We've linked to this before but here's a reminder:
Morgan front suspension in action Obviously we don't know the spec of the springs but it's interesting to see how much time the stub is not touching the rebound spring.
I have a Rover Plus8.
When she is at rest I can rotate the rebound springs without any struggle, indicationg that they are pretty near the point of transition between tension and free.
On jacking the car they compress under the weight/travel of the wheel/hub.
I do not know the poundage of the springs unfortunately.
This tells me that on going over bumps the upper spring does the work.
The rebound spring does the work on depressions/potholes.
Obviously as the wheels change from these two extremes there would be some interaction, the upper spring expanding to push the wheel back towards rest position and vice versa for rebound conditions. Also, the hub will travel past rest position under influence of either spring. Dependant on the magnitude of the bumps/depressions.
Excess downward travel induced by main spring would impinge on rebound spring and vice versa.
A very dynamic scenario.
The video shows real time spring effects on what appear to be reasonable roads where upward movement of the wheels seems the more common. Very interesting!
The predominant spring is the main/upper.
I am not a suspension expert and am only trying to get a handle on the sliding pillar system based on what I see. Hooke's Law? Yes , covered that in Physics. Other influences like mechanics,friction, motion, momentum etc all add to it so it can become complex. Add in tyre and chassis effects......
