Multiple video feeds allow the viewing of the groundboard, test vehicle and fans. The included angle between the sides of each passage is approximately 6 degrees. The air is turned at the four corners of each passage by guide vanes. These vanes are of the curved-airfoil type formed by two intersecting arcs with a rounded nose. The arcs were carefully chosen to give a practically constant area through the vanes.
Ample space is available under the groundboard for running power cables and air supply lines.
Four 120V receptacles are located on each side of the ground plane. The test section groundboard is being progressively reconfigured to support the special needs of automotive aerodynamic and acoustic test applications. The current capability is detailed in sections below. The trapeze balance provides accurate measurements of total vehicle drag, plus downforce at each wheel. The vehicle is supported on four small tire contact plates, separated from the surrounding non-metric groundboard.