I thought i’d Got my head around Peters Ballards explanatory write up on GoMoG. Now thanks to this thread I am not so sure.
The bit I don’t get is that he states the two springs (main spring and rebound spring) are in series so the initial total stiffness is the addition of both spring rates. As I see it, since only one spring is compressed when the axel block is moved by a bump this is not the case? Surely the main spring compression is initially aided by the (partly compressed) rebound spring so it effectively reduces the stiffness of the main spring and “softening” the bump effect?
Difficult to get your head around but although Peter Ballard mentions springs in series, he then explains that Morgan suspension has the compression and rebound springs effectively in parallel when both are in play due to them being above and below stub axle - same deflection, different loads, rates added.
Quote:
So although there is in ‘our’ case one spring above and one spring below the hub, these springs are actually in parallel, not series.Consequently its this pre-load effect that causes an initially higher (rebound + compression) spring rate which then reverts to the lesser compression spring only rate when rebound spring completely unloads.
