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Old 08-12-2008, 11:00 AM   #15
4 Rivet Member
Livingston , Texas
Join Date: Dec 2007
Posts: 394
Isn't English a marvelous language? So many ways to use words and so many ways to misuse words. So many opportunities to inform and so many opportunities to misinform.

A strut of a HA is a structural component of a mechanical system. In structural terminology, a strut is an element used to brace or strengthen a framework by resisting longitudinal compression. In structural terminology, "tension" and "compression" have distinctly different meanings.

I assume there are some readers who actually are curious about how the tongue of the HA is prevented from pivoting on the ball. If so, it is misleading to say that the struts are in tension.

A strut cannot pull rearward on the pin which attaches it to the HA's upper unit, as is implied by saying a strut is in tension. A strut can only push forward against its pin because the strut is in compression.

Since a HA strut can only be in compression and never in tension, only one strut is working at any given time to resist rotation of the coupler on the ball.

Originally Posted by 2airishuman View Post
---now back to the context of my wording....

TENSION is used in contrast to RELAXED relating to the strut bars and THAT's the important notion....
For anyone who really wants to understand how the HA works, the important notion should be the direction of the force exerted on the upper unit by the struts. If you imply the strut is in tension, you imply the wrong direction for the force.

Originally Posted by 2airishuman View Post
besides, when the strut bars are 'screwed longer'....

-there is compression in the threading, and outer pin shafts..

-BUT there is also tension (stretching) of the pin holes and lengthening of the strut arms...
Yes, there is "lengthening of the strut arms". But, the lengthening places the strut in compression and not in tension.

Originally Posted by 2airishuman View Post
---so whlie compression and tension are in play the result is reduced trailer yaw force transmitted forward into the tv.
Since a strut cannot transmit a tensile load between the TT and the HA, strut tension is not in play.

I don't know what you mean by "trailer yaw force". A TT can exert a lateral force on the HA; and the HA's linkage causes this force to be "projected" forward closer to the TV's rear axle; thereby producing less "steering torque" on the TV.

The HA's linkage does not reduce the magnitude of the force. It simply changes the point of application of that force.


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