Why Continuous Rotation?
The 401cr has something other simulators don't: A high-quality, one-to-one ratio between vehicle rotation and simulator rotation, without washouts or inverse forces.
Yaw is one of the most critical forces a driver feels on-track. Sure, it helps you feel the car slide, but there's more than that: It tells you where your car is in space and where it's going.
The 401cr gives drivers exactly — and only — what they’re expecting, leaving them free to drive instead of translating the simulator’s cues:
In this right-hand hairpin, the limited rotation simulator runs out of range part-way through the corner, before suddenly starting to move again after the corner exit. The driver feels his car stop turning during the middle of the corner, not turn through the second half of the corner, and then turn to the left while the car is going straight!
The lower the rotation range, the worse the problem is, and feeling something when you should feel nothing is the only thing worse than feeling nothing when you should feel something.
Competing simulators' yaw is almost always less than the +/- 30 degrees shown here. At best, drivers feel scaled down rotation; at worst, they turn one way while the car is turning another.
For example, on a short oval, the car rotates through 360 degrees. The 401cr makes a continuous turn, but during half of the lap, a limited-yaw simulator is turning right while the car is turning left or going straight. And no amount of tricks can compensate.
Some argue that simulator yaw is for slip angle (sometimes simulator makers try to re-brand yaw as a "traction loss" axis). But 1:1 yaw feedback aids significantly in your ability to position the car, even at zero slip angle. You can feel the apex instead of seeing it.
Further, a 1:1 ratio is necessary when dealing with many small steering corrections happening on top of a large, fast rotation.
This isn't something a limited-yaw simulator can handle, but it's absolutely essential to understanding a car at the limit.
And only continuous rotation can do it.