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The Hiller Hornet and its Ill-Fated Ring of Fire

With fire-breathing ramjets mounted to the tips of the main rotor, Hiller’s tiny Hornet boasted an endurance of approximately 30 minutes.

Because its tip-mounted ramjets created a visible ring of fire at night, the Hornet was deemed unacceptable for tactical use, as it could be so easily spotted by the enemy. [Courtesy: U.S. Army]
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Key Takeaways:

  • The Hiller Hornet was an experimental 1950s helicopter designed with ramjet engines on its rotor tips, which uniquely eliminated torque and the need for a traditional tail rotor.
  • Despite its innovative approach for simplified control, the Hornet suffered from critical flaws such as extremely high fuel consumption, limiting its endurance to minutes, and difficult autorotation characteristics.
  • Additional drawbacks, including the need for a separate starter engine, ground safety issues, and highly visible flaming exhaust trails, led to its rejection by the military after evaluations, with only 18 units ever built.
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For a time in the early 1950s, a small number of U.S. military pilots were able to claim their job was to fly experimental aircraft powered by ramjets that created streaks of flame and lit up the night sky. This undoubtedly created visions of sleek, supersonic machines such as the F-104 Starfighter and the F-106 Delta Dart, earning admiration and street cred in bars surrounding their respective bases. The bar patrons would surely have been transfixed.

Had they asked the pilots a few additional questions, however, the complete picture would have been revealed. They’d have learned that the aircraft type in question was a tiny helicopter called the Hiller Hornet. It utilized two ramjet engines to achieve a top speed of just 62 knots and had a maximum range of less than 30 miles. While perhaps not as flashy as the aforementioned supersonic interceptors, some might argue that it took more guts to fly the Hornet.

Jason McDowell

Jason McDowell is a private pilot and Cessna 170 owner based in Madison, Wisconsin. He enjoys researching obscure aviation history and serves as a judge for the National Intercollegiate Flying Association. He can be found on Instagram as @cessnateur.

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