Page Comparison

MSXV

(for reference)

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

Rounded nose

Curved bottom and top profiles

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

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

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

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)

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 V22 (Liam)

Proof of concept for drag reducing alterations

~5.10m^2 for solar array

Longer canopy, removed taper at back (almost)

Image Removed

CFD inconclusive

5.5 Old canopy style, similar to MSXV

Image Added

Old canopy style, similar to MSXV

Roof starts separating from main body right away, allowing more space for solar array (roof not big enough)

5.5 x 1.35 x 1.17 m

Frontal Area

1.01 m^2

0.13

0.13

15.78

V23 (Liam)

Much wider roof compared to V22, allowing more space for solar

very small frontal area, might be too small and not leave enough room for other subsystems

Image Added

• Could only fit 5.6m^2 of 125mm x 125mm solar cells on this roof, will have to make it larger in the next iteration.

• The junction between the body and the roof may be too aggressive in this model; will attempt to make the transition smoother

5.7 x 1.35 x 1.17 m

Frontal Area

10.05 m^2945 m^2

0.15

0.142

16.98