Left uncorrected, this creates a massive lift imbalance, causing the helicopter to roll violently. Leishman explains how this is resolved via . Modern rotors use mechanical hinges or flexible composites that allow blades to flap up and down freely. The advancing blade flaps upward, reducing its effective angle of attack and lift. The retreating blade flaps downward, increasing its angle of attack and lift, thereby equalizing the forces across the rotor disk. Compressibility and Stall Limits
If you need help exploring specific topics within Leishman's work, let me know if you would like to: Step through a mathematical Left uncorrected, this creates a massive lift imbalance,
Leishman demonstrates how combining BET with Momentum Theory allows designers to calculate the non-uniform "induced inflow" across the disk, yielding highly accurate predictions for rotor performance. 4. Aerodynamics of Forward Flight The advancing blade flaps upward, reducing its effective