The Granville Brothers, the Gee Bee Model R, and the Most Dangerous Airplane the Thompson Trophy Ever Saw

The Gee Bee Model R was the fastest piston-powered landplane in America when Jimmy Doolittle flew it to a Thompson Trophy record of 252.6 mph on September 5, 1932. Built by five brothers with no formal engineering degrees in a converted Springfield, Massachusetts garage, it was an airplane designed around a single absolute priority: speed. Everything else - stability, survivability, forgiveness - was secondary.

Who Were the Granville Brothers?

Zantford Granville - known to everyone in Springfield as “Granny” - was the eldest and the driving force behind Granville Brothers Aircraft, founded in 1925 in Springfield, Massachusetts. His brothers Thomas, Mark, Robert, and Edward rounded out the team. None held formal aeronautical engineering degrees. What they had was mechanical intuition, an obsession with speed, and no one around to tell them their ideas were impossible.

The company name was too long for anyone to bother with. Granville Brothers became G.B., became Gee Bee - and just like that, they had a brand.

The early models were conventional sport biplanes, respectable performers by the standards of the late 1920s. But Granny Granville had bigger ambitions, and bigger ambitions in that era pointed in one direction: air racing.

Why the Thompson Trophy Mattered

The National Air Races were the Super Bowl and the Indianapolis 500 combined, staged when aviation was still new enough to feel genuinely miraculous. The Thompson Trophy was the main event: a closed-course pylon race, low altitude, full throttle, aircraft carving tight turns around markers in front of crowds who could feel the prop wash from the grandstand.

To win the Thompson, you needed power and low drag. Low drag meant wrapping the fuselage as tightly as possible around the biggest engine you could find, then cutting everything else down to the absolute minimum. The Granvilles took that logic to its furthest possible conclusion.

The Model Z and Lowell Bayles’s World Speed Record

The Gee Bee’s first statement to the aviation world came through the Model Z. In November 1931, pilot Lowell Bayles flew the Model Z over a measured course at Waseca, Minnesota and set a new world landplane speed record: 296.5 mph.

For context: commercial airliners of the era cruised at around 100 mph. Military pursuit aircraft topped out near 200. Bayles had just flown a piston-powered propeller airplane at nearly 300 mph - a figure that reset what the aviation world believed was possible.

Three weeks later, Bayles returned to push the record past 300 mph. The fuel cap departed the aircraft under aerodynamic load, struck the windshield, and the Model Z went in. Bayles was killed instantly.

The Granvilles grieved. And they kept building.

What Made the Gee Bee Model R So Fast - and So Dangerous

The Model R came in two variants: the R-1 and the R-2. The R-1 carried a Pratt & Whitney Wasp Senior producing approximately 800 horsepower. Its specifications were extreme by any measure: 25-foot wingspan, 275 square feet of wing area, and a fuselage barely 17 feet long. The enormous radial engine occupied the front third of the aircraft. The cockpit sat at the rear third, so far back that pilots were nearly looking straight down at the runway on landing. Everything in between was fuel, structure, and mechanical intent.

The shape was deliberate. Minimum frontal area, minimum fuselage length, maximum power. The result was faster than anything else on the ramp - and deeply, fundamentally unstable.

A tail surface needs distance from the wing to generate meaningful control authority. Shorten the fuselage enough and the tail loses its leverage. The center of gravity sits dangerously close to the neutral point - the edge of controllability - and sometimes behind it. Pilots reported that the R-1 demanded constant active control input. There was no trimming it out and relaxing. The airplane was always probing for an opportunity to depart controlled flight.

At the low speeds of approach and landing, the already-thin margin shrank further. At racing speeds, any departure was unsurvivable.

Jimmy Doolittle and the 1932 Thompson Trophy

James Harold Doolittle is remembered today primarily for leading the April 1942 raid on Tokyo, flying B-25 Mitchells off the deck of USS Hornet. But in September 1932, he was arguably the finest aviator in America - a man who held a doctorate in aeronautical science from MIT and had made history in 1929 by completing the first fully instrument flight: takeoff, navigation, and landing conducted entirely by reference to cockpit instruments, without ever looking outside.

He understood exactly what the Model R-1 was.

Doolittle said later that the airplane had to be flown every single second. No relaxing the grip. No letting it settle. It wanted to depart, and departing at those speeds was fatal.

On September 5, 1932, he strapped into the R-1 and flew the Thompson Trophy course - a closed circuit around pylons, roughly five miles per lap, aircraft flying wingtip to wingtip in front of 50,000 spectators in Cleveland. He finished at an average speed of 252.6 mph, a new Thompson Trophy record.

He climbed out, congratulated the other pilots, and announced he was finished racing. He had done what he came to do. He was walking away.

The Casualties That Followed

Not everyone had Doolittle’s judgment or his training.

The R-1 killed its next significant competitor, Russell Boardman, in 1933. The R-2 accumulated a series of crashes through multiple pilots. Experienced mechanics refused to fly the surviving airframes for any consideration. Post-accident analysis was straightforward: insufficient tail authority, center of gravity at or behind the stability limit, and departure characteristics that exceeded pilot response time.

The airplane was not poorly designed. It was designed exactly to do what the Granvilles wanted - go as fast as a piston airplane could go. The price of that priority was everything else.

Zantford Granville did not survive to see the end. He died in a crash in 1934 during a demonstration flight in Springfield, flying a different aircraft. Without Granny, the company lost its direction. Granville Brothers Aircraft wound down before the decade ended.

Why the Gee Bee Became an Icon

By any rational measure, the Gee Bee should have been forgotten. It was never a production airplane, never sold commercially, and it killed more people than it was comfortable to count. The company went out of business before World War II.

Instead, scale models of the R-1 sit on bookshelves in pilots’ offices across the country. Full-scale replicas have been built and flown. The yellow-and-black paint scheme is instantly recognizable to anyone who has spent ten minutes in an aviation museum.

The reason, arguably, is honesty. The Gee Bee did exactly what it was built to do - without compromise, without apology, without electronic assistance. It asked everything of the pilot and delivered everything it promised. The golden age of aviation was an era when the relationship between pilots and machines was physical, immediate, and sometimes mortal. There were no computers watching the attitude indicator. There was the stick, the throttle, the rudder pedals, and whatever the pilot knew in his hands after years of flying.

Doolittle had the analytical intelligence, the physical skill, the aeronautical engineering doctorate, and the instrument rating - a rare combination that let him manage the R-1 the way you manage a horse that might kill you: with authority, with respect, and without a single moment of inattention. Most pilots are not James Doolittle. The Gee Bee had no patience for anyone who wasn’t operating at that level.

That, in miniature, is the story of the golden age. Brilliant engineering in service of a single goal, pursued without reservation, producing results that redefined what was possible - at a cost that would not be acceptable today. Five brothers in a converted garage in Springfield built the fastest landplane in the world. For one September afternoon in Cleveland, with the right pilot in the seat, they owned the sky.