![]() This has the effect that the rotordisc orientates itself backwards, slowing the helicopter down. So, what will happen? The advancing blade will flap up and the retreating Into account that the lift distribution is asymmetrical, while theįlap. We can now look again at the helicopter in forward flight, but this time taking In the rotorhead, or by designing rotorblades which are flexible at the root. Is one reason why the blades must be able to flap up and down. The result is a rotordisc which suffers from asymmetrical lift distribution overĪsymmetrical lift distribution along the rotordisc The advancing blade will produce substantially more lift than the retreating one. ![]() Because the lift of a blade depends on the squared relative airspeed, Using the same line of reasoning, the retreating blade will encounter a lower relativeĪirspeed. Relative airspeed because, as a result of rotation, the forward speed must be added to the airspeed. The advancing blade now encounters a higher So, let’s take forward speed into account. Note that we can't speak of an advancing or a retreating As a result, all of the blades in the rotordisc contribute In this scenario,Įach rotor-blade encounters the same airspeed, which is defined by the speed of The rotordisc when the helicopter is in a hover (no forward speed). ![]() The effect of forward speed on the rotors is easily explained.
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