Lu,
I should have removed the tail rotor paragraph from Beaty's post, 'cause I know very little about them, and do not want to. The tail rotor is about to become a historical relic.
Should have probably removed his math paragraph, as well.
My limited understanding is that collective pitch change is wanted in a tail rotor but teetering or flapping is an undesirable. They use delta-3 to minimize the flapping. 45-degrees will eliminate any pitch change caused by flapping. 60-degrees will put in an opposing pitch, which will drive the blade back to the "home position'. You are probably correct, and my guestimate of 45-degrees was wrong.
While discussing delta-3, there are two different ways of implementing it.
See the two sketches at the top of this web page.
[A/ By flap hinge geometry] has the lead/lag component in it, which you refer to.
[B/ By control system geometry] is the arraignment that Robinson uses in its main rotors.
____________________
Meanwhile, back on track.
The initial post on this thread was an attempt to see if lateral cyclic is required, when the stick is being advanced on hovering craft, which has a basic teetering rotor. No practical answer has yet been give, but Prouty seems to imply that lateral cyclic is not required at this point in time.
If this is the case, then what heck is "Wee-wa' and where is this number one problem that Frank Robinson apparently sees?