Payen Pa-49 Katy Remains a Study in Aircraft Minimalism

With a delta wing, jet engine, fixed gear, wooden structure, and less thrust than a Cessna 172, the bizarre combination of specifications is shared with no other aircraft.

Jason McDowell

Tuesday, February 04, 2025 at 11:01 AM ET

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While the Pa-49’s inboard elevators and outboard ailerons functioned separately, the rudder doubled as a speedbrake. [Credit: J. Harvard]

Key Takeaways:

The Payen Pa-49 Katy was a uniquely designed and minimalist French delta-wing jet aircraft from the 1950s, notable for its small size, wooden structure, fixed gear, and surprisingly low-thrust engine.
Designed by Roland Payen, its primary purpose was to serve as an experimental testbed for evaluating the tailless delta-wing configuration, undergoing a successful 300-flight test program between 1954 and 1958.
Despite its modest power, the Katy achieved respectable speeds (up to 310 mph) and is now preserved at the Musée de l'Air et de l'Espace, representing the culmination of Payen's delta-wing design legacy.

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If you’ve ever played the aviation version of 20 Questions with your friends, where they ask yes/no questions to determine the aircraft type you have in mind, give the Payen Pa-49 Katy a shot. With a delta wing, jet engine, fixed gear, wooden structure, and less thrust than a Cessna 172, the bizarre combination of specifications is shared with no other aircraft, and it’s doubtful anyone would ever arrive at the correct guess.

The Katy was designed by French aerospace engineer Roland Payen in the early 1950s. Reportedly named after his youngest daughter, it first flew in 1954 and progressed through a comprehensive test program to evaluate the performance of its tailless delta-wing configuration through 1958.