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Summary
DescriptionFAA heli-manual Dissymmetry of lift.PNG
English: Effect of blade airspeed on lift on advancing and retreating side.
Caption: The blade tip speed of this helicopter is approximately 400 knots. If the helicopter is moving forward at 100 knots, the relative windspeed on the advancing side is 400 knots. On the retreating side, it is only 200 knots. This difference in speed causes a dissymmetry of lift.