The gyroplane pilot reported that during landing, the gyroplane was too high above the runway. He attempted to, "cushion the landing" by forcing the nose up as he, "gunned the engine a couple of times." The fluctuations in torque turned the nose of the gyroplane to the right, and he corrected with a hard-left rudder application. He recalled that the additional thrust from the engine gunning, increased the gyroplanes airspeed. The gyroplane was configured with the front wheel being mechanically linked to the rudder for directional control. When the gyroplane touched down, the pilot's hard left rudder application was also a hard-left turn input. The gyrocopter landed hard and rolled on to its side. The pilot reported that this accident was caused by pilot error. The nearest METAR was 12 NM to the northeast and reported that about the time of the accident the wind was from 170° at 4 knots. The pilot landed on runway 33 and would have produced a left quartering tailwind during the landing. The gyroplane sustained substantial damage to the main rotor drive system and the empennage. The pilot reported that there were no preaccident mechanical failures or malfunctions with the gyroplane that would have precluded normal operation.