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 unique French experimental aircraft from the 1950s, designed with an unusual combination of features including a delta wing, jet engine, fixed gear, and wooden structure.
Designed by Roland Payen, its primary purpose was to serve as a minimalist testbed to evaluate his tailless delta-wing configuration, building upon his decades of delta-wing research.
Despite its small size and limited thrust, the Katy successfully completed 300 test flights by 1958, achieving respectable speeds for its class (e.g., 310 mph max speed).
The aircraft survived its comprehensive test program and is now preserved and displayed at the Musée de l'Air et de l'Espace in Paris.

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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.