4 AERODYNAMICS
4.1 GENERAL NOTES
Drag [SCx]: total drag (including wheels) of the car resolved to the tire contact point.
Downforce [SCz]: total downforce generated by the car.
Front downforce: downforce acting at the front contact patches.
Rear downforce: downforce acting at the rear contact patches.
Balance %F: percentage of the total downforce acting at the front contact patches.
E = L/D: vehicle efficiency
All dimensions are full scale.
Aerodynamic loading is a function of atmospheric conditions:
• 5°C increase in ambient temperature from ISA conditions result in a 2.7% reduction in aerodynamic
forces.
• 10 mbar increase in air pressure from ISA conditions results in a 1% increase in aerodynamic forces.
• 50% increase in humidity from ISA conditions results in a 0.3% reduction in aerodynamic loading.
4.2 AERODYNAMIC SENSITIVITY
4.2.1 Aerodynamic maps datum point:
Front Ride Height (FRH) is the distance between the ground and a point intersection of the Reference Plane
(5mm above the lower surface of the skid block when new, plane between the skid block and the wooden
plank) with a plane orthogonal to both the Reference Plane and the car symmetry plane passing on the
Front Wheel Centre Line.
Rear Ride Height (RRH) is the distance between the ground and a point intersection of the Reference Plane
(5mm above the lower surface of the skid block when new, plane between the skid block and the wooden
plank) with a plane orthogonal to both the Reference Plane and the car symmetry plane passing on the
Rear Wheel Centre Line.
At the datum point aerodynamic coefficients will be:
= 100%
= 100%
% =
= 40%
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