I see nothing in the NTSB preliminary report to implicate the PSRU.

  Paul Lamar

  _________________________________________________________________________
  NTSB Identification: CHI08LA274
  Accident occurred Wednesday, September 03, 2008 in Findlay, OH
  Aircraft: Sadler Vampire, registration: N333SV
  Injuries: 1 Minor.

  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 September 3, 2008, at 1257 eastern daylight time, a Sadler Vampire,
  N333SV, received substantial damage on impact with terrain during a
 forced
  landing. The airplane experienced a total loss of engine power after
  takeoff from Findlay Airport, Findlay, Ohio. Visual meteorological
  conditions prevailed at the time of the accident. The 14 CFR Part 91 test
  flight was not operating on a flight plan. The pilot sustained minor
  injuries. The local flight was originating at the time of the accident.
  ________________________________________________________________

 I spoke to the people at Sadler.

 Bill Hobson


 I think Skip Gorman was there when it happened.

 Paul Lamar

Paul,
What sort of PSRU was that?
George ( own under)

I think it was made in New Zealand.

I am pretty sure it was an Auto Flight PSRU.
Which exact Model and gear ratio I am not sure.
I kind of doubt it was the gear box because it had a nice
rubber coupling and it had been flown before unless they
changed it out since Sun n Fun. Also Hornet flew it at least once.
Skip might know.
Of course there was a rather long drive shaft that could
have resonated and failed. That would not have been the first
time something like that happened. I don't think they will
ever figure it out as the burn was rather complete.

Paul Lamar