As a long time scale modeler I add that a 'warbird' is any aircraft that served the military of any country and not defined by it's performance or dificulty in flying. Some non-warbirds are tougher to fly than the so called traditional warbirds. AT-6s. T-34s and t-28s are just as much a warbird as a P-51 (and let's not forget that a Beech model 17 Staggerwing and a version of the venerable Cub are warbirds too.)

As to how scale a plane has to be to be called a warbird - that's a good question since many ARF warbird versions would be laughed out of a scale meet, yet are still fun and in the spirit of a given plane.But the whole point here is that many excellent non-conventional 'trainers' are out there and can be diferent from the high wing box fuse look-alikes.

quint (ex N5RQ)