Is this a lack of a sway control device issue ? - Page 6 - Escape Trailer Owners Community

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Old 10-05-2014, 01:00 AM   #51
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currinh's Avatar
Join Date: Jun 2014
Location: Klamath Falls, Oregon
Trailer: Escape 19' 2011
Posts: 303

Originally Posted by Brian B-P View Post
I'm puzzled: the wheelbase (symbol "b") is given as 107", but the 2013 Xterra (and all years since 2005) are supposed to have a wheelbase of 110"
Could well be off a few inches. The other two need to be measured, particularly the rear tire contact to hitch ball, so I just measured all three.

Originally Posted by Brian B-P View Post
Referring to the diagrams and balance equations in Hugh's post #40... Given the dimensions, I agree with Hugh's calculation approach, which is to balance the sum of vertical forces for each situation, and balance the sum of moments (force times moment arm, or torque) for each situation.

My only concern with the equations is that the moments are not all summed around a consistent reference point. The only way the moments balance is if they are calculated with respect to the same centre of rotation.

In the trailer with WD, the weight is multiplied by "Xt", the hitch weight is multiplied by "t", and the axle load is omitted (mulitplied by the distance to the axle of zero), so they are the moments of the these forces around the axle, but the WD system torque is shown about the ball (as it must be to be equated to the WD system torque on the tow vehicle).
Similarly, the moments for the tow vehicle are summed around the rear axle... except the WD torque. Both trailer and tow vehicle moment sums could be calculated with respect to the ball, instead, and then the balance equations would be valid.

Hugh, does this make sense?
Thanks for looking at these.

I believe in the sum of the moments, torque, equations an applied moment can float or be applied anywhere for the same effect. Summing moments about the trailer ball we get the same results.
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Hugh Currin
2011 Escape 19
2013 Nissan XTerra
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