Lu,
I agree with what you are saying, and more. Actually, a variation of the collective will change the coning angle and thereby slightly affect the pitch-flap coupling in both A/ and in B/. You are also correct in that Robinson's flapping/coning hinges could affect the pitch-flap coupling.
But, this thread is not specifically about the Robinson. In addition, bring in Robinson's flapping/coning hinges will make a complex subject even more complex. Lets just discuss pitch-roll cross-coupling, and include Frank Robinson's related 'Wee-wa'.
In fact, it looks like Mr. Robinson may have created the word, and if so, he is the only person who can define it.
Heedm,
I do not fully understand your comments, but like you, I am beginning to disagree with the quoted statement by Frank Robinson.
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To try to keep this thread on topic, I am going to start a separate thread on delta-3 and phase-lag. It will be the definitive answer to both subjects
and it should answer Lu's running question about 'what happened to the remaining 17-degrees of teetering'.
