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Canards

Canards. Why? Pusher arrangement: balancing a pusher with a conventional layout is very difficult and often impossible (ex. Wright Flyer, Curtis XP-55, Kyushu J7W1). Wright Flyer. Curtiss XP-55 Ascender. Kyushu J7W1 Shinden. Canards. Why?

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Canards

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  1. Canards Why? • Pusher arrangement: balancing a pusher with a conventional layout is very difficult and often impossible (ex. Wright Flyer, Curtis XP-55, Kyushu J7W1).

  2. Wright Flyer

  3. Curtiss XP-55 Ascender

  4. Kyushu J7W1 Shinden

  5. Canards Why? • Stable pitch break @ stall of the canard provided the canard is designed to stall before the wing (ex.Rutan Varieze, Beech Starship). Note the strakes in both ac, designed to: • Provide fuel volume close to the empty cg • Delay wing stall Starship also features variable sweep canard to trim negative PM of wing flaps.

  6. Rutan Varieze

  7. Beech Starship

  8. Canards Why? • In conventional tail-aft configurations the tail lifts down for trim. In canard configurations the canard lifts up for trim. • Items 2 & 3 combined give lower D and higher trimmed L. • Longitudinal control surfaces are in front of the wing out of its downwash and never in its wake. • Change of pitch attitude is more direct and therefore faster w. a canard. This is very desirable for highly maneuverable ac.

  9. X-29

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