What happened
On 24 April 2004, a private flight was being conducted in an RAF 2000 GTX-SE, registration G-REBA, from a field located near Stoke Gabriel, Devon. The weather conditions were characterized by good visibility, minimal wind, and an ambient temperature of roughly 20°C.
The pilot prepared for takeoff using a 185-metre runway available in the field. After taxiing with the prerotator engaged, the pilot initiated the takeoff roll to increase rotor RPM. Once the rotor reached 200 RPM, full power was applied. The aircraft lifted off at approximately 45 mph as the rotor RPM reached 270.
While the aircraft accelerated to 50 mph, it failed to achieve the anticipated climb rate. As the aircraft passed over a hedge at the end of the takeoff area, the pilot suspected a collision with an obstacle. Seeking to land safely, the pilot attempted an immediate landing in a nearby small field. The aircraft made a heavy touchdown on the left wheel and subsequently rolled onto its right side, causing the rotor to strike the ground. The pilot was able to exit the aircraft without injury.
The investigation
Investigators examined the aircraft and the site of the accident. Upon inspecting the hedge that the aircraft had just cleared, the pilot identified a small sapling, which had been protruding two feet above the hedge, had been snapped by the aircraft.
Findings
- The aircraft sustained damage to the rotor, propeller, right door, rotor mast, and wheel axle.
- There were no injuries to the pilot.
- The pilot had failed to account for how the higher temperature and lack of wind would negatively impact the aircraft's ability to climb during the takeoff phase.