Accident Details
An experimental helicopter experienced an engine malfunction while climbing out from takeoff. When the helicopter reached approximately 40 feet above the ground, the pilot was forced to initiate a landing. The pilot attempted to enter an autorotation configuration, but the low initiating altitude prevented the configuration from being fully established.
The helicopter touched down on a soft field, and its skids dug into the surface, causing the helicopter to roll over.
Engine Investigation
Post-accident investigation revealed that the engine malfunction resulted from a broken intake valve spring. No other contributing factors were identified in the available information.
Notes
The helicopter was experimental, and no information regarding the specific model, registration, operator, location, date, or time of day was provided. Occupant injuries, if any, were not specified in the source.