Helicopter Airflow: Why Not Use Control Surfaces Below Rotor?

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SUMMARY

Control surfaces are not utilized below the rotor in helicopters because the rotor blades themselves serve as the primary control surfaces. The lift generated by the rotor is distributed along its entire length, necessitating any potential control surfaces to match the size of the rotors. Additionally, the dynamic nature of rotor blades, which can rise and fall significantly during flight, poses a risk of collision with any control surfaces positioned below, leading to catastrophic outcomes.

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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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