Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you continue browsing the site, you agree to the use of cookies on this website. See our User Agreement and Privacy Policy.

Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you continue browsing the site, you agree to the use of cookies on this website. See our Privacy Policy and User Agreement for details.

Successfully reported this slideshow.

Like this presentation? Why not share!

- Basic Aerodynamics.Ppt by azfa 84611 views
- Principles of flight_chapter_6 by Skelmersdale Squa... 1047 views
- Principles of flight by MikeSantos Lousath 1359 views
- Principles of flight_chapter_4 by Skelmersdale Squa... 599 views
- Principles of flight_chapter_1 by Skelmersdale Squa... 733 views
- Principles of flight_chapter_2 by Skelmersdale Squa... 660 views

1,455 views

Published on

constant speed propeller aircraft

No Downloads

Total views

1,455

On SlideShare

0

From Embeds

0

Number of Embeds

1

Shares

0

Downloads

67

Comments

0

Likes

2

No embeds

No notes for slide

- 1. Uncontrolled copy not subject to amendment <ul><li>Principles of Flight </li></ul>
- 2. Principles of Flight <ul><li>Learning Outcome 5: </li></ul><ul><li>Be able to apply the principles of flight and control to rotary wing aircraft </li></ul><ul><li>Part 1 </li></ul>
- 3. REVISION
- 4. Questions <ul><li>Name the Forces Acting on a Glider in Normal Flight. </li></ul><ul><li>a. Force, Weight and Lift. </li></ul><ul><li>b. Drag, Weight and Thrust. </li></ul><ul><li>Drag, Weight and Lift. </li></ul><ul><li>Drag, Thrust and Lift. </li></ul>
- 5. Questions <ul><li>How does a Glider Pilot Increase the Airspeed? </li></ul><ul><li>a. Operate the Airbrakes. </li></ul><ul><li>b. Lower the Nose by pushing the Stick Forward. </li></ul><ul><li>Raise the Nose by pulling the Stick Back. </li></ul><ul><li>Lower the Nose by pulling the Stick Back. </li></ul>
- 6. Questions <ul><li>A Viking Glider descends from 1640 ft (0.5 km). </li></ul><ul><li>How far over the ground does it Travel (in still air)? </li></ul><ul><li>a. 17.5 kms. </li></ul><ul><li>b. 35 kms. </li></ul><ul><li>70 kms. </li></ul><ul><li>8.75 kms. </li></ul>
- 7. Questions <ul><li>When flying into a Headwind, the distance covered </li></ul><ul><li>over the ground will: </li></ul><ul><li>a. Be the same. </li></ul><ul><li>b. Decrease. </li></ul><ul><li>Increase. </li></ul><ul><li>No change. </li></ul>
- 8. Propellers <ul><li>Objectives: </li></ul><ul><li>Define Blade Angle and Blade Angle of Attack. </li></ul><ul><li>Show with the aid of a diagram the Aerodynamic </li></ul><ul><li>Forces acting on a Propeller Blade in flight. </li></ul><ul><li>Explain Aerodynamic and Centrifugal Twisting </li></ul><ul><li>Moments acting on a propeller. </li></ul><ul><li>4. Explain the effect of changing forward speed on: </li></ul><ul><li>a. A Fixed Pitch propeller. </li></ul><ul><li>b. A Variable Pitch propeller. </li></ul><ul><li>(and thus the advantages of a variable pitch propeller). </li></ul><ul><li>5. Explain the factors causing swings on take-off for: </li></ul><ul><li>a. A Nose-Wheel aircraft. </li></ul><ul><li>b. A Tail- Wheel aircraft. </li></ul>
- 9. Propellers MOD
- 10. Propellers (Terminology)
- 11. Propellers (Terminology) Airflow due to Rotational Velocity
- 12. Propellers (Terminology) Induced Flow Airflow due to Rotational Velocity
- 13. Propellers (Terminology) Induced Flow Airflow due to Rotational Velocity Relative Airflow
- 14. Propellers (Terminology) Induced Flow Airflow due to Rotational Velocity Relative Airflow Chord Line
- 15. Propellers (Terminology) Induced Flow Airflow due to Rotational Velocity Relative Airflow = AofA Chord Line
- 16. Propellers (Terminology) Induced Flow Airflow due to Rotational Velocity Relative Airflow = AofA = Blade Angle Chord Line
- 17. Total Inflow Propellers Blade Twist Rotational Velocity Approx 4 o Angle of Attack
- 18. Effect of Airspeed Induced Flow Airflow due to Rotational Velocity At Zero Airspeed
- 19. Effect of Airspeed Induced Flow Airflow due to Rotational Velocity (Same) At a Forward Airspeed = Total Inflow TAS + -
- 20. Effect of Airspeed Induced Flow Airflow due to Rotational Velocity (Same) = Total Inflow TAS + - At a Forward Airspeed Need larger for same
- 21. Effect of Airspeed _ _ _ _ 100% 75% 50% 25% True Airspeed Propeller Efficiency at Max Power Fine Coarse
- 22. Pitch of Propeller Blade _ _ _ _ 100% 75% 50% 25% True Airspeed Fine Coarse Propeller Efficiency at Max Power Variable Pitch
- 23. Why a different Number of Blades?
- 24. Aerodynamic Forces Total Inflow Airflow due to Rotational Velocity RAF
- 25. Aerodynamic Forces Total Inflow Airflow due to Rotational Velocity RAF Total Reaction
- 26. Aerodynamic Forces Total Inflow Airflow due to Rotational Velocity RAF Lift Drag Total Reaction
