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aerohead · 03-31-2021, 11:39 AM

I believe that it was 1987, when Colani showed up at Bonneville, with his semi-trailer, full of his creations.
His Utah- 7 was reported @ Cd 0.18.
The tractor-trailer had Cd 0.40 imprinted on the tractor.
Same year, Renault's V.I.R.A.G.E., tractor trailer indicated Cd 0.298 with 700mm of boat-tail.
NASA had published that, without some sort of streamlining structure behind the trailer van, it would be very problematic to see anything below Cd 0.25.
Walter Korff, of Lockheed Aircraft Co., indicated Cd 0.20 for his boat-tailed, 1963 semi-trailer wind tunnel model.

03-31-2021, 11:39 AM	#3753 (permalink)
aerohead Master EcoModder Join Date: Jan 2008 Location: Sanger,Texas,U.S.A. Posts: 16,272 Thanks: 24,394 Thanked 7,363 Times in 4,763 Posts	Luigi Colani I believe that it was 1987, when Colani showed up at Bonneville, with his semi-trailer, full of his creations. His Utah- 7 was reported @ Cd 0.18. The tractor-trailer had Cd 0.40 imprinted on the tractor. Same year, Renault's V.I.R.A.G.E., tractor trailer indicated Cd 0.298 with 700mm of boat-tail. NASA had published that, without some sort of streamlining structure behind the trailer van, it would be very problematic to see anything below Cd 0.25. Walter Korff, of Lockheed Aircraft Co., indicated Cd 0.20 for his boat-tailed, 1963 semi-trailer wind tunnel model. __________________ Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/