https://www.boldmethod.com/learn-to-fly/aircraft-systems/canards/
Auszug:
It's Not That Simple - Stability And Stalls Get In The Way
If canards were that simple, every aircraft would use them. However, aerodynamics are never that simple. Things get complicated in a stall.
The Canard Must Stall Before The Wing
On a Cessna 172, if the wing stalls before the tail, you'll still have elevator controllability to pitch down. If the tail stalls before the wing, the aircraft will naturally pitch down. In either case, stall recovery is natural.
However, if your aircraft has a canard instead of a tail-mounted horizontal stabilizer, you're in real trouble if the wing stalls first. In this case, the center of gravity would drop the wing and tail, pitching the nose up. The aircraft now enters a deeper stall and becomes unrecoverable.
Stability
Canards can also make an airplane unstable. Simply put, if a wind gust briefly increases the angle of attack on a Cessna 172, the aircraft tends to pitch nose down and return to it's original attitude. In the Cessna's case, the increased angle of attack increases the wing's lift. However, it actually decreases the tail down force, because it decreases the horizontal stabilizer's angle of attack.
However, the canard can actually make your aircraft pitch up further. The increase in angle of attack causes both the canard and the wing to generate more lift. If the canard's increase in lift is greater than the wing's, the nose will pitch further up.
