Vertical Magazine has an excellent and disturbing article by their own Elan Head dedicated to Robinson Helicopter's continuing saga of mast bumping in flight and inflight breakup that cannot be explained. It's page 65 of the above link. I didn't know how to get just the article to link here.
This is a very detailed investigation into the mystery surrounding Robinson Helis continuing to break up in normal flight for unexplained reasons.
Meanwhile, we are continued to be required to replace perfectly good blades with newer blades that fail. Even as Robby clearly cannot provide an answer to this deadly question of main rotor catastrophic failure in the normal flight envelop.
Member Since : 2012
and now there is SB19 that basically limits speed to 110knots, maybe for the same reason