Incident Summary
A pilot flying from Greeley to Akron, Colorado, noticed smoke emanating from the cowling of the aircraft while en route. In response, he performed a precautionary landing on a beach adjacent to a reservoir. After landing, the pilot conducted an inspection of the aircraft but was unable to identify the source of the smoke.
Pilot Actions
Following a period during which the smoke dissipated, the pilot prepared for takeoff. He reported that all engine instrument indications were normal and that maximum engine power was being developed. The takeoff was executed as a short-field procedure. The pilot indicated that he lifted off prior to the "go-no go decision point."
Outcome
As the aircraft crossed over the water, it began losing altitude. The right wing dropped, and the aircraft struck the water surface, subsequently nosing over. The pilot later speculated that the smoke observed earlier might have been due to the "breaking in" of a newly installed muffler and exhaust stacks.