Why put the tailplane in front of the wing?
Firstly, in order to confer vital pitch stability, the foreplane must be set at a higher angle of incidence compared to the main-plane.
In other words it is at a slightly more nose-up angle.
One result is that the foreplane will stall before the main wing.
The foreplane having stalled, losing lift, the glider pitches nose-down (a characteristic of any stable aircraft), thereby preventing the main wing ever from stalling.
Therefore a canard hang glider is, in principle, virtually stall proof. In practice there are a number of drawbacks to the canard configuration, not least of which is complexity.
And there is one phase of flight when stalling the main wing helps greatly; the landing flare.
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