Originally Posted by wagonman72
Sweep won't shorten the wheelbase under compression but kickup will, but only very little given the cars don't have much travel.
you're right, i was thinking backwards
sweep makes the tires move forwards
visualize the arc that the arm moves on. no kickup/sweep means that arc is perpendicular to the centerline of the chassis. kickup rotates that arc around the middle point of the hingepin, so now when viewed from the side the arc is angle towards the back of the car. with sweep the arc gets rotated so that when viewed from the top the arc is at an angle.
with sweep the arm moves forward as it travels upward. a super easy way to visualize this, is to use your hands. make a knife edge with your hands and rest them on that edge on a table or something. rest them at various angles (to simultate different amounts of sweep and/or kickup) and rock them onto your fingers, you can see how your palm not only moves up and down but forward and back
sorry for the brain fart earlier, i was in a hurry