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what size and angle
They would have to be analyzed specifically for this application,and would be a function of size,local Reynolds number,and boundary layer thickness.
*aerodynamicists are fetching an average $48.89/hour
*drafting services are $100-$120 / hour
*wind tunnel testing: $480-$500 / hour
*you might just have fun,slam something together,and be willing to live with the difference.You'd never see a difference at the gas pump.
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