At about 1230 Eastern time the airplane was substantially damaged during an aborted takeoff. Neither the CFI nor the Student pilot were injured; visual conditions prevailed. The pilots were attempting a short-field takeoff, during which the CFI simulated an engine failure. The Student pilot reduced power on the good engine and began braking. The CFI then instructed the Student pilot to resume the takeoff. The Student advanced both throttles and attempted to rotate the airplane at an airspeed of 63 knots but it did not climb. The flight instructor then reduced the throttles and began braking. The airplane rolled off the end of the runway, through a ditch, and came to rest in a field.