Quote:
Originally Posted by Shepherd777
Hey Phil -
Thanks for the kind words.
On the new StarShip, we actually obtained 0.19 Cd or below for the first 71 feet of the 76 foot long rig. And now we know how to fix the area at the rear of the trailer that was causing that spike up to 0.28 Cd. So I'm hopeful that we can get it down just into the teens. A 0.19 Cd is our dream goal for a drag coefficient number, and that is what we are working towards.
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In NASA's paper on big-rig aero they make mention of a publication by the Rocky Mountain Institute in which the lower limit expected for a semi-tractor rig would be Cd 0.13.
I'm not going to pay for RMI's report,so I have no idea where that quanta was sourced from,or if RMI did there own evaluation.
Walter Korff of Lockheed considered Cd 0.20 doable in 1963.Here's his idea
