Earlier, George Vranek wrote:

Does somebody know why the Peter Masak crashed?

Tom Knauff has retraced his flight in a motorglider,
and arrived at what I believe to be a credible explanation
of the sequence of events depicted in the flight recorder
data. The final event was probably a spin, but I don't
think we can ever be certain what precipitated it.

Thanks, and best regards to all

Bob K.
http://www.hpaircraft.com/hp-24