Found this video where Kenny Brown is explaining his theory on where he wants the front & rear roll centers on an S197. The "we have something coming... that will blow your mind" comment may be about the Mumford link setup.
I believe that video is unlisted, only those in possession of the link can view it. We weren't supposed to share it.The YouTube video is dated March 2021 so I guess that's when he decided to go public with it.
I believe what you're seeing is body roll with the (much) lower roll center of the Mumford link.After the 2:30 mark it looks like a lot of side to side movement in the rear axle. It actually looks unstable to me.
I think I get what your saying but the Cortex video ( post# 20) looks rock solid in regards to lateral movement compared to the Mumford Link video but maybe it's just the camera angle and the way I'm interpreting it.I believe what you're seeing is body roll with the (much) lower roll center of the Mumford link.
With the Panhard & Watts, the RC is about axle height, so when the body rolls around that point, a camera mounted to the body and looking at the diff doesn't see much, if any, lateral movement of the axle, only rotation. But with the RC at ground level, when the body pivots around the RC a camera on the body looking at the diff "sees" the axle moving laterally with the body roll, but it's really the body moving on a different virtual pivot point. It's a frame-of-reference thing.
It does point out that you need to consider the change in body roll-induced lateral movement in relation to the wheels if you're running wide rear wheels/tires and are tight on wheelwell clearance. You might get sidewall rubbing with the Mumford when you didn't with a Panhard or Watts.
I think its still what the other DaveW said, the RC is still setup close to axle height on that Cortex video and certainly not on the KB one.I think I get what your saying but the Cortex video ( post# 20) looks rock solid in regards to lateral movement compared to the Mumford Link video but maybe it's just the camera angle and the way I'm interpreting it.
It’s called a Mumford link.Kenny actually didn't invent it, the basic concept was in an ancient engineering book he came across decades ago and liked the idea and developed it for the s197.