Which phenomenon describes stall near the tip due to dissymmetry of lift?

Which phenomenon describes stall near the tip due to dissymmetry of lift?

• A. Retreating Blade Stall
• B. Advancing Blade Stall
• C. Tip Stall
• D. Induced Stall

Answer: (A)

Dissymmetry of lift in forward flight means the rotor does not produce equal lift on the two halves of the disk—the advancing blade tends to have more lift than the retreating blade. As forward speed increases, the retreating blade’s relative wind is slower, and its angle of attack toward the tip can reach the critical point first. That combination makes the tip region of the retreating blade stall, which is the classic retreating blade stall scenario. The other terms don’t describe this specific situation: stall on the advancing blade is different and not the typical tip-area effect caused by lift dissymmetry; tip stall without tying it to dissymmetry isn’t the same phenomenon; induced stall isn’t the rotor-specific term for this condition.

Dissymmetry of lift in forward flight means the rotor does not produce equal lift on the two halves of the disk—the advancing blade tends to have more lift than the retreating blade. As forward speed increases, the retreating blade’s relative wind is slower, and its angle of attack toward the tip can reach the critical point first. That combination makes the tip region of the retreating blade stall, which is the classic retreating blade stall scenario. The other terms don’t describe this specific situation: stall on the advancing blade is different and not the typical tip-area effect caused by lift dissymmetry; tip stall without tying it to dissymmetry isn’t the same phenomenon; induced stall isn’t the rotor-specific term for this condition.