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Mods for STOL Drag

As the sport gains traction, airplane modifications, such as tiny tires and the 'Henry Slip Flap,' give winners an edge—especially in the gold class.

[Photo: Leonardo Correa Luna]
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Key Takeaways:

  • STOL Drag competitions, especially the top-tier gold class, necessitate extensive aircraft modifications, with experimental aircraft dominating due to fewer regulatory hurdles for customization.
  • Key modifications focus on maximizing engine power (often adapting high-revving engines from other sports), reducing weight (e.g., "tiny tires"), and enhancing braking/drag capabilities (e.g., "Henry Slip Flap").
  • Despite rapid innovation in aircraft design and modifications, superior pilot skill, judgment, and continuous practice remain the most critical factors for success in this evolving sport.
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Like a car tuned for a particular kind of race, the airplanes that compete in STOL Drag events need an extra touch—whether their pilots take the starting line at Reno, High Sierra, or any of the local meets in between.

At the top of the competition, in the gold class, a stock aircraft is officially a thing of the past. While a stock—albeit stripped—aircraft could potentially capture a podium position in the bronze class, the gold class requires much more modification to be competitive.

Josh Richling

Josh Richling is a crew chief in the National STOL Series. He covers STOL competitions for FLYING.

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