What happened
The pilot elected to perform a soft-field takeoff procedure, configuring the aircraft with 10 degrees of flap extension. During the roll, the aircraft became airborne at an indicated airspeed between 55 and 60 knots. According to the pilot's account, the aircraft failed to climb out of ground effect as expected. Recognizing that the remaining runway length was insufficient to safely abort the takeoff, the pilot increased the pitch attitude in an attempt to gain altitude.
Despite the increased pitch, the aircraft stalled. The loss of lift resulted in a collision with the ground, causing the aircraft to nosed over. The pilot reported that there were no prior indications of mechanical malfunction.
The investigation
A post-accident examination of the aircraft was conducted to determine the condition of the flight control systems and configuration. The inspection revealed that the flaps were found in the retracted position, contrary to the pilot's statement that they were extended for takeoff.