Abstract: A selectable compatibility electrical connector assembly has a high performance jack and a high performance plug for mating with the jack to form a high performance electrical connection. The jack is adapted to receive low performance plugs and has a movable member therein for altering the transmission loss characteristic of the connector by introducing or removing circuit elements into or from the connector circuit depending upon whether a low performance plug or the high performance plug is inserted in the jack. The plug is adapted to be inserted into a low performance jack and has a movable member therein for altering the transmission loss characteristic of the connector by introducing or removing circuit elements into or from the connector circuit depending upon whether the plug is inserted into or removed from a low performance jack.

Abstract: A blowing system for controlling the aerodynamics of a ground vehicle comprises a source of compressed air, a valve for regulating the flow of the compressed air, and a plenum for discharging the air at a rear portion of the vehicle. The air discharged through the plenum prevents flow separation and consequently reduces the drag on the vehicle. It may also increase lift, reducing effective weight and thus rolling resistance of the tires, or decrease lift to improve tire traction and handling. The blowing system may have separate plenums for the left and right sides of the vehicle whereby vortex roll-up and flow separation which occur on only one side of the vehicle may be eliminated. Asymmetrical blowing of only one plenum will produce rolling and yawing moments to restore the vehicle's lateral/directional stability when exposed to a side wind.