23-09-2020, 12:26 PM
From a design perspective the steering box is usually moved up relative to the chassis to ensure that the drag link remains more-or-less parallel to the road surface when the car is normally loaded. The greater the angle the drag link makes to the road surface, the greater the 'bump steer' effect will be. When the chassis is dropped a long way, to preserve decent steering geometry, the steering box will need to be raised as the front axle will now be above the chassis. There will be a pause here while lots of users say their drag link goes massively uphill or downhill and they've never noticed any bump steer; to which my reply (from experience) would be you would certainly notice the difference in your car's straight line stability when the bump steer is gone after some redesign work.
To use conventional radius arms, they really need to go back to a single pivot point to work as intended. If there are two joints with any significant distance between them either the radius arms will twist in the axle (pre 1937 axle), or for 1937 onward cars where the radius arm can't rotate, the front axle will function as a massive anti-roll bar, with what is likely to end up as huge oversteer or if the centre of gravity isn't really low, the car wanting to tip over when it's pushed really hard -my experience again.....
To use conventional radius arms, they really need to go back to a single pivot point to work as intended. If there are two joints with any significant distance between them either the radius arms will twist in the axle (pre 1937 axle), or for 1937 onward cars where the radius arm can't rotate, the front axle will function as a massive anti-roll bar, with what is likely to end up as huge oversteer or if the centre of gravity isn't really low, the car wanting to tip over when it's pushed really hard -my experience again.....