Fiat Turbina - Wikipedia, the free encyclopedia
"The Turbina held the record for lowest drag coefficient on an automobile (0.14) for 30 years.[1]"
Turbine Speed with Style | Hemmings Motor News
"That its drag would be low was suggested by tests of a one-fifth-size model in the Turin Polytechnic's tunnel that showed a drag coefficient of only Cd=0.14."
I didn't find the statement Wikipedia cited.
Is the Cd of 0.14 believable? How does the Turbina achieve it?