But the canard configuration efficiency is not much affected by the trim change since both surfaces create lift. this means with a short coupled horizontal tail you have to produce more downward lift (that the wing has to overcome) to remain stable, reducing the efficiency of the combination. When in the ground effects (generally taken as the wing span distance, with diminishing beneficial effects from zero up to the height of the wing span), the pitch trim is affected and you have to trim out the change with the tail, or the canard. On a canard configuration the fore plane makes it stable but both the wing and the canoard produce up force, this is why may feel the canard is more efficient. ![]() On an aircraft with a convetional configuration (horizontal tail in the back), the tail makes it stable by producing a down force. ![]() It is a little more complicated than that.
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