Quote:
Originally Posted by dcb
re: pushrod suspension, you are adding sprung weight though, in the form of a pushrod and a bellcrank. AFAIKT it does allow a progressive "spring rate" without progressive springs (as do other non-pushrod/rocker geometries), but still it is extra weight between the spring and the road and thus "sprung weight", just like a pushrod engine needs the pushrods and rockers to be moved by the valve springs half the time.
Unless spring tension increases non-linearly (and dramatically) with weight, I don't see the "reduce unsprung" weight argument as valid, not yet anyway.
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If done right then it shouldn't add to the weight, or at least I thought that was the idea ? Apologies, o/t but I would like to know, so I drew this :
A = spring / damper unit,
B, C = upper and lower joint. the upper joint extends to form the top of the rocker
D = the wheel
The "unsprung" part should be everything outboard of B and C, and the top of the rocker - between B and the top of the damper / spring.
The other advantage in open wheel cars is to reduce the "stuff" sitting in the airflow - as in F1 / Indy Car.
Apologies if I am mistaken, I am keen to learn...
