Uncontrolled copy not subject to amendment. Principles of Flight
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1 Uncontrolled copy not subject to amendment Principles of Flight
2 Principles of Flight Learning Outcome 2: Understand how the stability of an aeroplane is maintained in flight and how manoeuvrability is controlled Part 1
3 Principles of Flight H Copter B Loons A Ship A Bourne R Way C Tower S Huttle Dan Winterland I Flyum Revision
4 Questions What is the force called that drives an aircraft forwards? Lift Weight Drag Thrust
5 Questions What is the force called that resists the forward motion of an aircraft? Lift Weight Drag Thrust
6 Questions If your speed is doubled, by how much would the Drag be increased? x2 x4 x6 x8
7 Questions If Thrust = Drag and Lift = Weight then the aircraft is: Climbing Flying Straight & Level and Accelerating Flying Straight & Level an Decelerating Flying Straight & Level at Constant Speed
8 Stability Objectives: 1. Identify the Axes of Rotation for an Aircraft. 2. Identify the Planes of Movement for an Aircraft. 3. Describe and Explain Stability in the 3 Planes of Movement. 4. Explain Dihedral and Anhedral and how they affect Stability.
9 OW!! Stability What would happen to this dart when thrown? What would happen now? Something is needed to Stabilise the Dart (Aircraft).
10 Stability Airflow Centre of Gravity (CG) Airflow Body Ahead of CG is Destabilising. Body Behind CG is Stabilising.
11 Basic Stability Stable Unstable
12 Basic Stability Stable Forms of stability Static - initial reaction Dynamic - subsequent reaction
13 Basic Stability Stable Forms of stability Static - initial reaction Dynamic - subsequent reaction
14 Basic Stability Stable Forms of stability Static - initial reaction Dynamic - subsequent reaction
15 Basic Stability Stable Forms of stability Static - initial reaction Dynamic - subsequent reaction
16 Basic Stability Stable Forms of stability Static - initial reaction Dynamic - subsequent reaction
17 Application to Aircraft Static Stability Unstable Neutral Stable
18 Application to Aircraft Statically Stable Dynamic Stability Dynamically Neutral Dynamically Unstable Dynamically Stable
19 Planes of Stabilisation Pitch (Longitudinal) Yaw (Directional) Longitudinal Axis Roll (Lateral) Lateral Axis Normal Axis
20 Stabilisation Axis Plane Stability Longitudinal Rolling Lateral
21 Stability
22 Stabilisation Axis Plane Stability Longitudinal Rolling Lateral Lateral Pitching Longitudinal
23 Stability
24 Stabilisation Axis Plane Stability Longitudinal Rolling Lateral Lateral Pitching Longitudinal Normal Yawing Directional
25 Stability
26
27 Directional Stability
28 Directional Stability Flight Path CG Lift Stabilising Influence of fin: 1. Value of Lift 2. Moment Arm Enhancement features: A large fin Something and/or a long causes moment the aircraft arm to yaw
29 CofG Considerations
30 The strange case of the ever growing fins
31
32 Longitudinal Stability
33 Longitudinal Stability Lift Flight Path Weight
34 Longitudinal Stability Lift Lift Flight Path Weight
35 Lateral Stability
36 Lateral Stability Lift Resultant Sideslip
37 Lateral Stability Hdg Aircraft sideslips in this direction
38 Lateral Stability Methods Large Fin of high aspect ratio (a big tall fin). Lift from fin rolls wings level
39 Lateral Stability Methods hedral: Due to new direction of relative airflow r wing has higher AoA than upper - more lift - tends ll wings level. Lift
40 Lateral Stability Methods 3. Sweepback Span Chord Aspect Ratio More Less Higher Less More Lower Lift More Less LOW WING
41 Lateral Stability Methods 4. High wing Less Lift More Lift low near wing roots affected selage - Increases AoA on
42 Lateral Stability Methods 1. High Fin. 2. Dihedral. 3. Sweepback. 4. High Mounted Wing ut too much Lateral Stability High wing and Sweepback) ery undesirable in fighter aircraft. Therefore anhedral to reduce the excess
43 Any Questions?
44 Stability jectives: Identify the Axes of Rotation for an Aircraft. Identify the Planes of Movement for an Aircraft. Describe and Explain Stability in the 3 Planes of Movement. Explain Dihedral and Anhedral and how they affect Stability.
45 Questions at are the 3 planes of an aircraft s movement? Pitching, Lateral and Rolling. Pitching, Rolling and Yawing. Yawing, Longitudinal and Rolling.
46 Questions ich one of the following will REDUCE Lateral Stability? edral. arge Fin. eepback.
47 Questions at are the 3 Axes about which an Aircraft can move? Pitching, Lateral and Longitudinal. Pitching, Rolling and Yawing. Yawing, Longitudinal and Normal.
48 Questions ich 3 Terms describe Static Stability? Stable, Neutral and Unstable. Stable, Rolling and Unstable. Yawing, Neutral and Stable.
49
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