The pilot made a normal approach for a landing uphill with 10 to 15 knots of wind from the left rear. As the aircraft crossed a gully on short final it encountered a strong wind gust. The starboard wing dropped and the aircraft descended rapidly. It touched down heavily just short of the threshold. The pilot applied full power, executed a go-around and returned to Bairnsdale. Immediately after the flight the pilot noticed that the blade tips of both propellers had been bent aft. At a later date, less obvious distortion of the fuselage and the right wing was detected. It is highly probable that the aircraft encountered a strong windshear on short final.