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Old 02-24-2011, 06:23 PM   #128 (permalink)
aerohead
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Quote:
Originally Posted by MGB=MPG View Post
interesting ,, air foils
do not air foils have design speed ,
what is design speed on image 1
airfoils are wings . wings produce lift , at some speed and wind condition would they not fly off the road?

lot of a NACA 0015 foil, generated from formula




Plot of a NACA 2312 foil, generated from formula
MGB,at some given airspeed,anything will be airborne.
The Template is designed for zero separation and continuous static pressure regain the further you go back down the tail.
Remember,a spoiler is designed to re-attach separated flow onto the car body to spoil lift.The Template produces no separation,no lift.
It's funny that you show the 1957 MG EX-181 LSR streamliner.This car IS one of the 'Template-cars',which goes out to 80% of the original Template.It does embody reflex-camber and over-shoots the template,however,at Cd 0.12,you see the value of the aft-body streamlining.
-------------------------------------------------------------------------- Since the late 1970s lift is not really a stability issue for 'everyday' road velocities.Dr.Alberto Morelli's work at Pininfarina figured to how to design for zero-lift.It's not a problem for those looking at mpg savings.
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