A hundred-foot circle averages out the crosswinds.
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So for example, a rear hatch extension does not start with an angle determined by The Template. It starts with the angle horizontal and then inclines it downwards, with flow separation and drag being measured at the different angles.
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It drives me nuts when people say '
angle' when they mean '
tangent' but I don't burn what little social capital I have trying to get people to change.