Posted for "Mark Ravinski" <mjrav@comcast.net>:

 Peter,
 I used the 72" Hartzell for 900 hours uneventfully.  Then I dinged the tips
when rolling across a frost heave dip on a paved ramp at Westerly, RI that was
virtually invisible because of the surface texture and lighting.  The prop
shop trimmed it to 70" and no problem since.  I do think I raced a little
faster when it was longer though.
 
 Mark Ravinski
 LNC2 360  1435 hrs