On December 22, 2007, about 1230 mountain standard time, a Found Aircraft FBA-2C2, N418MS, operated by the pilot/owner, ground looped during landing rollout at the Holbrook Municipal Airport, Holbrook, Arizona. The airplane's left wing was broken and the fuselage was deformed. The airplane was substantially damaged. Visual meteorological conditions prevailed at the time of the personal flight, and no flight plan had been filed. The private pilot and one passenger received minor injuries, and two passengers were not injured. The flight was performed under the provisions of 14 CFR Part 91, and it originated from Winnemucca, Nevada, about 0815 Pacific standard time. The pilot reported to the National Transportation Safety Board investigator that no mechanical malfunctions or failures were experienced with the airplane, and the surface wind was light and variable. She reported that following a 3-point landing she reduced all engine power and pulled the stick back to keep the tail down. Despite applying right rudder to keep the airplane centered on the runway and not moving to the left, she was unable to maintain control. The pilot reported that she added full engine power too late and the airplane ground looped striking its propeller.