Originally Posted by ford rules
Whats all this stuff even mean can some one kind of explain it? all i got out of it is that your lowers are 43" and uppers are 32" with 10" of seperation?
Well I don't know it all completely, but I'll try and help Beard out here.
The simple fields (the 5 in the upper left) I won't bother with. They should be pretty self explanatory (with maybe the exception of Sprung Mass CG 'Z'. I believe that is simply the Center of Gravity (COG) in the Z plane of the vehicle, meaning it's the height from the ground of the COG. Sprung Mass refers to weight of the vehicle that is supported by the suspension or total weight minus tires and axles). If not, let me know and I'll come back.
Second, what you said is actually incorrect. The X, Y, and Z parameters refer to the 3 dimensional lengths of each link with respect to the truck. So using geometry, you use those 3 lengths to determine the actual length of the links. You can find the length of a 2 sided system using Pythagoris Theorem
x^2 + y^2 + z^2 = Length ^2 (I think, it's been awhile since High School Geometry and Trig).
Or just google 3-link Calculator, and plug those value in and you should see it on the Material Tab in Excel. Nice when someone else does all the math for you.
Anti-Squat, from what I've been able to tell is probably the most important, yet, most hard to explain, part of the whole spreadsheet. It essentially describes how the suspension will load and unload at certain times. From what I've read anywhere from 80%-120% is a decent number for a initial setup, but there is no hard set number because each rig will behave differently because each rig is different. And each rig is used for different terrain. You can research that for hours, but from what I've read, it's best to just set a number and experiment. It's one of the great things about link setups that you can switch them relatively easily to tune them for the best performance.
The Roll-Axis Angle, and Roll Center Height I guess I'm not sure on. I'm assuming the Roll-Axis Angle has to do with forces that are generating Body Roll (what angle that it will be) and the Roll Center Height I believe is the the Height where your COG is. Granted those are both guesses. Maybe Beard or someone who knows more can chime in and correct me (if I'm wrong which is probably the case).