The Granville Brothers, the Gee Bee Model R, and the Thompson Trophy That Proved the Most Dangerous Airplane of the Golden Age Could Be Flown

On September 4, 1932, Jimmy Doolittle flew the Gee Bee Model R Super Sportster to victory at the Cleveland National Air Races Thompson Trophy, averaging 252.6 miles per hour over ten laps and lapping most of the field at least once. He then climbed out of the cockpit, announced his retirement from competition flying, and never raced again. It remains one of the most consequential decisions in aviation history - made by the only pilot skilled enough to walk away from the most dangerous aircraft of the Golden Age.

What Made the Cleveland Air Races Unlike Anything Before or Since

The Cleveland National Air Races in the 1930s produced a category of aircraft that has no modern equivalent. The Thompson Trophy - established in 1930 - was a closed-course pylon race: ten laps around a roughly five-mile oval, fifty miles total, with no restrictions on aircraft design or construction. The trophy went to whoever averaged the highest speed. The only rules were do not cut a pylon, and survive.

Purpose-built racers flew these courses at two hundred miles an hour and above, at fifty feet of altitude, banking around pylons in front of crowds of fifty thousand to a hundred thousand people. The pilots understood the margins. So did the crowds. They came anyway.

Who Were the Granville Brothers?

In 1925, Zantford Granville - known universally as Granny - pooled money with his brothers Tom, Bob, Mark, and Edward and opened an aircraft repair shop at Springfield Airport in Springfield, Massachusetts. Springfield was a manufacturing city. Smith and Wesson made revolvers there. Indian Motorcycle operated on the Connecticut River. The men who grew up there understood machinery at an almost inherited level.

The Granville Brothers started with repair work and simple biplanes. Then Granny attended the Cleveland races, stood in the crowd, and came back to Massachusetts with a design philosophy that was both simple and extreme: take the most powerful engine available, build the smallest airframe that fits around it, put the pilot in whatever space remains, and fly as fast as physics allows.

The Model Z and the 1931 Thompson Trophy

The first aircraft to fully express this philosophy was the Model Z, completed in 1931. The fuselage was a short, fat barrel. A Pratt and Whitney Wasp Junior producing over 500 horsepower dominated the nose, with a cowling so large the wings appeared almost decorative. The cockpit sat far aft, the pilot peering over the enormous cowling with almost no forward view. The tail surfaces were undersized. The fuselage was so short the aircraft had essentially no natural stability in pitch.

Every aeronautics instructor of the era who saw the design drawings reached the same conclusion: this will not fly safely.

Lowell Bayles flew it to victory in the 1931 Thompson Trophy at an average speed of 236 miles per hour - nearly 40 miles an hour faster than any other aircraft on the course that day. Bayles was 26 years old.

Three months later, he was flying the same aircraft at full throttle over a measured course attempting a world land speed record. At approximately 300 miles per hour, something failed. The aircraft came apart. Bayles did not survive.

The Gee Bee Model R: Numbers That Shouldn’t Add Up

Back in Springfield, the Granville Brothers were already designing what came next.

The Model R Super Sportster was built in two versions. The R-1 wore yellow and black. The R-2 was red and white. Both were powered by the Pratt and Whitney Wasp Senior, rated at 800 horsepower - the cutting edge of American piston aircraft power in 1932.

The dimensions tell the story:

Wingspan: 25 feet
Fuselage length: 17 feet, 9 inches
Gross weight: approximately 3,000 pounds, of which roughly a quarter was engine - before adding fuel, oil, or pilot

Looking at a Gee Bee from the front meant looking mostly at engine. The wings appeared to be attached to the sides of the cowling as a secondary consideration. Every pilot who saw it for the first time reached the same conclusion: that thing cannot fly.

Why Doolittle Was the Right Pilot

By September 1932, Jimmy Doolittle was the most technically accomplished pilot in America. He had won the Schneider Trophy - the international seaplane race and speed benchmark of the 1920s - in 1925. In 1929, he completed the first successful blind flight in aviation history: departing Mitchell Field on Long Island in a hooded cockpit, flying a prescribed course entirely on instruments, and landing without once looking outside. He held a doctorate in aeronautical engineering from MIT.

