Quote:
Originally Posted by Fourbtgait
I agree that the smaller trailer with slight modifications would be more aereodynamic.
But smaller is not always practical for some people in a situation.
Hence my question of a methodology/formula for establishing the loss of or increase of aereodynamics for a given frontal area.
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Hucho offered a drag table from D.M.Waters' research,presented in Proceedings of the 1st Symposium on Road Vehicle Aerodynamics,London,1969,Paper 4.
*Waters shows the drag of a flat-faced trailer,tow vehicle combination with Cd 0.82.
*By softening all the leading edges of the trailer face,the composite drag coefficient drops to a minimum when the radius used is equal to 0.39% of the square-root of the frontal area,achieving Cd 0.546.
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If you had a topper on the Tacoma that possessed a height and width equal to the height and width of the radii origins,the trailer would basically train behind the Toyota,and the radii would get the flow over the difference.
This would make for nice drafting.
