What happened
During the final approach phase of flight, the pilot transitioned onto the approach at an airspeed of 80 knots, utilizing what he believed to be 20 degrees of flaps and setting the power to 15 inches of manifold pressure. As the aircraft flew over trees located prior to the runway threshold, the pilot heard the stall warning indicator activate.
In response to the warning, the pilot applied full power; however, the airplane impacted the runway. Following the initial impact, the aircraft bounced, causing the right wing to strike bushes situated along the side of the runway. The pilot was not injured.
The investigation
An examination of the aircraft following the accident revealed that the flaps were actually in the 30 degree position, rather than the 20 degrees believed by the pilot during the approach. The pilot noted that he had no prior experience landing the aircraft in this specific configuration.