Eric from the diagram i cant figure how the focusing link works could you show a better diagram---i hope im not the only one , if i am please dont tell anyone thanks ============willie buchta
It's not completely intuitive, the guys who made the one for Sonic Arrow missed the fact that they set it up to be unstable in both trail and roll.
Look at it in plan view (from the top) and trace the angle of the side tie rods. As we push the back of the swing arm left or right, the whole assembly rotates around a virtual pivot point that is where the two arms are pointing in space. The arms should be set up so they point forward of the tire contact patch, the distance between that point and the contact patch is the amount of trail. This should be at least 4" and 5% of wheelbase on vehicles longer than 100" for LSR.
Looking at it from the front, the vertical arms control the amount of roll. If the arms are vertical, the tire will roll like a motorcycle fork. For flat tires on 3 wheel vehicles, this is unstable. Inclining the vertical arms to form a "V" with the focal point at ground level creates zero roll and a slight proverse roll at high steering angles.
Done correctly, there is little load on the arms and lots of load on the shocks.