To: Irlandes
The crash analysis report you posted should be taken with a grain of salt. It first appeared on the website of a Robinson dealer in Connecticut, USA and is slanted in support of the Robinson design.
If you want to know the true facts log on to
http://www.ntsb.gov/publictn/1996/SIR9603.pdf
This is the NTSBs analysis of all of the loss of rotor control accidents up to the date of publication.