Randall wrote:
RC> Where's the big transonic spike? This shows a transonic maximum
RC> just 22% above the subsonic minimum. Heck, with this flat a curve, I
RC> can just call it 0.2 and have done with it.
RC> -R
In Sutton 7th ed. page 108 you can find a typical diagram of the
variation of drag versus Mach number. For 0� angle of attack Cd is
0.15 up to Ma 0.6 going steeply up from there to a max of 0.42
at Ma 1.2 coming down to 0.25 at Ma 2 and at Ma 5 Cd is back again
at 0.15. At some angle of attack eg. cross wind or steering action,
Cd can go up to much higher values.
PS: As the diagram is from the V-2 missile it should be also present
in the older versions of Sutton.
Hans
http://www.spl.ch
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