Trim helps keep the plane "stable" in flight. You may notice that when your plane speeds up the nose starts to rise even when you want it to point at the horizon. When your speed falls the nose will point towards the ground and you don't want that either. Trim sorts this out by making minor adjustments to the planes flight characteristics. Elevator trim will keep the nose centered on the horizon for straight and level flight. You have to adjust trim constantly. A plane that is trimmed is faster and easier to aim with. IL2 on the PC alsos has rudder trim and aileron trim...propitch...fuel mixture...supercharger stages, etc,etc basically more stuff to tinker with.
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