A good example of aerodynamic modification testing.
Modification:
Diffuser wing
Intent:
Working with full undertray, change wake pattern to reduce drag
Mock-up:
GOE222 wing extrusion with plywood endplates, attached to rear diffuser with aluminum angle.
Test:
Throttle stop testing, 30 per cent throttle, top speed in km/h, Breadalbane straight, New South Wales, Australia. Weather: 13 degrees C, light head wind, 26/5/20, 8.30am
Results:
No wing - 100
1 finger upper gap - 100
2 finger upper gap - 100.5
3 finger upper gap - 99.5
4 finger upper gap - 100.5
Conclusion:
Makes no difference to drag
Outcome:
Remove mock-up.