Thanks for pointing this out Patrick. I didn't see it that way...John. You are completely backwards in your thinking on this. Lowering the seat into the frame absolutely increases the performance of the rig. What you are claiming is assuming the 3dof system is there to provide lateral g force sensations which it does not. It provides sensations of chassis movement.
I know you haven't done this, I would advise you to try it for yourself before you make such claims. Smoother motion is better motion. The higher the CG is from roll center just makes it harder for the actuators to deliver smooth motion.
Ask me how I know, pic for reference.
If John is looking for more roll angle, then he is right, being higher he will have more roll or angular movement than being at center. Just like being on a teeter-totter and being further out from the pivot center.
But using degrees of roll to simulate sustained G-forces (Centrifugal forces) is a futile attempt.
- The angle of the roll will never match lateral forces
- You will never have more than 1G theoretical roll, and even that is at 90-deg to earth
- You will always have to roll in and out of the fake G-force effect, which is unnatural and why we don't to such effects. Although there are many other companies that do in the space.
In real life, keeping the mass closer to the vehicle center helps with changes of direction. This is the same for motion systems. It's much easier for the motor to change direction and accelerate from the center, then it is when its extended. We have even recently found this to be true with a real Sprint car that a customer installed our motion on. An extreme example, but the top wing on and off, made the car feel different, like it would in real life. Inertia is not favorable for change of direction.
Hope that makes sense, its always a tradeoff.
As a wild example, if you could get indefinitely closer to the pivot center, then would you ultimately not feel anything at all?