Flight Details
The pilot reported that during the preflight run-up, everything seemed normal. Using short-field takeoff procedures, the pilot rotated the aircraft at 40 knots. After reaching an altitude of about 10 feet above ground level, the aircraft did not accelerate to the best angle of climb speed of 54 knots. The pilot aborted the takeoff. The aircraft continued off the end of the runway, went down an embankment, and sustained damage.
Examination Findings
An examination of the aircraft revealed that a spark could not be obtained from the top spark plug in the #2 cylinder. Additionally, excessive buildup of lead deposits was noted on the bottom plugs. The pilot noted no decrease in power during the takeoff.
Weather Information
The density altitude was estimated to be 2958 feet. The pilot reported the wind was from the northwest at 10 knots. At Wausau, Wisconsin, the 1950 CDT wind was from 220 degrees at 5 knots.