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The first of Otto Kauba's prototypes, the SK V1A, was intended as a predecessor of a flying bomb, and was the first aircraft to feature the unique trailing elevons.
After a cursory inspection of the SK V I A, the German pilot refused to fly the "strange contraption". Another German pilot, an instructor from the Luftwaffe's flying training school at Vyskov in Moravia, was asked to undertake the flight testing, but he too refused, and in desperation, Kauba approached the management of the Skoda Works to find him a pilot. Accordingly, Petr Siroky, Avia's chief test pilot and a well-known Czech aerobatic pilot, was ordered to undertake the initial flight trials.
Having discovered the eventual purpose of the aircraft, Siroky, too, refused the task, but veiled threats and suggestions of Gestapo interest in himself and his family resulted in what appeared to be a change of heart. In fact, Siroky, with Avia director Cajthamel, was already planning the deliberate destruction of the aircraft, and after a few taxying trials across the Prague-Gbely airfield, Siroky did actually take-off, but as soon as he was airborne he began to switch the ignition on and off so that onlookers would think that the engine was behaving erratically. Then, finally cutting the power completely and with the airscrew windmilling, he put the nose down and bounced the aircraft on its nosewheel. The aircraft somersaulted several times and finally came to rest on its belly, the undercarriage having been wiped off. Siroky was carried unconscious from the wrecked aircraft, but Kauba was suspicious and immediately accused the pilot of sabotage. Fortunately for Siroky, Cajthamel intervened and Kauba dropped his charges.
... En toch is het geen Grumman...maar een Boeing XF8B-1. ...