Approach and Yaw Condition
A private pilot was at the controls during the landing approach, with another private pilot acting as a safety/lookout. The pilot held the airplane in a yaw during the approach. The safety pilot looked through the rear window to monitor another airplane that was behind them. The safety pilot became concerned about the proximity of that airplane and watched as it overflew their position during the flare.
Loss of Directional Control
When the safety pilot looked forward, he noticed the airplane was still in a yaw condition and not aligned with the runway centerline. The pilot attempted to correct the yaw during the flare but landed in a side load condition on the left main landing gear. The airplane subsequently veered off the runway.
Collision with Parked Aircraft
The safety pilot attempted to take control of the airplane, but it continued into the ramp area and collided with two parked aircraft. The accident airplane and one of the parked aircraft sustained substantial damage. The pilots reported no preimpact mechanical malfunctions or failures with the airframe or engine that would have precluded normal operation.