Page 478 - PPL-engelsk 2025

Principles of flight
And here we do not need to use the elevator

On the other hand, if the

center of gravity is moved,

for example if a person

moves from the front seat
to the back seat, we must

correct for the changed

center of gravity by using

the elevator if we want to continue flying horizontally.

If we do not do this, the machine will become heavier behind the center of

gravity in the above-mentioned case, thereby pitching up the nose and climbing.

To counteract this, we must trim the tailplane or apply downward elevator

deflection.

A prerequisite for horizontal flight at constant speed is:

- that lift is equal to weight

- that thrust is equal to drag

- that the negatively acting moments of thrust and drag are equal to the

positive moment of lift

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5.6 Controls and maneuvering in three axes

An aircraft is controlled using pedals (one right and one left) and a control stick.

Flight Theory PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 478