http://www.airsafe.com/events/celebs/denver.htm
http://www.answers.com/topic/john-denver
the experimental airplane he had was a Rutan Long E Z
a hand made plane that had the engine in teh back ( a "pusher")
http://www.airbum.com/pireps/PirepLongEZ.html
http://en.wikipedia.org/wiki/John_Denver