Comparison To The MacPherson Strut
The Chapman strut is often confused with the MacPherson strut, as both use a near-vertical upper strut, The distinction is that the MacPherson strut always requires a lower track control arm where the Chapman uses the drive shaft and a light radius rod.
As it requires a drive shaft, the Chapman strut can only be used at the driven end of the vehicle. For the Lotus designs to which it was applied, this was their rear. MacPherson struts are most commonly used for front suspension and the strut axis forms the kingpin bearing, for steering movement. There is little reason why a Chapman strut could not be used similarly, although there is no record of this being tried on a front-wheel or four-wheel drive car. Both designs are struts, where the strut base is rigidly attached to the hub carrier.
Chapman did use MacPherson struts for the front suspension of the Lotus 17. These were unsuccessful, owing to the stiction problems that Chapman had worked to avoid with the sliding drive shaft joint. A wishbone conversion kit was later developed by ex-Lotus engineer Len Terry.
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