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Space to organize the design process for MS16.

This table includes any notable iterations made on the aerobody as well as the results given by CFD sims. (Naming conventions are arbitrary)

All CFD sims are ran with air velocity at 20 m/s.

Version

Description/Changes

Notes

Dimensions (LWH) (m)

Cd

CdA

Drag Force (N)

MSXV

(for reference)

Wide body (so that other subsystems would 100% fit)

Rounded nose

Curved bottom and top profiles

image-20241028-220949.png

4.95 x 1.85 x 1.17 m

Frontal Area

1.35m^2

0.11

0.1485

17.73

V15 (Liam)

Straight top/bottom profiles

Rounded nose

~About 5.75 m^2 for solar array

image-20241028-183500.png

Wheelbase length & max steering angle most likely will not comply with ASC 2026 regs (currently 2m and 12 degrees, will need to be around 2.4m and 15 degrees) for a 5.5m car.

  • Need to make aero wider if this is the case, as we do not want dynamic wheel covers opening on small turns.

Need to increase length to accommodate solar

5.5 x 1.35 x 1.13 m

Frontal Area 0.98 m^2

0.13

0.1274

15.30

V16 (Liam)

Straight top/bottom profiles

More aggressive, slightly pointed nose

~5.25 m^2 for solar array

image-20241028-183555.png

Not enough room for solar, reduction in Cd and FA is minimal.

Smaller frontal area = larger protruding canopy = more drag

  • To avoid this, canopy needs to be as long as possible (L/h ratio should be around 5-6)

5.5 x 1.29 x 1.13 m

Frontal Area

0.96 m^2

0.125

0.12

14.30

V17 (Liam)

Rounded top/bottom profiles

Less aggressive nose

~5.25 m^2 for solar array

Canopy comes to a point at the back instead of an edge

image-20241028-222207.png

Still will need more room for solar, was just experimenting with changing the top/bottom profile shape

5.5 x 1.35 x 1.13 m

Frontal Area

1.02 m^2

0.117

0.119

14.32

V18 (Liam)

Rounded top/bottom profiles

~5.25 m^2 for solar array

Canopy comes to an edge at the back (less flow separation)

image-20241029-021321.png

Not achieving significant enough reduction in Cd. Things to try:

  • Making taper near the tail less aggressive (we still want to include the taper to save weight however there is too much flow separation atm.)

  • Larger fillet between roof and canopy

  • Longer canopy

5.5 x 1.35 x 1.17 m

Frontal Area

1.05 m^2

0.116

0.122

14.52

V19 (Liam)

Proof of concept for drag reducing alterations

~5.10m^2 for solar array

Longer canopy, removed taper at back (almost)

image-20241031-214759.png

5.5 x 1.35 x 1.17 m

Frontal Area

1.05 m^2

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