The pilot was practicing takeoffs and landings when the accident occurred. On the fourth landing roll, while at an airspeed of about 30 miles per hour, the airplane veered to the left. The airplane departed the runway surface at a 90 degree angle and the right wing sustained substantial damage when it contacted the terrain. The airplane made a 360 degree turn in the grass prior to it returning to the pavement. The pilot reported the airplane had a tendency to swerve on the ground especially on hot days with little to no wind. The wind at the time of the accident was reported as calm. The pilot reported that there was no mechanical failure/malfunction of the airplane that would have resulted in the loss of control.