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Stability about roll axis is called _____________(a) lateral stability(b) directional stability(c) longitudinal stability(d) elevator controlThis question was posed to me in a national level competition.The doubt is from Lateral-Directional Static Stability and Control in chapter Stability, Control, and Handling Qualities of Aircraft Design

Answer»

The correct option is (a) lateral stability

The best I can explain: Stability about the rolling is termed as lateral stability. Lateral and directional stability are CLOSELY coupled. When we deflect only aileron it will generate rolling as WELL as it will ALSO cause the AIRCRAFT to yaw. Longitudinal stability is Stability about pitching MOMENT. Elevator is used for such purposes.



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