> Hi Hal,
> 
> Would you elaborate on the error in CDde?  It looks like the same CDde
> used in
> most aeromatic aircraft so if there is an error in the P51d we (still)
> have
> an error in many jsbsim aircraft.
> 
> Thanks,
> Ron

It's probably the situation where if the elevator has a negative deflection,
that is multiplied against the CD and you get a negative drag.

Jon



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