Tailless Aircraft - Aerodynamics - Pitch Control

Pitch Control

Many early designs failed to provide effective pitch control to compensate for the missing stabiliser. As a result, these aircraft could pitch up or down sharply and uncontrollably if they were not carefully handled. These gave tailless designs a reputation for instability. The original Dunne biplanes and the later success of the tailless delta configuration show that the problem was due as much to inadequate design as to any problem inherent in the tailless configuration.

The solution usually adopted is to provide large elevator and/or elevon surfaces on the wing trailing edge. These must generate large control forces, as their distance from the aerodynamic center is small and the moments less. Thus a tailless type may experience higher drag during manoeuvres than its conventional equivalent.

Read more about this topic:  Tailless Aircraft, Aerodynamics

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