On August 15, 1998, at 1521 central daylight time, a Wakely DR-107 (One-Design) amateur built airplane, N207TW, sustained substantial damage during an off airport landing, following a propeller strike on the runway, while on a test flight, at Stanton, Minnesota. The ATP rated pilot received minor injuries. The personal 14 CFR Part 91 flight was operating in visual meteorological conditions. No flight plan was on file. The local flight originated about 1500. The pilot said in his written statement that the purpose of the flight was to conduct touch and go landings. He said that on the fourth or fifth landing he attempted a wheel landing; however, when the airplane bounced and he aborted the landing. He said that during the climb the airplane experienced a vibration which he said, "... increased in intensity." He then initiated a forced landing in a crop field adjacent to the airport. During the rollout in the crop field, the airplane nosed over. Subsequent to the accident an examination of the airplane revealed that the propeller had damage which was attributed to contact with the terrain during the previous landing. No other pre-existing anomalies were found.