Roll Steer, Roll Axis and Roll Center and How They're Related

[The WidowMaker]

i have a few questions for rrc, ra, and roll steer.

first, how in a c4l is roll axis related to roll steer. ive put my propeller hat on, but its not spinning. ive heard that the rear roll axis is related to the roll steer, but my assumption was that the angle of the lca determined roll steer and nothing else. and since the uca in a c4l determines the roll axis (??? see below), the ra can be changed without touching the lca's. the only way roll steer can exist is if one bar is shorter or longer than the other. this creates toe in on one wheel and toe out on the other which steers the rear. but, if they are level at ride height and a turn is entered, one bar moves up and one moves down an equal amount (this must be where my error is) and therefore the angles cancel each other out.

next question; rear roll axis is used to calculate the rear roll center, but the whole cars roll axis is drawn through the front and rear roll centers, correct?

what points are used to calculate rear roll axis on a c4l? my reading tells me its the convergence of the fronts of the rlca for one pt, but the information goes extinct from there. is it the uca housing mount? the convergence of the uca's in the trunk area? and if its either, how would it be any different? if i drew a pt from the ic through the uca housing mount, i would still end up at the convergence of the uca's, wouldnt i? now is the roll center a point vertical to the axle centerline, or is it that area in the trunk?

thanks for your help, its late and im going to bed now, cause my wife says!!!!

Tim