At about 1105 eastern time, a Piper PA-44-180 was damaged when it hit a snowbank during takeoff from Wings Field Airport. The pilot and passenger were not injured. The pilot said he was accelerating smoothly down the 75-foot-wide runway when the airplane suddenly yawed to the right. He attempted to correct with rudder then retarded the throttles. The airplane departed the right side of the runway and hit a snowbank. A flight instructor witness said the right propeller appeared to be revolving at a much slower rate than the left propeller. Preliminary examination of the engines found no mechanical discrepancies.