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.

Josh Richling

Thursday, April 28, 2022 at 12:37 PM ET

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[Photo: Leonardo Correa Luna]

Key Takeaways:

STOL Drag competitions, particularly the gold class, necessitate highly modified experimental aircraft due to performance demands and the flexibility to implement extensive changes without regulatory hurdles.
Key modifications include powerful engines—ranging from heavily upgraded traditional aircraft engines to alternative powerplants borrowed from jet skis or snowmobiles—often coupled with propeller speed reduction units.
Other crucial enhancements feature smaller "tiny tires" for improved braking and weight reduction, specialized fuel systems, and aerodynamic devices like the "Henry Slip Flap" to optimize aircraft performance.
Despite the continuous technological evolution and ingenuity in aircraft modifications, exceptional pilot skill, judgment, and practice remain the most critical factors for achieving success and ensuring safety in the 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.