Narrative
The pilot reported that during cruise flight, the engine rpm decreased and the airplane began to shake. The pilot checked the gauges, throttle, mixture, magnetos, and fuel valve position but found no abnormalities. After notifying air traffic control of the loss of engine power, the pilot diverted to a nearby airpark.
Entering the traffic pattern, the pilot set up for a short field landing. However, due to a tailwind, sloping terrain, and excess airspeed, the airplane floated a considerable distance down the runway. Upon touchdown, the pilot realized there was insufficient runway remaining to stop and opted to turn off the runway onto a steep uphill taxiway.
During the rollout on the taxiway, the right wing struck trees, causing the airplane to spin 180 degrees.
Postcrash Inspection
A postcrash engine inspection revealed a broken exhaust valve on the number three cylinder. No other information was provided.