The invisible spoiler was introduced to simulate the immense drag when the prop is set to high RPM on final. It happens only when you fly with very little TQ, below 5-6 depending on the approach speed. Typically with flaps you are above that like TQ 10-12 on final for a 3 degree final drift down angle.   It may also happen when you pull idle on approach without flaps and RPM lever in HIGH position, but that is when operation performing a STOL approach and the additional drag from the p
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