Bill Hempel taxis his radio controlled Fokker DR1 tri-plane off the runway during Tucson International Modelplex Park Association (TIMPA) 2nd Annual Giant Scale Fly-In at Tucson International Modelplex Park, 3250 N. Reservation Rd, Marana, AZ. The majority of the planes are 1/4 scale. This plane is much larger at 65% scale and runs on a 48 HP, 550cc., 4-cylinder motor. Photo taken Saturday, November 9, 2013. Photo by Ron Medvescek / Arizona Daily Star.