- Nov 25, 2017
- Germantown, NY
- Magni M16
- Total Flight Time
As Vance points out, there does not have to be negative Gs to cause the rotor RPM to slow – anything less than 1 G will begin to slow the rotor.Back to my Dad's take off.... I believe the 3 changes in pitch attitude may have been attempts at trim adjustments or feeling the stick pressure. They are definitely not negative G, and I don't see how they could have caused a significant change in the rotor rpm.
With that powerful engine at full tilt, it may not have taken much forward stick/reduced G to lose enough rotor thrust (through reduced rpm) to suddenly lose roll stability. If there was actual retreating-blade stall, my guess is it probably happened after that initial right-hand roll.