EASA PART-66 MODULE 8.3 : THEORY OF FLIGHT
- 1. 8.3 THEORY OF FLIGHT www.part66.blogspot.com
- 2. FORCES ACTING ON AIRCRAFT IN THRUST FLIGHT • The aircraft’s propelling force LIFT • Arranged symmetrically to the Acts at right angle to the line of centre line flight & through the Centre of • Act parallel to the line of flight Pressure of the wings DRAG • Opposes the forward motion WEIGHT@ GRAVITY • Regarded as a rearward acting Acts vertically downwards through force the Centre of Gravity FORCES ACTING ON AIRCRAFT IN FLIGHT
- 3. FORCES ACTING ON AIRCRAFT IN FLIGHT • An aircraft flying at constant height and speed LIFT = WEIGHT THRUST = DRAG • Under these condition i. Angle of attack altered to adjust the production of lift exactly equals the weight which it must support ii. Engine thrust set to exactly equal the aircraft drag generated at that particular speed FORCES ACTING ON AIRCRAFT IN FLIGHT
- 4. Arrangement of forces • Lift = Weight and Thrust = Drag Aircraft tend to rotate nose up or nose down if the forces line of action not correctly arranged Proper arrangement of the forces (depends on aircraft design) i. Centre of pressure aft of centre of gravity nose down ii. Thrust line below drag line nose up FORCES ACTING ON AIRCRAFT IN FLIGHT
- 5. Arrangement of forces LIFT WEIGHT LIFT and WEIGHT = nose down couple FORCES ACTING ON AIRCRAFT IN FLIGHT
- 6. Arrangement of forces THRUST and DRAG = nose up couple DRAG THRUST FORCES ACTING ON AIRCRAFT IN FLIGHT
- 7. Arrangement of forces THRUST and DRAG = nose up couple LIFT DRAG THRUST WEIGHT LIFT and WEIGHT = nose down couple FORCES ACTING ON AIRCRAFT IN FLIGHT
- 8. GLIDE • Condition aircraft with no thrust from engine • Glide ratio distance covered to hight lost • Highest Lift/Drag ratio give maximun distance by flying with minimunm drag
- 9. FLIGHT ENVELOPE • Load factor is ratio of aircraft lift to its weight • Flight envelope discribe aerodynamic and structural limitation of aircraft • Pilot fly the aircraft based on the envelope