Wing Twist

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  Wing twist is of two types named as geometric twist and aerodynamic twist:- Geometric Twist Different angles of attack at wing root and tip. Wash in Tip chord has a higher angle of attack than that of root chord. Wash out Angle of attack at tip is lower than that at wing root. It is useful in reducing tip vortices. Aerodynamic Twist Difference between zero-lift lines of airfoils at wing root and near the tip. Airfoils at root and near the tip have different zero lift angles of attack.

Static vs Dynamic Stability

 



Is your Aircraft stable? Let's see what defines stability for an aircraft over time.


Stability

Stability is the ability of an aircraft to encounter with the disturbances produced by turbulence, wind gust and flight control inputs to continue with a placid and safe motion. A stable aircraft is said to have equilibrium in flight. The stability of an aircraft is judged on the basis of two phenomena known as static an dynamic stability.


Static Stability 

Static stability is the initial tendency of an aircraft to return to its equilibrium position. Let's say if an aircraft is disturbed by a wind gust and tends to reach its previous equilibrium then, its said to be statically stable.

  

Dynamic Stability

Dynamic stability is the time history of an aircraft's motion after it initially responds to static stability. Being statically stable doesn't guarantee an airplane the dynamic stability because after reacting to the disturbance it might go away from the neutral position as aircraft motion leads to oscillations which dampen over time. 









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