Helicopter Airflow: Why Not Use Control Surfaces Below Rotor?

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Control surfaces are not used below helicopter rotors because the rotors themselves function as the primary control surfaces. The lift generated by the rotor spans its entire length, necessitating any potential control surfaces to be as large as the rotors themselves. Additionally, rotor blades experience significant dynamic movement during flight, which could lead to collisions with any control surfaces positioned below. Such collisions would result in catastrophic failures. Therefore, the design of helicopters relies solely on the rotor blades for control.
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Why control surfaces are not used below rotor in helicopters?
 
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vishnu2315 said:
Why control surfaces are not used below rotor in helicopters?
Because the rotors are the control surfaces.
 
vishnu2315 said:
Why control surfaces are not used below rotor in helicopters?
Because the lift on the rotor moves over the full length of the rotor so the control surfaces would need to be as big as the rotors. Rotor blades are dynamic in flight, they can rise and fall significantly. The rotor blades would collide with the control surfaces with catastrophic results.
 

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