Hi Pete,
The movement you see in the video is not body roll. BlueTiger, (like virtually all commercial racing and flight simulators) uses gravity to simulate the forces of acceleration, braking, and centrifugal force. The platform tips back to simulate acceleration, forward for braking, and left or right for centrifugal force.
The driver, all controls, and the monitors all move as a unit. Essentially the driver always sees the controls and his view of the monitor stay stationary in the same relative location (see picture). The driver’s attention is focused on the race track in the monitors. He sees the right turn coming up and makes the appropriate control and steering inputs. His body feels the sled tip to the left on a right hand turn. He may feel gravity but he interprets it as centrifugal force because that is consistent and matches what he sees and the control inputs he made. The driver’s natural tendency to interpret the movement forces so they are consistent with all the other strong and stable stimulus cues in the simulation is called immersion. Force Dynamics, an excellent company mentioned in this thread, also has a good explanation of how motion simulators use gravity to created the impression of acceleration, braking, and centrifugal force. After racing for only a few minutes, most drivers become unaware of how much the simulator is actually moving and just feel the acceleration forces acting on the car. In the video, BlueTiger is moving over a full 40 degree range.
For racing in particular it is important for the driver to be able to feel centrifugal force increase, reach a peak, and then decrease as the car sweeps through a turn. It is also important that the force felt by the driver is instantaneously consistent and accurately proportionate to correlate with cornering, acceleration, and braking dynamics. We believe strongly correlated proportional movement and feedback are of prime importance but we also provide the “impulse style” engine vibration, road texture, and abrupt changes in direction cues, etc. In essence, impulse style movements are a subset of the motion capability of BlueTiger.
The concept and degree of “immersion” provided by simulators is the key factor of authenticity. With BlueTiger, the driver has the option to proportionally add or subtract dynamic forces, physical position relative to horizontal, and impulse style movements as desired. The crux is to duplicate the feel of a specific car at speed, not just make the motion “car-like”. BlueTiger provides clear and unambiguous settings for the driver so that these adjustments can systematically be made. (sorry for the long answer but I think I am still in trade show mode.)