To: Dave Jackson
“A question; how big a problem is this with the Bell”?
Response:
Which problem (not being smart it is just that I did not understand the question).
“A second question; What is going to make the Robinson's amount of flap/cone be anywhere near as great as the Bell's amount of teeter”?
Response:
First of all we must address the fact that both heads teeter. Just a wild guess but I would think that there would be a similar but scaled down teeter on the Robinson with the gross weight and comparative profiles being the difference that caused this. Now we can address the flapping. On the Bell you get pitch flap coupling when the blade teeters and on the Robinson you get pitch flap coupling when the blade teeters and when the blades flap. You would have to do a comparative engineering analysis to determine which helicopter has the greater amount of pitch flap coupling for their respective sizes.