Originally Posted by
Genghis the Engineer
Although, for many aeroplanes at forward CG the stall definition shifts from the classic aerodynamic stall to something more pitch authority limited (the "mush"). Once in that region, the stall speed can go up somewhat more significantly, and this can be hard to predict.
The TB20, being of conventional configuration with fully reversible controls, I'd certainly expect to fall into that category.
G
Yes, of course, concur entirely, the assumed weight method only works if the stall CLmax is the same; if you can't get there for other reasons, it won't work.
Since stall warning is usually also a fixed alpha/fixed wing CL (whether artificial or natural) it should still work for that case; in the kind of cases Genghis mentions, the warning-to-stall speed margin would presumably be rather different at the forward and aft cg cases (with more margin aft than forward, I'd expect)