Aerodynamics

  • Created by: stonesy71
  • Created on: 06-11-19 11:22

What instruments or systems take information from

 total pressure, pitot pressure and static pressure?

Total pressure can be obtained from a pitot tube and static pressure can be obtained from a static vent the air speed indicator can then take the static pressure from total pressure which will leave dynamic pressure, which can be displayed on the air speed indicator.

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Why must you not select undercarriage of flaps dow

·         Having the undercarriage down would cause drag that the aircraft is not stressed to take.

·         The aircraft is not design to take the extra load caused by having the flaps down undercarriage.

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Passive lateral stability can be achieved by

Dihedral, Swept wings, high mounted wings; explain how each works...?

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Passive lateral stability is the interaction between the aircraft in roll and the airflow with no control surface movement.

·         Dihedral – enables passive lateral stability which needs slide slip, lower wing has better angle of attack that the higher wing and provides stability.

·         Swept wings – same as dihedral

·         High Mounted – only works at the wing root better than low pushes the right way.

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What are the detrimental effects of transonic flig

causes them?

  • 1.       Large increase in drag
  • 2.       Reduce Lift
  • 3.       Buffeting
  • 4.       Pitching – movement of shockwaves
  • 5.       Shock stall
  • 6.       Increased separation due to span wise flow
  • 7.       Control ineffectiveness
  • 8.       Instability
  • 9.       Kinetic Heating
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When flying for maximum range what things must be

into account.??

Maximum range is the largest distance covered in miles, endurance is the longest time covered in Hours. Factors that affect maximum range are;

-Lift to drag ratio

-Weight difference between start and end of flight

-Specific fuel consumption

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What would you do to a variable pitch propeller if

 shut an engine down in flight and why?

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feather to not cause drag and not to rotate. Rotating or wind-milling can cause the engine to restart.

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Draw a diagram showing the location of vortex

generators on and aircraft and explain why they are used?

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Vortex generators are used to re-energise the boundary layer which delay separation by converting the boundary layer from laminar to turbulent flow.

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State the definition of load factor and explain wh

the load increases when an aircraft is in a banked turn at a constant height.?

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Load factor n is the aircraft lift divided by the weight (ratio of lift to weight) as an aircraft has to produce more lift to oppose weight in a turn due to the lift now acting on angle to weight and not in vertical opposition, the load factor increases.

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Explain two problems that could occur if a high li

 not operate correctly.?

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The take-off distance and landing speed increased, reduced manoeuvrability, stall speed

increased, un-commanded manoeuvres, structural damage.

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Name the 3 axis of rotation of an aircraft, the mo

about each axis and the conventional controls which would cause their movement.?

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-Lateral axis(Pitch)

-Longitudinal axis(Roll)

-Directional axis(Yaw)

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Explain an aerodynamic and structural advantage of

 an elliptical or tapered wing compared to a rectangular wing.?

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An aerodynamic benefit of using an elliptical or tapered wing is that they produce less induced drag and a structural benefit is that the wing root bending moment is reduced.

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Explain what will happen to the centre of lift as

transits through the transonic region and state what the pilot may have to do to keep the aircraft level.?

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The centre of lift moves rearward from approx ¼ chord to ½ chord which causes a nose down movement so the pilot will have to move the control column rearward causing the elevator to move upwards.

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