The vehicle was mounted on a
sub-frame with hydraulic rams so that it can be
tilted front to back and side to side by up to 30 degrees. The suspension unit
of each wheel was replaced by a hydraulic ram so that they can be individually
manipulated, and each wheel is driven by its own electric motor. These
photographs show the stand before the camouflage was added to hide the
The hydraulic power packs were mounted in the engine compartment, and the four variable speed motor drives and other control electronics were mounted in the boot.
Each wheel could be driven individually, so as to simulate wheel spin and
skidding etc. The suspension units for each wheel were manipulated to simulate
various terrain conditions; from wallowing through mud to cobble stones.
All the motions were controlled by a real-time process control computer which was programmed to synchronise all the motions with a video film which illustrated the manoeuvrability of the vehicle and simulated features such as traction control and anti-lock braking systems.
The control computer executed a high level multitasking language; each task being allocated to a particular motion, with synchronisation markers to keep each in sequence.
This degree of control proved invaluable, as the video was being continuously edited by the exhibition design team right up until the last few hours before the press preview day.