First of all, my hypothesis was disproved. I
hypothesized that the inverted airfoil spoiler with endplates would have
the lowest elapsed time. It was really the flat plate spoiler at 15°.
I think this was because the endplates produce
more lift, but end up causing too much drag.
Possible sources of error for my experiment
could have been that the speeds from the wind tunnel were not exact.
Another thing was that I am not the best woodworker, so my wings could have
been slightly off.
Possible applications for my experiment would be
at a real drag race.