Event Details
During arrival, the pilot contacted Sedona unicom and was advised that runway 21 was in use and that the winds were gusting to 25 knots. The pilot reported strong turbulence throughout the traffic pattern. Full flaps were lowered on final approach.
Approach and Landing
A strong downdraft was encountered on final approach, and power was increased 'to maintain vasi and vref.' Turbulence and a downdraft were reported to be exceptionally strong over the threshold. The pilot stated the aircraft touched down on all three gear, then it pitched up and began to porpoise with increasing amplitude.
Attempt to Recover
On the second touchdown, power was applied, but the engine needed 5 to 7 seconds to spool up. The pilot said that after the aircraft porpoised three times, it was in a stall from which it would not recover.
Outcome
Subsequently, the aircraft went off the right side of the runway, crossed a parallel taxiway, and entered a wooded area before stopping. No mechanical problem of the aircraft was reported that would have resulted in the accident.