Overall Results

This is a summary of all the CFD "virtual wind tunnel" simulations performed on a Kyosho Mini-Z MR03 Mazda 787b simplified 3D model.

Several different rear wing configurations were tested: no wing, flat rear wing, 15, 30, 45 and 60 degree rear wing, broken wing, gurney flap, and scoop wing.

The table below shows drag and down forces for all the different rear wing configurations tested:

Drag (gf)
Down Force (gf)
No Rear Wing
6.2
- 7.8 (lift)
Broken Wing
6.4
- 3.8 (lift)
0o Rear Wing
6.6
- 0.5 (lift)
15o Rear Wing
7.7
4.6
Gurney Flap
7.2
5.7
30o Rear Wing
8.9
8.0
45o Rear Wing
10.1
8.5
60o Rear Wing
10.6
9.3
Scoop Wing
11.7
13.5

A chart showing these results, and the trade off between drag and down forces, is available here.

All values above consider the car "racing" at 10 m/s (36 km/h). Charts showing the results for other speeds (2.5, 5.0, 7.5 in addition to 10 m/s) are available here.

Detailed results and pictures for each of the simulations are posted in the following links:

Virtual Wind Tunnel: 60 Degree Rear Wing
Virtual Wind Tunnel: Scoop Wing

Streamlines, pictures showing the theoretical trajectory of particles flowing around the car are posted here (colored according to pressure coefficient - Cp) and here (colored by air speed).

Videos of vertical plane streamlines, "3D" streamlines and particle tracks are also available.

 All results come from a computer simulation of a Kyosho Mini-Z MR03 3D model, resembling a Mazda 787b car body. None of the results have been validated empirically at a real wind tunnel, so all the typical CFD caveats apply.

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