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ibosley, Master's Degree
Category: Engineering
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Experience:  Mechanical Engineering
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Figure included in web address below shows that, as a consequence

Resolved Question:

Figure included in web address below shows that, as a consequence of changes in an aircraft’s flight conditions (e.g. velocity, angle of attack etc.), the line of action of the lift force is no longer coincident with the centre of mass of the aeroplane. Instead, it is shifted forwards by a distance of dL.

1. Explain the result of this change on the stability of the aeroplane. Write down the change in the magnitude of the moment of force.

2. With the help of a sketch, explain how the stability of the aeroplane can be reinstated. Write down the balanced moment equation.

http://i1169.photobucket.com/albums/r503/weemanjoe/airplane.jpg
Submitted: 1 year ago.
Category: Engineering
Expert:  ibosley replied 1 year ago.
1. The change of position of the lift force will induce a moment equal to FL*dL in the clockwise direction. This will cause the aircraft to nose up.

2. Stability can be reintroduced by inducing a moment equal and opposite of that induced by the life force. However, for the value of the question I cannot submit a drawing.
ibosley, Master's Degree
Category: Engineering
Satisfied Customers: 93
Experience: Mechanical Engineering

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