David Megginson <[EMAIL PROTECTED]> said:

> Curtis L. Olson writes:
> 
>  > YASim airplanes start flying really crappy if you try to go inverted.
>  > If you don't believe me, just try taking the 747 on 100' AGL inverted
>  > pass over SFO. :-)
> 
> Curt's joking, of course, but it's worth noting that any aircraft with
> positive dihedral is going to be brutally unstable in the roll axis
> when inverted -- that's why aerobatic planes don't tend to have
> dihedral.

Ah yes.  No dihedral on the A-4, either.

Best,

Jim

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