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Looking at photo u provided. The radius arms are in silver paint and the side shafts in blue paint coming out from gearbox. What happens in bump is wheels go up and wheel moves in an arch. The gearbox pivot point is 100 mm from centre of gearbox either side of centre line. The suspension does not move that much total travel of single shock/spring is about 35 mm.
Her they are in 3D
X Y Z
-14.96 3.05 11.22 frame end
0 20.87 11.22 gearbox end
0 26.37 11.22 side shaft wheel end(outer)
0 4.00 11.22 gear box end (inner end)
Hope this helps
Picture is perfect. My car is based on that rear suspension. Yes it has to be in 3D. What i am trying to achieve is to be able to know what the suspension is doing through its arch. The rear wheels more through an arch as any VW Beetles rear suspension does. Also how the suspension angles change and whether the wheels go in on bump or out on bump. It helps me to set wheel alignment correctly based purely on exact measurements.
Thanks for reply. Each point of suspension will have an xyz. X is center of car out to rear or front. Y is from centre out to wheel of each side and Z is height each joint is from ground.
Using the same graph if u entered (4.00,0.00),(26.00,0.00),(20.00,0.00) that would be side shaft from gearbox to center of wheel. The radius arm attaches at (20.00,0.00) which is third lot of numbers here in brackets.
If u load the following coordinates into Interactive Cartesian Coordinates in Maths is Fun u will get an idea of radius arm attachment.
(3.05,-14.96),(4.00,0.00),(20.00,0.00) that does not account for side shaft from gearbox to wheel.
Side shaft would be (4.00,0.00),(26.00,0.00) it attaches at 4 inches form centreline of gearbox at zero to 26 inches also at zero but a high from ground at 11.22 (Z)
Thanks Bob for replying. X = -14.96 Y = 3.05 Z = 11.22 radius rod attachment to rear of frame
X = 0 Y = 20.87 = 11.22 radius rod attachment to side shaft tube from gearbox
X = 0 Y = 26.37 = 11.22 side shaft tube at wheel end
X = 0 Y = 4.00 = 11.22 side shaft tube at gearbox end
These measurements are in inches as the Q basic program i have been trying is in imperial. But it is for a McPherson strut suspension. Does not give the correct results. Google Adam Aero Formula Vee u will see how rear suspension works. Very simple design. Using VW Beetle gearbox basically.
Hello all. First time here. I have a single seater Formula Vee racing car and need help to write a simple program to work out movement of rear suspension. I have limited knowledge of Trigonometry or algebra. Can someone please give me a few pointers to how i can go about this. Rear suspension is basically a triangle fixed at two points moving in an arch. Thank your all. Can provide more information later and maybe sum examples i did in Open Office Spreadsheet.
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