X-Mozilla-Keys:                                                                                 
What kind of engine stops when there is no flywheel?

What does the NTSB have against saying what kind of engine is on
the airplane?

Paul Lamar



NTSB Identification: NYC99LA184

                       Accident occurred JUL-26-99 at BERLIN TOWNSHIP,
OH
                           Aircraft: Troy PIETENPOL, registration:
N6286A 
                                     Injuries: 2 Uninjured. 

 This is preliminary information, subject to change, and may contain
errors. Any errors in this report will be corrected when the
                                  final report has been completed.

On July 26, 1999, about 0830 Eastern Daylight Time, a homebuilt
Pietenpol, N6286A, was substantially damaged during a forced
landing at Berlin Township, Ohio. The certificated private pilot and
passenger were not injured. Visual meteorological conditions
prevailed for the flight that originated from a private grass airstrip
at Valley City, Ohio; destined for Wittman Region Airport,
Oshkosh, Wisconsin. No flight plan was filed for the personal flight
conducted under 14 CFR Part 91. During a telephone
interview, the pilot stated that he was in cruise flight approximately
2,000 feet mean sea level. The engine lost all power, and he
made a forced landing to a soybean field. During the landing, the left
main landing gear folded under the airplane, and the right
wing spar fractured. He further stated, examination of the wreckage
revealed four bolts, which secured the propeller, were
sheared. The respective four nuts and propeller were not recovered. The
pilot believed that fatigue caused one bolt to shear, and a
subsequent vibration occurred. The vibration caused the remaining bolts
to shear. On this particular airplane, the propeller acted
as a flywheel. The pilot stated that the absence of a flywheel would
cause the engine to stop. The pilot last secured the propeller
to the airplane approximately 1 year before the accident. Since then, he
estimated that the airplane flew approximately 40 hours. 

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