Originally Posted by
UAL T38 Phlyer
Since spanwise flow is at the rear-most part of the wing, and local increase in AOA happens there, it will stall root-first. Since this is the aftmost part of the wing, a stall causes a nose-up pitch...generally the opposite of what you want.
The canard can prevent this by stalling and pitching down before the wing reaches a critical AOA, as in the Rutan designs.