Retreating Blade Stall
Definition
A helicopter flight condition where the retreating rotor blade stalls because the combination of forward speed and blade rotational speed creates insufficient relative wind. Limits the maximum speed of helicopters.
Why Retreating Blade Stall Matters for Pilots
Understanding Retreating Blade Stall is critical for passing the FAA Private Pilot Knowledge Test and performing safely in flight. Aerodynamics questions make up a significant portion of both written exams and oral checkrides. Pilots who grasp concepts like Retreating Blade Stall can make better decisions during all phases of flight, from takeoff to landing.
Exam Tip
This concept is commonly tested in aerodynamics-related questions on FAA and EASA exams. Make sure you can explain Retreating Blade Stall in your own words for the oral exam. Practice applying this concept to real-world scenarios, not just memorizing the definition.
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The angle between the chord line of an airfoil and the relative wind. As AoA inc...
Lift
The aerodynamic force perpendicular to the relative wind generated by an airfoil...
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The aerodynamic force opposing the motion of an aircraft through the air. Drag h...
Parasite Drag
Drag not associated with lift production, including form drag from the aircraft ...