- 27. Aerodynamic Forces Total Inflow Airflow due to Rotational Velocity RAF Total Reaction Thrust
- 28. Aerodynamic Forces Total Inflow Airflow due to Rotational Velocity RAF Total Reaction Thrust Prop Rotational Drag
- 29. Aerodynamic Forces (Effect of High Speed) TAS+Induced Flow Airflow due to Rotational Velocity RAF Total Reaction Thrust Slow Speed Fixed Pitch
- 30. TAS+Induced Flow Airflow due to Rotational Velocity RAF Total Reaction Thrust High Speed Fixed Pitch Aerodynamic Forces (Effect of High Speed)
- 31. TAS+Induced Flow Airflow due to Rotational Velocity RAF Total Reaction Thrust High Speed Fixed Pitch Aerodynamic Forces (Effect of High Speed)
- 32. TAS+Induced Flow Airflow due to Rotational Velocity RAF Total Reaction Thrust High Speed Fixed Pitch Aerodynamic Forces (Effect of High Speed)
- 33. TAS+Induced Flow Airflow due to Rotational Velocity RAF NB: Rotational Drag reduced, RPM ? Thrust High Speed Fixed Pitch Aerodynamic Forces (Effect of High Speed)
- 34. TAS+Induced Flow Airflow due to Rotational Velocity RAF NB: Rotational Drag reduced, RPM increases. Don’t exceed limits. Thrust High Speed Fixed Pitch Aerodynamic Forces (Effect of High Speed)
- 35. TAS+Induced Flow Airflow due to Rotational Velocity RAF Total Reaction Thrust Slow Speed Variable Pitch Aerodynamic Forces (Effect of High Speed)
- 36. Faster TAS+Induced Flow Airflow due to Rotational Velocity RAF Total Reaction Thrust (eventually reduces) High Speed Variable Pitch (same or possibly greater) Aerodynamic Forces (Effect of High Speed)
- 37. Windmilling Propeller Negative TAS Airflow due to Rotational Velocity
- 38. Windmilling Propeller Negative TAS Airflow due to Rotational Velocity TR
- 39. Windmilling Propeller Negative TAS Airflow due to Rotational Velocity TR Negative Thrust (Drag)
- 40. Windmilling Propeller Negative TAS Airflow due to Rotational Velocity TR Negative Thrust (Drag) Negative Rotational Drag (Driving The Propeller)
- 41. Windmilling Propeller Negative TAS Airflow due to Rotational Velocity TR Negative Thrust (Drag) Negative Rotational Drag (Driving The Propeller) This may cause further damage, even Fire.
- 42. Feathered Propeller Note that in Firefly/Tutor prop goes to “Fine Pitch” if engine rotating, “Coarse Pitch” if engine seized Although twisted, in aggregate, blade at “Zero Lift α ”. Therefore drag at minimum.
- 43. Take-Off Swings All Aircraft: Torque Reaction means greater rolling resistance on one wheel Helical slipstream acts more on one side of the fin than the other
- 44. Take-Off Swings
- 45. Take-Off Swings Tail wheel aircraft only: Asymmetric blade effect Gyroscopic effect
- 46. Take-Off Swings
- 47. Take-Off Swings Affect all aircraft on rotate?
- 48. Take-Off Swings All Aircraft: Don’t forget crosswind effect!
- 49. Centrifugal Twisting Moment Tries to fine blade off
- 50. Aerodynamic Twisting Moment Tries to coarsen blade up Relative Airflow Total Reaction
- 51. Aerodynamic Twisting Moment Windmilling Tries to fine blade off Relative Airflow Total Reaction
- 52. ANY QUESTIONS?
- 53. Propellers <ul><li>Objectives: </li></ul><ul><li>Define Blade Angle and Blade Angle of Attack. </li></ul><ul><li>Show with the aid of a diagram the Aerodynamic </li></ul><ul><li>Forces acting on a Propeller Blade in flight. </li></ul><ul><li>Explain Aerodynamic and Centrifugal Twisting </li></ul><ul><li>Moments acting on a propeller. </li></ul><ul><li>4. Explain the effect of changing forward speed on: </li></ul><ul><li>a. A Fixed Pitch propeller. </li></ul><ul><li>b. A Variable Pitch propeller. </li></ul><ul><li>(and thus the advantages of a variable pitch propeller). </li></ul><ul><li>5. Explain the factors causing swings on take-off for: </li></ul><ul><li>a. A Nose-Wheel aircraft. </li></ul><ul><li>b. A Tail- Wheel aircraft. </li></ul>
- 55. Questions <ul><li>Blade Angle of Attack is between? </li></ul><ul><li>a. The Chord and Relative Airflow. </li></ul><ul><li>b. The Rotational Velocity and the Relative Airflow. </li></ul><ul><li>The Total Reaction and the Chord. </li></ul><ul><li>Lift and Drag. </li></ul>
- 56. Questions <ul><li>Increasing speed with a fixed pitch propeller will? </li></ul><ul><li>a. Be more efficient. </li></ul><ul><li>b. Reduce efficiency. </li></ul><ul><li>Make no difference. </li></ul><ul><li>Increase the Engine speed. </li></ul>
- 57. Questions <ul><li>The Forces trying to alter the Propeller Blade </li></ul><ul><li>Angle of Attack are? </li></ul><ul><li>a. ATM and CTM. </li></ul><ul><li>b. CDM and ATM. </li></ul><ul><li>CTM and REV. </li></ul><ul><li>AOA and ATM. </li></ul>
- 58. Questions <ul><li>The Resultant Forces that a Propeller produce are? </li></ul><ul><li>a. Lift and Thrust. </li></ul><ul><li>Thrust and Propeller Rotational Drag. </li></ul><ul><li>Drag and Total Reaction. </li></ul><ul><li>d. Drag and Thrust. </li></ul>

No public clipboards found for this slide

Be the first to comment