Open source automotive aerodynamics. Improve efficiency, extend range.

Drag is the mind-killer.


Preliminary CFD: Model 3

RC/Prototypes

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Aerodynamic optimization is dominated by expensive computational fluid dynamics simulations and labor-intensive wind tunnel sessions. Yet even the most well-constructed simulations aren’t worth much without real-world testing and validation.

Automobile companies- particularly those fielding electric vehicles- are increasingly conscious of the impact of aerodynamic drag on the range of their cars and trucks, but even the most aero-conscious are bound to engineering cars that are mass-market friendly. On the other hand, individual consumers are free to modify their vehicles to their own personal taste and willingness to push efficiency.

Gram’s mission is to design user-manufacturable, open-source, and freely-available aerodynamics modifications for range-sensitive automobiles.

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Model 3 Control

Simulation results from a control run of an unmodified Gen. 1 Tesla Model 3 at 65mph on a rolling road. 

KEY STATS

Frontal Area (m2): 2.259
Planform Area (m2): 8.156
Drag Coefficient (Cd): 0.299
Lift Coefficient (Cl): 0.107

Force in X: 8.32 Newtons
Force in Y: 126 Newtons
Force in Z: -351 Newtons
 Z is direction of travel, X is side force, Y is normal to gravity. Directional indicator in lower left corner of video references the wind tunnel and not the object- ignore it.


Model 3 AI Suggestions

AirShaper- the tool used in all simulations on this page- provides an AI-powered design improvement tool (in beta at time of testing) that offers advice on improving geometry to benefit drag reduction.

Red/burgundy indicates that AirShaper suggests moving the surface outward, while blue indicates that the surface would reduce drag if moved inward.

Simulation results seen here are done on a base/unmodified Gen. 1 Tesla Model 3.

Model 3 Exaggerated Platform Wing

Simulation results from a run of a Gen. 1 Tesla Model 3 with a trunk-mounted platform wing at 65mph on a rolling road.

KEY STATS

Frontal Area (m2): 2.259
Planform Area (m2): 8.389
Drag Coefficient (Cd): 0.301
Lift Coefficient (Cl): -0.007

Force in X: -13.9 Newtons
Force in Y: -8.44 Newtons
Force in Z: -354 Newtons
 Z is direction of travel, X is side force, Y is normal to gravity. Directional indicator in lower left corner of video references the wind tunnel and not the object- ignore it.


Model 3 Commercial Analogue Wing

Simulation results from a run of a Gen. 1 Tesla Model 3 with a trunk-mounted wing that closely resembles what is commonly and commercially available, at 65mph on a rolling road.

KEY STATS

Frontal Area (m2): 2.259
Planform Area (m2): 8.173
Drag Coefficient (Cd): 0.296
Lift Coefficient (Cl): 0.089

Force in X: -14.1 Newtons
Force in Y: 105 Newtons
Force in Z: -347 Newtons
 Z is direction of travel, X is side force, Y is normal to gravity. Directional indicator in lower left corner of video references the wind tunnel and not the object- ignore it.


Model 3 Large Kammback

Simulation results from a run of a Gen. 1 Tesla Model 3 with a large Kammback, at 65mph on a rolling road.

KEY STATS

Frontal Area (m2): 2.259
Planform Area (m2): 8.39
Drag Coefficient (Cd): 0.285
Lift Coefficient (Cl): 0.027

Force in X: -12.4 Newtons
Force in Y: 31.8 Newtons
Force in Z: -335 Newtons
 Z is direction of travel, X is side force, Y is normal to gravity. Directional indicator in lower left corner of video references the wind tunnel and not the object- ignore it.


Model 3 Medium Kammback

Simulation results from a run of a Gen. 1 Tesla Model 3 with a medium Kammback, at 65mph on a rolling road.

KEY STATS

Frontal Area (m2): 2.259
Planform Area (m2): 8.256
Drag Coefficient (Cd): 0.293
Lift Coefficient (Cl): 0.08

Force in X: -8.69 Newtons
Force in Y: 94.5 Newtons
Force in Z: -344 Newtons
 Z is direction of travel, X is side force, Y is normal to gravity. Directional indicator in lower left corner of video references the wind tunnel and not the object- ignore it.


Model 3 Small Kammback

Simulation results from a run of a Gen. 1 Tesla Model 3 with a small Kammback, at 65mph.

KEY STATS

Frontal Area (m2): 2.259
Planform Area (m2): 8.197
Drag Coefficient (Cd): 0.296
Lift Coefficient (Cl): 0.087

Force in X: 4.82 Newtons
Force in Y: 102 Newtons
Force in Z: -348 Newtons
 Z is direction of travel, X is side force, Y is normal to gravity. Directional indicator in lower left corner of video references the wind tunnel and not the object- ignore it.


Model 3 Rear Wheel Fairing

Simulation results from a run of a Gen. 1 Tesla Model 3 with rear wheel fairings, at 65mph on a rolling road.

KEY STATS

Frontal Area (m2): 2.275
Planform Area (m2): 8.164
Drag Coefficient (Cd): 0.307
Lift Coefficient (Cl): 0.149

Force in X: -6.7 Newtons
Force in Y: 176 Newtons
Force in Z: -362 Newtons
 Z is direction of travel, X is side force, Y is normal to gravity. Directional indicator in lower left corner of video references the wind tunnel and not the object- ignore it.


Model 3 Front Wheel Bargeboards and Side Skirts

Simulation results from a run of a Gen. 1 Tesla Model 3 with front wheel bargeboards and side skirts, at 65mph on a rolling road.

KEY STATS

Frontal Area (m2): 2.267
Planform Area (m2): 8.18
Drag Coefficient (Cd): 0.298
Lift Coefficient (Cl): 0.112

Force in X: -27 Newtons
Force in Y: 132 Newtons
Force in Z: -352 Newtons
 Z is direction of travel, X is side force, Y is normal to gravity. Directional indicator in lower left corner of video references the wind tunnel and not the object- ignore it.


Model 3 Front Splitter

Simulation results from a run of a Gen. 1 Tesla Model 3 with a front splitter, at 65mph on a rolling road.

KEY STATS

Frontal Area (m2): 2.266
Planform Area (m2): 8.322
Drag Coefficient (Cd): 0.294
Lift Coefficient (Cl): 0.082

Force in X: -6.52 Newtons
Force in Y: 96.7 Newtons
Force in Z: -346 Newtons
 Z is direction of travel, X is side force, Y is normal to gravity. Directional indicator in lower left corner of video references the wind tunnel and not the object- ignore it.