*A SAE,75th-Anniversary, "Springboard" article, by Norman Chew,Executive Vice President, Freightliner Corp.,1980 SAE paper shared one of the NASA images and a drag breakdown for the mods.
*I've 'colorized' the schematic to better segregate the mods.
*The base truck was around Cd 0.717.
*After NASA got through with it,it was around Cd 0.289.
*Wind-averaged drag reduction was 67%.
*Zero-wind drag reduction was 59,6%.
*NASA's tests were duplicated in Freightliner's wind tunnel (Daimler-Benz's FKFS tunnel,Stuttgart,Germany),and they essentially found agreement with NASA's numbers.
At zero-yaw ........................................... wind averaged
*Nose = delta 4.8%.................................. 7%
*Cab roof spoiler 15.7%............................. 9%
*Gap = 19.7%......................................... 17%
*Side skirts 8.7%..................................... 19%
*Belly pan 5.9%....................................... 5%
*Boat tail 4.8%........................................ 10%
