mark_;
I would like to ask this though: Regarding Lu's thoughts on the Robinson rotor head design, how much merit is there to his claims, especially regarding his claims that the design should have never been approved.
A non-technical reply:
A Mr. Chuck Beaty is a technically competent individual who has been in the rotorcraft field for a long time. He too has questioned the soundness of applying delta3 to a main rotor.
This is not meant to imply that the Robinson head is good or bad. There are many styles that have been used and each has its pros and cons, plus its supporters and detractors.
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It appears that the Kaman helicopters are the only other ones that use delta3 in their main rotor hubs.
IMHO, it is Kamans use of delta3, combined with the servo-flaps, that was responsible for creating the illusion that the Intermeshing configuration is a soft and slow one.
Dave J