Originally Posted by downwardspiral
D=?
WS= 2.42 ft= 0.825 m
H= .42 ft (from base of spoiler to center of spoiler) =0.143 m
AoA= 16º
ρ=~1.204 kg/m^3
V=80 mi/hr = 129 km/hr = 35.8 m/s
D= 1/2 [(0.825 m)(0.143m )(0.279 radians)] (.09) (1.204 kg/m^3) (35.8 m/s)^2
I got 135 N = ~30 lbs
A got a similar figure but never posted as I didn't have the actual dimensions of the spoiler at hand so used alot of assumptions.