Originally Posted by vdh design
Regarding some comments on the Corally front end.
It's basically a variation of a mcpherson strut assembly in a real car which does away with an upper arm (which most Japanese cars have). And the 12th doesn't need a trailing arm because there are no braking forces going through it.
Are you referring to the standard, red aluminium front end that comes assembled on the Corally SP12X car? If so, then I think you have confused this description for the Associated front end!
A MacPherson strut system has three separate pivot points (one at each end of the moving suspension arm, and one at the end of the fixed arm) whereas a semi-trailing system has only one pivot point - at the opposite end to where the wheel is attached.
The Associated front end (MacPherson design) does have a strut (trailing arm) - it is built into the top link by turning it into a wishbone - in this case it is a tension strut ('leading arm', if you like). The Corally design (semi-trailing) wishbone doesn't need a strut because it can space the ends of its pivot apart to avoid the twisting forces.