SHK 1 Vorfall am Schänisberg: Pilot nach Trudeln verletzt
Am 30. April 1967 war ein Schempp-Hirth SHK 1 Segelflugzeug in einen Unfall am Schänisberg, Schweiz, verwickelt. Nach einem dreistündigen Flug geriet das Segelflugzeug während einer Kurve ins Trudeln und stürzte auf einem bewaldeten Hang ab. Der Pilot erlitt schwere Verletzungen, überlebte jedoch. Die Untersuchung bestätigte, dass das Trudeln durch unzureichende Geschwindigkeit während der Kurve verursacht wurde.
- Cruise ridge soaring: After about three hours of soaring in good thermals, the pilot was ridge-soaring in weak lift along the northwest slope of the Schäniserberg with the wooded steep hillside close on his right.
- Low speed in turn: While flying along the slope the pilot was using approximately 75 km/h, the speed for minimum sink, which was below the minimum safe speed for a 45° banked turn in this glider.
- Stall entering turn: During a left turn at about 45° bank with insufficient airspeed, the controls became soft and the glider began to drop its left wing and depart into a spin.
- Attempted spin recovery: The pilot neutralized the ailerons, pushed the stick forward, and applied full opposite rudder, briefly stopping the rotation and putting the glider on a southwest heading.
- Spin re-entry near slope: Concerned by the rapidly approaching terrain, the pilot applied right aileron to turn away from the slope, causing the glider to enter another left spin with insufficient height to recover.
- Crash - serious injury: After completing a total of about three spin turns, the glider impacted trees on the steep wooded slope of the Schäniserberg and was destroyed, and the pilot sustained serious injuries.