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Old 04-06-2013, 05:55 PM   #26 (permalink)
aerohead
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flat plate

Quote:
Originally Posted by California98Civic View Post
Oh, darn. Nevermind. That's what I get for avoiding looking things up and just trying to get relevant info quickly. Sorry. But it is true that a vertical plate will have high drag, no?
Yes,next to a parachute they have about the highest drag.
Hoerner,Fachsenfeld,and Hucho(who uses Hoerner) show around Cd 1.11 for a flat plate.
'Conventional' parachutes are Cd 1.35
A 1906 Buick Model C Touring Car was measured at Cd 1.03 according to Tremulis.The highest drag ever measured for an automobile.
CAR and DRIVER's Don Sherman who did the Crisis Fighter Pinto and Z-Car found that when rear spoilers went above a 30-degree angle(from the horizon)that drag began to grow higher.
The Guerney Flap is vertical,but does not project vertically very far.Maybe an inch for the Ford Torino Talledega of 1969.
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