To: Dave Jackson
A. The Robinson has intentionally offset its pitch horn/link horizontally from the teetering hinge.
Answer to A)
Yes and no. The position of the pitch link / pitch horn connection point was dictated by the position of the cone (flapping) hinge. If you want to say intentionally that’s OK but the location was not arbitrary.
B. All conventional teetering hubs will unintentionally find that their pitch horn/link is offset vertically from the teetering hinge, when they are subjected to a large amount of collective.
Answer to B) Yes, but again I don’t like the word unintentionally because the design of the helicopter and the input of control dictate it.
C. In both cases, when the blade teeters up some of the pitch will automatically be pulled out.
Answer to C) Yes but it is true for all helicopters that have flapping hinges or an apparent flapping point
If the above is a correct interpretation of what you are saying, then I agree with you.
What you might want to do is sketch out the two situations. The amount of flap or teeter is relatively small and the blade is close to the horizontal, of course. Therefor you will find that a horizontal offset of 1/2" will change the pitch far far more that a vertical offset of 1/2" will.
If I understand your point above you refer to the horizontal displacement of the pitch link /pitch horn connection in relation to the hinge line. If that is what you mean the point of reference can be several feet outboard of the hinge and still not make any pitch change if the two points are coincident with each other. However if you move the point above (Vertical) the hinge line, when the blade flaps up, pitch will be removed.