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Aerodynamics

Table of Contents.

6.1 to 6.2 Helicopter Aerodynamics

6.1 Learn Quiz

Match each of the following terms with an appropriate definition:

  1. Aerofoil
  2. Chord
  3. Span
  4. Camber
6.2 Learn Quiz

Recall the aerodynamic properties of a rotor blade in respect to:

  1. Aerofoil shape
  2. Blade twist
  3. Blade taper

6.3 Bernoulli's Theorem

6.3 Learn Quiz

Recall the relationship between dynamics pressure, static pressure and total pressure in a streamlined flow of an ideal fluid and state how pressure alters in a venturi.

6.4 General Helicopter Aerodynamics

6.4 Learn Quiz

Match each of the following terms with an appropriate definition:

  1. Rotor thrust
  2. Rotor drag
  3. Total reaction
  4. Relative airflow
  5. Rotational airflow
  6. Induced airflow
  7. Centrifugal reaction
  8. Rotor disc
  9. Coning angle

6.5 to 6.7 Hovering Flight

6.5 Learn Quiz

Label a diagram showing the vectors acting on a rotor blade in hovering flight.

6.6 Learn Quiz

Match each of the following items with an appropriate definition:

  1. Ground effect
  2. Tail rotor drift
  3. Rotor shaft tilt effect
  4. Re-circulation
6.7 Learn Quiz

Select from a list the statement which best describes:

  1. Vortex ring state (settling with power)
  2. Loss of tail rotor effectiveness (LTE)
  3. The conditions leading thereto
  4. The appropriate recovery action

6.8 Rotor Blade Movement

6.8 Learn Quiz

Match each of the following terms with an appropriate statement:

  1. Feathering
  2. Flapping
  3. Flapping to equality
  4. Dragging
  5. Advance angle
  6. Phase lag

6.9 to 6.10 Forward Flight

6.9 Learn Quiz

Match each of the following terms with an appropriate definition:

  1. Dissymmetry of lift
  2. Flapback
  3. Cyclic limits
  4. Airflow reversal
  5. Retreating blade stall
  6. Compressibility
  7. Inflow roll
  8. Translational lift
6.10 Learn Quiz

Label a diagram showing the vectors acting on various sections of a rotor blade in forward flight.

6.11 to 6.13 Power Requirements

6.11 Learn Quiz

Match each of the following terms with an appropriate definition:

  1. Rotor profile drag
  2. Induced drag
  3. Parasite drag
6.12 Learn Quiz

Recall the power available and power required curves and best speeds for range and endurance, best rate of climb and best angle of climb.

6.13 Learn Quiz

Select from a list the statement which best describes:

  1. Over-pitching
  2. The conditions leading to
  3. The appropriate recovery action

6.14 to 6.17 Autorotative Flight

6.14 Learn Quiz

Match each of the following terms with an appropriate definition:

  1. Autorotative force
  2. Autorotative section
6.15 Learn Quiz

Select from a list the statement which best describes the effect on autorotative flight of variations in:

  1. All-Up-Weight (AUW)
  2. Density altitude
  3. Airspeed
  4. Rotor RPM.
6.16 Learn Quiz

Label a diagram showing the vectors acting on a rotor blade section during forward autorotative flight.

6.17 Learn Quiz

Label a diagram showing the vectors acting on a rotor blade section during an autorotative flare.

6.18 Other Conditions

6.18 Learn Quiz

Select from a list the statement which best describes:

  1. Ground resonance
  2. Mast bumping
  3. Dynamic roll-over
  4. The condition leading thereto
  5. The appropriate recovery action