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Old 06-19-2020, 04:53 PM   #124 (permalink)
aerohead
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testing protocol

Quote:
Originally Posted by JulianEdgar View Post
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.
Please forgive me if this has been covered elsewhere.
It takes 30-miles (48-Km ) of continuous driving at 50-mph ( 80-Km/h ) before all lubricants and dynamic rubber structures reach equilibrium, steady-state conditions.
If all testing follows this pre-test condition, then we're a-okay, as long as all other possible variables are accounted for.
If not, we're introducing number of variables which are not accounted for during measurements, which remain unknown quantities, and are certain to influence measured data and conclusions.
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