Approach and Ballooning
On approach to a private grass airstrip, the pilot encountered a light rain shower. The approach was set up with a light tailwind. As the airplane crossed the runway threshold, it suddenly ballooned upward approximately 50 to 60 feet.
Landing and Overrun
In response, the pilot pushed the nose down, diving the airplane toward the runway and landing with excess airspeed. After touchdown, the pilot applied the brakes. However, because the grass was wet from the rain, the brakes proved ineffective. The airplane subsequently veered off the runway and collided with rocks.
Mechanical Condition
No mechanical failures or malfunctions were reported in the investigation.