He understood, at a level most pilots of his era simply did not possess, exactly what an airframe was doing in flight and why.

Granny Granville brought the R-1 to Doolittle. He spent time at Springfield before the race learning the aircraft. What he found matched the design numbers exactly. The R-1 required constant, active management at all speeds. At full throttle it lived at the edge of stability, demanding precise inputs with no margin for distraction and no forgiveness for a control input that ran ahead of thought. The tail wanted to swing. The nose wanted to drop. Every pylon turn required a precise calculation of bank angle, airspeed, and exactly the right back pressure - executed not by thought but by physical memory.

He also found that at full throttle, low and level, it was the fastest thing he had ever flown.

The 1932 Thompson Trophy Race

The field lined up on September 4, 1932, before a crowd of fifty thousand to a hundred thousand at Cleveland Municipal Airport.

Within the first half of the first lap, it was clear the R-1 was operating in a different category from the rest of the field. Doolittle banked around the first pylon and the crowd understood, wordlessly, that they were watching something they had never seen. The sound of the Wasp Senior at full throttle was not like other racing engines - deeper and harder, with a mechanical authority felt in the chest before the ears processed it. When the R-1 crossed the start-finish line in front of the grandstands, the pressure wave arrived first. The crowd flinched before the sound reached them.

He ran all ten laps.

When he crossed the finish line, his average speed was 252.6 miles per hour. The second-place finisher was more than a full minute behind. Doolittle had lapped most of the field at least once.

He made one low pass over the field. Then he landed, climbed out of the cockpit, and told the people around him that he was finished with competition flying. He was 35 years old.

Why Doolittle Never Raced Again

Doolittle said later that he had done the engineering calculation during the race itself. He understood with precise technical clarity what the margins were. The R-1 was an aircraft that would eventually claim any pilot who flew it with sufficient frequency, and it would do so without warning and without recourse. He had flown it once, perfectly, and won. The rational choice was to walk away from the table while ahead.

This was not sentiment. It was engineering.

What Happened to the Gee Bees

The R-2 was involved in serious accidents over the following months that injured multiple pilots. The R-1 changed hands after Doolittle’s retirement and was eventually destroyed in a crash. Every aircraft that carried the Gee Bee name in serious competition was ultimately destroyed. Not one survived.

The Granville Brothers Aircraft Company went bankrupt in 1934, battered by Depression-era economics and the legal exposure from accidents surrounding their designs. Granny Granville died that same year in a small passenger aircraft accident in New England. He was 34 years old.

Why the Gee Bee Still Matters for Aviation

The specific problems that made the Gee Bees lethal - the pitch instability, the poor forward visibility, the unforgiving handling at speed - became the design problems the next generation of aeronautical engineers had to solve. And they did solve them. The aircraft flown in the Second World War were better machines, in part, because men like Granny Granville had pushed the boundary to its absolute limit and documented, in the hardest possible terms, exactly where that limit was.

The Golden Age made a bargain: advances came fast because consequences came fast, and everyone involved understood both sides of the ledger.

Flying replicas of the Gee Bee Model R appear at major airshows today, built from original drawings and period photographs, some incorporating small engineering refinements that address the worst of the original handling characteristics. When one comes over a crowd at low altitude with a big radial at full power, it carries every bit of that history with it - a short yellow barrel with stubby wings and an enormous engine, out of a repair shop in Springfield, Massachusetts, flown once to the limit of what was possible by the one pilot with the skill to survive it and the wisdom to stop.

Key Takeaways

The Gee Bee Model R was built around an 800 hp Pratt and Whitney Wasp Senior in a 17-foot, 9-inch fuselage - a design philosophy that produced extreme speed at extreme risk
Lowell Bayles won the 1931 Thompson Trophy in the predecessor Model Z at 236 mph, then died three months later attempting a land speed record at approximately 300 mph
Jimmy Doolittle won the 1932 Thompson Trophy at 252.6 mph, lapping most of the field, then retired from competition flying immediately at age 35
Doolittle’s decision to stop was an engineering calculation - he understood the aircraft would eventually kill any pilot who flew it repeatedly, and walked away with a perfect record
Every Gee Bee built for serious competition was destroyed; the Granville Brothers company folded in 1934, the same year Granny Granville died at age 34 in an unrelated accident