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Static stability deals with the initial response to a perturbation whilst dynamic stability deals with the behaviour thereafter.

Relate each element to the stability axis it affects.

ailerons

rudder and vertical stabiliser

elevator and horizontal stabiliser

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The horizontal stabiliser helps balance the airplane but not to stabilise it.

A fly-by-wire system allows the use of computers and loop-feedback control in piloting aircraft.

Twin-engine vertical stabilisers are big because...

twin-engined aircraft tend to be less directionally stable

they need to compensate for huge lateral forces due to engine corrotation

they must compensate a huge torque in case of one engine failure.

100%

None of the others is true

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What is the aim of airplane control?

To be able to command the airplane to perform a specific manoeuvre.

100%

To be able to monitor its state.

To be able to fly it stably.

To be able to carry a load.

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A flying wing uses special control surfaces to both balance and stabilise the aircraft.

Dutch roll couples oscillations in yaw and pitch

The centre of lift coincides with the centre of gravity for balanced flight.

Spiral instability is allowed for as long as the diverging period remains long enough for the pilot to respond.

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