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Looking at the Physics of STOL Drag

Racing circuit's airplanes requires starting and stopping twice while flying less than a mile.

High wings and a tailwheel are taken for granted on STOL airplanes for a lot of practical reasons. [Leonardo Correa Luna]
Gemini Sparkle

Key Takeaways:

  • STOL Drag racing is a unique aviation competition where aircraft must take off, fly 2,000 feet, land, come to a full stop, turn around, and repeat the process, with the fastest total time, often just over 50 seconds, determining the winner.
  • Success in STOL Drag hinges on exceptional initial acceleration, efficient airborne segments, and particularly precise and rapid deceleration strategies, including slipping and immediate, effective wheel braking upon touchdown.
  • Serious competitors typically use highly modified light aircraft, such as the Carbon Cub and Just Aircraft Highlander, featuring powerful liquid-cooled, turbocharged engines (around 400 hp) and stripped-down designs for maximum thrust-to-weight ratio.
  • The race demands significant pilot skill to master the complex physics of asymmetrical acceleration and deceleration, critical timing for landings, and applying maximum wheel braking without losing control.
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At a point in my meandering journalistic career, I found myself behind the wheel of a Porsche 911 Turbo on a Southern California racetrack. One of the turns was a 90-degree elbow of essentially zero radius that came at the end of a long straightaway on which the sports car would reach 120 mph or so. The problem—which resembled the game of chicken in the 1955 film Rebel Without a Cause and which I was shamefully slow to master—was to use maximum braking just in time to arrive at nearly zero speed right at the corner, but not a moment sooner.

Slowing down matters as much as accelerating in most auto racing, and the same is true of STOL Drag racing. Unlike traditional Reno-style pylon racing, which involves no slowing down whatsoever, STOL Drag requires starting and stopping twice while flying less than a mile.

Peter Garrison

Peter Garrison taught himself to use a slide rule and tin snips, built an airplane in his backyard, and flew it to Japan. He began contributing to FLYING in 1968, and he continues to share his columns, ""Technicalities"" and ""Aftermath,"" with FLYING readers.

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