Quote:
Originally Posted by arcosine
I decided to move the spoiler back 6 inches, so I can get the key into the trunk. I'll fill the space with transparent PET sheet that I have left over from my HPV canopy..
Have you ever compared the CD of aircraft and cars? An outstanding car wound have a CD of .2, yet a run of the mill Cessna has CD of .06. The Cessna can fly at 150 mph while getting 18 mpg.
Do you see any big holes for the wheels?:
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It's not fruitful to compare aircraft and automobiles.
Aircraft drag is governed by skin friction.
Automobile drag is governed by longitudinal pressure differentials.
Although I don't have the reference in front of me,I believe Volkswagen's ARVW of 1982 gets similar mpg at similar velocity as the Cessna.