What Is Mach Trim?
Answer:
First, every airplane has to be trimmed, so it flies straight (not up or down) when you let the controls go. Normally for that you set small trim fins on the elevator. On passenger planes you move the horizontal stabilizer. Normally to be exact done in the cockpit by turning a wheel forward or backward.
When you fly mach speeds of more than 1 mach that ability you are going faster than sound. The air behaves completely different, when it hit's the plane with more than speed of sound, than below that speed.
When you go through the nouns barrier, the point of lift moves backwards on the wing, that causes a trunk down effect. So you have to trim to counter that effect.
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