F1, don't we love it. Last year we had the double diffuser issue,"is it legal." This year we have Red Bulls suspension.
There are several self levelling suspension systems, most of them use a method of altering the length of the piston damper actuator within the damper unit itself. Under the current FIA regulations these may well be "illegal" or not, who knows. I certainly don't.
There is however another system which uses geometery to achieve the same effect.This system is not new, indeed it was patented in 1935, I think, by Ernest Earles. Widely used by BMW motorcycles, it was very effective in eliminating the forks diving under heavy braking.
"The Earles fork was a variety of leading link fork where the pivot point was aft of the rear of the front wheel — this was the basis of a patent for the design. Designed by Englishman Ernest Earles, this triangulated fork actually caused the front end of a motorcycle to rise when braking hard ".
I realise that RBR is not a motorcycle, but I believe that Adrian Newey, who is undoubtedly the most innovative F1 designer since Colin Chapman, has incorporated this geometery into the RBR6 suspension design.
By careful design of suspension attachment points, and possibly using a cranked suspension damper attachment point, he could reproduce the characteristic of the Earles fork of raising under load, and at the same time, the suspension would still operate normally.
This could then be used to hold the car at it's optimum ride height, irrespective of the fuel load.
The FIA have issued a letter to the teams, which re-iterates the FIA regulations in respect to suspension regulations.This is widely available and have no need to reproduce here.
I will however take one sentence and ask just how do you interpret this?
"The ride height can only be adjusted when the car is not moving."
Taken literally, that means that if the car ride height increases as it would with a convential system, that is also illegal as well.
Newey has, I believe, turned the RBR6 suspension upside down, resulting in it decreasing as the fuel load is consumed. Fanciful, maybe but entirely possible.
It is also possible that the RBR6 has a constant ride height, irrespective of fuel load. Does that equate to self levelling?
There are specific requirements contained in the FIA technical regulations. Provided that the car meets those regulations and the ride height is an entirely mechanical design feature, I fail to see any question of legality.