Chapter 2 – Thrust and Drag

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Presentation transcript:

Chapter 2 – Thrust and Drag Principles of Flight Chapter 2 – Thrust and Drag

Thrust and Drag To generate lift the wing must travel through the air So we need thrust. But the faster you go the more drag is generated which hinders your progress

Drag To reduce drag an aircraft must be streamlined

Streamlining + Variation of Drag Streamlined shapes should have a fineness ratio of 3-4 to 1 The amount of drag varies with the square of the airspeed 2 x Airspeed = 4 x Drag 3x Airspeed = 9 x Drag

Thrust and Drag in Balance If Thrust is greater than drag aircraft speeds up If Thrust is less than drag aircraft slows down If thrust and drag are equal aircraft’s speed stays constant

Aircraft in Balance If all the forces (Weight, Lift, Drag and Thrust are equal the aircraft will stay level at a constant speed.