Hensley Arrow: How does it REALLY work?
There have been several discussions on this hitch that have become somewhat 'controversial'. I am NOT trying to stir this controversy/bashing back up. Instead, I'd like to see a good, intelligent di...
Forum Discussion
Stressor wrote:
...you are all calling translation...
Oops, my bad. Technically, translate means to move without rotation, while I was using it as a shortcut word to describe the translation and very slow simultaneous rotation of one end bar with respect to the other. The linkage simply doesn't allow translation or rotation in isolation of each other, so either you get them both or you get neither. Perhaps I should go back and correct all my posts by replacing the word "translate" with "trans-rotate" and footnoting my made-up definition.
Stressor wrote:Actually, the sketch I made in SolidWorks shows that the furthest the rear bar translates with respect to the front bar is when the short side link to that side is perfectly aligned with the front bar, which is right at 15 degrees.
At approximately 30 degrees angular difference between the TV and the TT, the links are fully extended, translated if you will, and continued turning beyond that causes the links to rotate until they run into themselves at about 75 degrees TV/TV angular difference in the real world.
At 29-30 degrees the short link to that same side has continued to rotate to be aligned with the rear bar (the tee of the TT).
At just over 73 degrees, the geometry of the linkage cannot accommodate any further rotation without elongation of the side bars or shortening of the long tee bar or lengthening of the short tee bar.
Tim
