Forum Discussion
bettered wrote:
--- But it's my opinion that there's a significant difference between some lateral force resisting sideways movement of the TT through the tires, and no resistance at all.
Ed,
I agree. And what I'm saying is that, for a rolling tire, unless there is some yaw angle, there is no resistance at all.
If a TT has a CCW yaw, a tire's lateral force acts to the TT's left. If a TT has a CW yaw, the tire's lateral force acts to the TT's right. The magnitude of the lateral force is proportional to yaw angle and must pass through zero when the yaw angle is zero.
Because the sine and tangent for small angles are nearly identical, I'm of the opinion that a sideways movement at the tires (on dollies - i.e. no resisting force at all) would initially translate the rear link of the HA and thus get our rotational / translational sequence started.
I agree that, if there is no resisting force from the tires, then the TT is free to swing and the linkage will rotate/translate. However, as soon as the yaw angle is non-zero the tires will generate lateral force and will control the amount of yaw.
Ron
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