Helicopter Aerodynamics Review 100% Verified
Dissymmetry of Lift - ANSWER Compensated by hinging rotor blades to flap up and
down
Advancing Blade - ANSWER Blade that flaps up, reducing angle of attack and lift
Retreating Blade - ANSWER Blade that flaps down, increasing angle of attack and lift
Rotor Blade Speed - ANSWER Equal tips speed when hovering
Torque - ANSWER Engine-driven rotor spin causing opposite fuselage rotation
Tail Rotors - ANSWER Energy-intensive, complex, fragile, safety hazard
Notar - ANSWER Helicopter lateral lift without tail rotor using Coanda effect
Coanda Effect - ANSWER Fluid tendency to attach to convex surfaces
Retreating Blade Stall - ANSWER Blade tip stall due to high speed and angle of attack
Ground Effect - ANSWER Hovering close to ground reduces power needs
Gyroscopic Precession - ANSWER Force input on spinning object output occurs 90
degrees later
Dissymmetry of Lift - ANSWER Compensated by hinging rotor blades to flap up and
down
Advancing Blade - ANSWER Blade that flaps up, reducing angle of attack and lift
Retreating Blade - ANSWER Blade that flaps down, increasing angle of attack and lift
Rotor Blade Speed - ANSWER Equal tips speed when hovering
Torque - ANSWER Engine-driven rotor spin causing opposite fuselage rotation
Tail Rotors - ANSWER Energy-intensive, complex, fragile, safety hazard
Notar - ANSWER Helicopter lateral lift without tail rotor using Coanda effect
Coanda Effect - ANSWER Fluid tendency to attach to convex surfaces
Retreating Blade Stall - ANSWER Blade tip stall due to high speed and angle of attack
Ground Effect - ANSWER Hovering close to ground reduces power needs
Gyroscopic Precession - ANSWER Force input on spinning object output occurs 90
degrees later
