New Andersen WD hitch
A fellow camper bud showed me this. It's new and different. Anyone using one? Andersen WD hitches A U-tube video with the factory guy explaining it. You have to get past MR Truck doing his...
Forum Discussion
BenK wrote:I believe the new SAE J2807 Recommeded Practice for towing performance requires a SRW TV, operating at its GCWR, should be able to accelerate from 0 to 30 mph in 12 seconds. The corresponding acceleration, assuming it is constant, would be 3.7 ft/sec/sec or approximately 0.11 G. The force required to accelerate an 8000# TT at 0.1 G would be 880#.
Think there is another metric and that is during acceleration.
Would that then pull the ball away from the coupler back side to transfer the loading to the coupler front side?
How much is the force during acceleration and will that over come the tension of the plastic springs ?
Even if a TV could achieve twice this rate of acceleration, is seems unlikely that the combined acceleration force, aerodynamic drag, and rolling resistance would ever be great enough to exceed the forward thrust of the coupler against the ball.
Would there also be enough force to repeat this during the drive? Guess dependent on the frontal area of the trailer and other drag vs the TV pulling to a higher speedI believe SAE 2807 also specifies a TV should be able to accelerate its GCWR from 40-60 mph in 18 sec. The corresponding acceleration would be about 0.03 G. Again, not at all likely that the coupler would be pulling rearward against the ball.
With my setup and the controller leading the trailer braking, that would also have the trailer pull the coupler off the back side.Not sure what controller you have. Let's assume the leading "boost" is set to 20% of maximum TT braking force. That probably means the boost-related braking force would be about 10% of the TT's weight.
If we assume the TV weighs 7000# and the TT weighs 8000#, the boost braking would decelerate the combination at about 800/15000 = 0.05 G. In addition to decelerating itself, the TT would be pulling rearward against the TV with a force of about 350#. Again -- not nearly enough to overcome the forward thrust of coupler against ball.
Also assume the contact area of the plate steel hole and the ball tail end would not work itself. That the contact area is sufficient to distribute that constant load change from working the metal contact area.I don't know what you mean by this, so I cannot comment.
Ron
