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Moti and company were a little secretive about the DRS system, but they did tell us that they had the wing CFD checked at various angles of attack to come up with the optimal DRS on and off positions.
The DRS actuators integrated nicely into the carbon-skinned hollowed out wing mounts. The secret units are the stepper motors or high pressure compressed air and pneumatic cylinders that power the wing are hidden in the truck area.
In early testing, the DRS system was good for six mph on Willow Spring's front straight and 3 mph down the front straight at Buttonwillow! When the car ran at the last Global Time Attack Superlap Battle for a shakedown, the DRS system was not yet installed and would have probably made a pretty big difference in lap time!
When the wing is in the low drag position it still makes 12% of its original downforce while shedding 60% of this overall drag.
In speedster trim, the car has a lot less frontal area and a lot less drag. The roll cage tubes do make some turbulence and will be faired in sometime later. Creampuff had faired cage tubing.
2 comments
What did they do with the other 1% of the weight? 52.5+46.5 only equals 99%
We lightened the car so much that we managed to get it under 100% weight, this car only had 99%!