HyperCar T.50 & its giant rear fan!

A downforce-generating rear fan is one of the GMA T.50 supercar's most distinguishing features. The fan is a nod to Murray's Brabham BT46B "Fan Car" Formula One car from the 1970s. Murray took advantage of a rule flaw by using a rear-mounted fan to generate a vacuum that sucked the car down onto the track, providing additional downforce without the drag cost of larger spoilers. The configuration was so successful that after only one race, the 1978 Swedish Grand Prix, the Fan Car was removed before it could be banned.

A 48-volt electric motor powers the 15.7-inch carbon-fiber fan, which spins at up to 7,000 rpm and acts on rear spoilers and a rear diffuser. The T.50 comes preinstalled with six settings: Auto, High Downforce, Streamline, Braking, Test, and V-Max Boost. This not only produces more downforce with less drag, but also produces consistent downforce regardless of speed. Speed is dependent on a large rear wing, or the ground-effect bodywork utilized by many F1 teams in the late 1970s. It only works if you move quickly enough. A T.50 driver can easily activate High Downforce mode to gain 50% more downforce. Braking mode can increase downforce while braking, reducing stopping distance by 98 feet from 150 mph.

When not required, streamline mode reduces downforce. By lowering the spoilers and stalling the diffuser, it generates a "virtual longtail" effect, limiting downforce and keeping the T.50 stable during high-speed straight-line runs. Overall drag is reduced by 12.5% as a result. This is because the fan can suck air out from beneath the car more effectively than a diffuser alone. A diffuser can only be so large before air stagnates and vortices form, disrupting downforce.

T.50s Niki Lauda, named after the late quadruple F1 champion, will bypass all fan modes save extreme downforce. The fan will work in tandem with other aerodynamic devices, such as a big rear wing and spinal fin, to generate potentially massive amounts of downforce.