The Payen Pa 49 Katy was a small experimental French turbojet powered tailless aircraft, first flown in 1954, was the first French aircraft of this kind and the smallest jet aircraft of its day.
The first flight of what was now the Pa 49A took place on 22 January 1954 at Melun-Villaroche flown by Tony Ochsenbein, a comparatively inexperienced pilot, who had previously logged only 30 minutes on jets. Ten hours of manufacturer's testing was followed, in April 1954, by assessment at the Centre d'Essais en Vol (CEV), Brétigny-sur-Orge. The aerobatic ability of the Pa 49 was established. At the CEV it was fitted with a split rudder airbrake;
the two surfaces of the rudder separated from just below the tip,
driven via faired external links near the bottom, into a V at the hinge
for braking, rotating together for yaw control. This airbrake was designed by Fléchair SA, a company founded by Payen.
At the time of its appearance at the 12th Salon International
d'Aeronautique at Paris, in 1957, the undercarriage legs were faired and
the main wheels enclosed in spats and the aircraft renamed the Pa 49B. For a time the nosewheel was also spatted. There were plans for a version with a retractable undercarriage, but this did not come about.
When the flight testing programme ended in 1958 Payen gave the aircraft to the Musée de l'Air et de l'Espace at Paris - Le Bourget Airport. He continued to design delta winged aircraft and the Payen Pa 71 and Pa 149 projects of the 1970s were direct developments of the Katy.
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