At about 1150 eastern time, a Champion 7ECA struck a parked vehicle while landing at the Minute Man Air Field. The pilot and passenger suffered minor injuries. The pilot was landing on runway 30 when the airplane began to porpoise and veer to the right. The pilot added power but the airplane departed the right side of the runway and struck a car. Winds reported at an airport about 11 miles east were from 120 degrees at 8 knots.