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Something in that series of "buses" doesn't add up.
.88 Cd to .36 by just rounding the front? That doesn't agree with other known Cd's I've seen (NASA and others).
I think the claims of an Airstream being about 30% better than a "normal" trailer are probably close, some from a better Cd, and some from a smaller frontal area. Which is also in the same ballpark as one of the NASA studies where they rounded the front of a boxtruck. 30% better than .88 is .62, way off .36.
Which is all just speculation. No real wind tunnel tests = no real number. Seems like there isn't one out there.
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