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Aerohead, thanks ! I think you are referring into Figure 14, on page 10 in the SAE 810185 (Fig, 14 - Influence of rear end slope inclination angle on drag coefficient).
My vehicle (pickup truck) has L0 / L -ratio of 0.3441 (without a tail extension) and L0 / L of 0.4087 (with the tail extension) as of today. For L0, I use trucks bed length (without and with the tail extension).
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I've done a linear interpolation between the 27% aft-body and 36% aft-body, tested and reported in Figure 4.59.
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So you interpolated that range, tested it and results fall into the interpolated line, correct?
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