Background
The pilot had been flying locally for approximately 45 minutes to practice airwork before returning to the airport with the intention of practicing short-field landings on the turf runway.
First Two Landings
For the initial two landings, the pilot used a consistent procedure: deploying 10 degrees of flaps abeam the threshold on the downwind leg and adding full flaps just prior to touchdown to 'lift' the aircraft to the touchdown point. Both landings were uneventful.
Third Approach
While on base leg for the third approach, the pilot judged that he was too high. To compensate, he extended flaps to 20 degrees. When full flaps were added just prior to touchdown, the aircraft nosed down and struck the ground short of the end of the runway. The impact caused the nose gear to collapse, and the aircraft nosed over, coming to rest inverted.
Pilot Comments
The pilot stated that he should have added power to reach the runway instead of relying on the flaps to 'lift' the aircraft to the touchdown point.
Damage
The aircraft sustained damage including a collapsed nose gear and an inverted resting position.