I'd be interested in which approach Andy and others prefer:
1. set the tail incidence down a few degrees to compensate for the lack of downwash (as I have done on the DC-3 and J3 Cub); or
2. add a "downwash" parameter giving an offset for the relative wind over each lifting surface. This will normally be 0 for the wings, of course (I doubt the downwash from canards is enough the change the effective alpha of the main wings, but who knows?).
This problem has little effect on normal flight, but it matters a lot for the landing and takeoff rolls of taildraggers -- without it, they have an unrealistic tendency to nose over.
All the best,
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