The pilot of the tailwheel and tundra tire-equipped airplane reported that, during takeoff on an off-airport field, the airplane had climbed 15 to 20 ft above the ground, but then began to descend. He reported that a wind gust "pushed" the airplane down. He then verified that the engine was at full power and attempted to climb, but the airplane's left wheel struck the ground, the airplane veered left, and came to rest in a ditch.

The airplane sustained substantial damage to the fuselage and both wings.

The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.

The pilot reported that the wind was light and variable, gusting to 8 to 10 knots.

The pilot added that when the airplane was "hit" by the wind gust, the notch of flaps he was using "dropped out." He then verified full power and attempted to "grab [the] notch of flaps but [he] wasn't fast enough."