The pilot of the tailwheel-equipped airplane stated that the purpose of the flight was to conduct touch-and-go landings on a north-oriented grass runway. After the first landing, he "misjudged the remaining takeoff distance" and was "a bit slow while trying to get airborne." As the airplane lifted off, it encountered a "gust" of wind from the left, then drifted to the right, contacted the runway, and nosed over. The airplane came to rest inverted, resulting in substantial damage to the left wing spar and horizontal stabilizer. The pilot reported there were no mechanical malfunctions or failures. The automated weather report at the accident airport reported winds from 330 degrees at 9 knots.