Originally Posted by
Agile
Can an EC135 do a roll or loop? Maybe one time to save your life, if you are unlucky enough to end up in that unusual attitude.
Can an R44 do a roll or loop?..... well, never mind ... isn't it that in the end The most important factor remains the rigid rotor head with offset flapping hinges.
Which the CH53 doesn't have. And with my pedant hat on, a rigid rotor doesn't have a flapping hinge at all (see post #1). Just a very high equivalent virtual hinge. But you are right - a rigid head is the best option.
The critical factor is the ability to develop and sustain enough g to get you round (loop) or the ability to survive the inverted position in a roll (hence teetering head fails).