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What is a trim in aircraft performance?

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in Aircraft Performance by (558k points)
What is a trim in aircraft performance?

(a) The state of equilibrium where the forces and moments are balanced

(b) The state of equilibrium where the forces and moments are not balanced

(c) The state of equilibrium where only the forces are balanced

(d) The state of equilibrium where only the moments are balanced

This question was addressed to me in an interview for internship.

This question is from Cruising Performance in portion Cruising Performance of Aircraft Performance

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Correct option is (a) The state of equilibrium where the forces and moments are balanced

The explanation: Trim is a state of equilibrium where the forces and moments are balanced. In this condition

FN=D

L = W

Where FN is normal force acting on the aircraft, D is drag, L is lift and W is weight.

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