1954 Fiat Turbina
 

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?

no way that is .14. .25 i'd believe.

Cd 0.14
 

For a model,I don't have a problem with the number.But if we limit the discussion to model drag coefficients,then the FIAT would be bested by Jaray's Cd 0.13 pumpkin seed of 1921
W.E.Lay's three Cd 0.12 pumpkin seeds of 1933
Taruffi's Cd 0.10 twin-boom 'Tarf' of 1948

I'm with you - for a full size car;)