GramProjectsTest VaultAbout

Drag is the mind-killer.

Open source automotive aerodynamics. Improve efficiency, extend range.

Projects
1
Runs
10
Cars
1
Files
2
Cd range, all runs0.2850.307
01

Projects

1 project, 2 phases
P-001 / Release v0.1  /  Released
Latest

Trunk Spoiler v0.1

v0.1 improves downforce at 65 mph versus baseline by 32.2%, or 40.6 Newtons, while maintaining the same measured Cd (.299) as baseline.

Car
Gen. 1 Tesla Model 3
Cd
0.299
Cl
0.073
Files
2 .step
Open release →
All projects, newest first
P-001Model 3 AeroGen. 1 Tesla Model 32 phases
P-001 / Release v0.1Trunk Spoiler v0.1Released1 run2 .stepCd 0.299P-001 / StudyPreliminary CFD: Model 3Published9 runs-Cd 0.285 to 0.307
02

Test Vault

Project
Car

0.2820.2840.2860.2880.2900.2920.2940.2960.2980.3000.3020.3040.3060.3080.310-0.04-0.020.000.020.040.060.080.100.120.140.160.18MODEL 3 CONTROL, Cd 0.299R-005 Large KammbackR-006 Medium KammbackR-004 Commercial Analogue WingR-007 Small KammbackR-009 Bargeboards and Side SkirtsR-001 ControlR-010 Trunk SpoilerR-003 Exaggerated Platform WingR-008 Rear Wheel FairingDRAG COEFFICIENT (Cd) / LEFT = LESS DRAGLIFT COEFFICIENT (Cl)
RunConfigurationProjectCarCdCd vs. controlClForce in Y
R-001Model 3 ControlBaselineP-001 / StudyPreliminary CFD: Model 3Gen. 1 Tesla Model 30.2990.107126 N
R-002Model 3 AI SuggestionsStudyP-001 / StudyPreliminary CFD: Model 3Gen. 1 Tesla Model 3---
R-003Model 3 Exaggerated Platform WingWingP-001 / StudyPreliminary CFD: Model 3Gen. 1 Tesla Model 30.301-0.007-8.44 N
R-004Model 3 Commercial Analogue WingWingP-001 / StudyPreliminary CFD: Model 3Gen. 1 Tesla Model 30.2960.089105 N
R-005Model 3 Large KammbackKammbackP-001 / StudyPreliminary CFD: Model 3Gen. 1 Tesla Model 30.2850.02731.8 N
R-006Model 3 Medium KammbackKammbackP-001 / StudyPreliminary CFD: Model 3Gen. 1 Tesla Model 30.2930.0894.5 N
R-007Model 3 Small KammbackKammbackP-001 / StudyPreliminary CFD: Model 3Gen. 1 Tesla Model 30.2960.087102 N
R-008Model 3 Rear Wheel FairingWheelsP-001 / StudyPreliminary CFD: Model 3Gen. 1 Tesla Model 30.3070.149176 N
R-009Model 3 Front Wheel Bargeboards and Side SkirtsWheelsP-001 / StudyPreliminary CFD: Model 3Gen. 1 Tesla Model 30.2980.112132 N
R-010Trunk Spoiler v0.1SpoilerP-001 / Release v0.1Trunk Spoiler v0.1Gen. 1 Tesla Model 30.2990.07385.4 N

Z is direction of travel, X is side force, Y is parallel to gravity. Directional indicator in lower left corner of video references the wind tunnel and not the object- ignore it.

03

About

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

1.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.

2.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 engineer cars that are mass-market friendly, following Raymond Loewy’s MAYA (Most Advanced Yet Acceptable) principle. On the other hand, individual consumers are free to modify their vehicles to their own personal taste and willingness to push efficiency.