the R-1 is on display at the New England Air Museum in Windsor Locks, Connecticut. A static display can be found at the National Air and Space Museum in Washington, D.C. Stand next to one. Notice how short the fuselage is. Notice where the cockpit sits relative to the wing. Notice how much airplane sits in front of the pilot and how little sits behind.

Key Takeaways

The Granville Brothers built the Gee Bee Model Z and R-1 Super Sportster in Springfield, Massachusetts between 1931 and 1932, driven by Zantford “Granny” Granville’s singular focus on winning the Thompson Trophy.
The R-1’s extreme design - 800 hp in a ~2,000 lb airframe with a deliberately shortened fuselage - produced record-breaking speed at the cost of razor-thin stability and control margins.
Jimmy Doolittle won the 1932 Thompson Trophy at 252.5 mph, then immediately retired from air racing, recognizing that the sport had outpaced what pilot skill alone could control.
Lowell Bayles was killed in 1931 when a fuel cap failed during a speed record attempt - mechanical failure, not pilot error, in a machine with no margin for either.
The Gee Bee program’s legacy is mixed but real: the hard-won aerodynamic knowledge from Golden Age racing directly informed the aircraft designers who built World War II’s combat aircraft.