Home > Aircraft & Aviation > Quizzes > Aerodynamics Practice Test: Helicopter Dynamics
Aerodynamics Practice Test: Helicopter Dynamics
Fast practice, instant feedback. Timer auto-submits when time’s up.
Avg score: 35% Most missed: “For momentum theory analysis, what is rotor modelled as?”
Helicopter Dynamics topics include: Helicopter rotor and its notations, momentum theory, helicopter blades propellers, blade element theory, combined blade element and momentum theory. Helicopter dynamics is a field of aerospace engineering that includes theoretical and practical aspects of helicopter flight.  It includes: Aerodynamics, Stability, Control, Structural dynamics, Vibration, Aeroelastic and aeromechanical stability.  Helicopters have two rotors, the main rotor and the tail rotor. The main rotor blades are attached to the engine and rotate against the surrounding air to produce... Show more
Aerodynamics Practice Test: Helicopter Dynamics
Time left 00:00
25 Questions

1. For forward flight, the airfoil of the blade have fixed stall characteristics.
2. What is the formula for the helix angle?
3. For momentum theory analysis, what is rotor modelled as?
4. Which of these is not an assumption made while formulating momentum theory for hover and clib of a helicopter?
5. Who developed the momentum theory?
6. What kind of motion is produced by the hinged blade which is lying in the plane of rotor disk?
7. Why are twin rotor configuration used?
8. The momentum conservation equation for a helicopter in climb state is independent of which term?
9. Why is blade element theory preferred over momentum theory for designing a propeller?
10. The bound and trailing vortex cancel out each other in the plane of the airscrew blade.
11. What is the relation between the induced velocity in far wake region (w) and that at the rotor disk (v) for hovering condition?
12. Which of these is not the purpose of rotor blade?
13. What is the flap frequency of a gimballed rotor?
14. What is the formula to compute the moment of inertia of the rotor blade about center of rotation?
15. Which of these conditions is essential for a rotor airfoil when the helicopter has high forward speed?
16. Which of these is an important parameter for selecting the rotor blade based on aerodynamic efficiency?
17. Which of these has the lowest disk loading?
18. What is blade lock number?
19. Which of these options is a feature of teetering rotor blade?
20. What would an efficient vertical flight mean?
21. Why does helicopter have huge rotors?
22. What is the blade element theory used for?
23. What is the inflow ratio for hovering?
24. Why is the flap hinge offset in articulated rotor?
25. Which of these is not suitable for helicopter blade?