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Aero Engineering 315

Aero Engineering 315. Lesson 27 Gliding and Climbing Flight. Lesson Objectives. Write Equations of Motion for power-off glide Calculate glide angle, glide range, sink rate, velocity for min sink and velocity for max glide range given T-38 charts or a drag polar

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Aero Engineering 315

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  1. Aero Engineering 315 Lesson 27Gliding and Climbing Flight

  2. Lesson Objectives • Write Equations of Motion for power-off glide • Calculate glide angle, glide range, sink rate, velocity for min sink and velocity for max glide range given T-38 charts or a drag polar • Know points where min sink and max glide range occur • State situations appropriate to fly at above speeds • Write Equations of Motion for steady climb • Calculate climb angle, ROC, Max AOC, and Max ROC given T-38 chart or drag polar • Know points where max AOC and ROC occur • Find the velocities for max AOC and ROC • State situations appropriate to fly at above speeds • Define absolute, service and combat ceilings

  3. When Max Excess Thrust = 0

  4. Climbs and glides summary Gliding Flight • Glide angle • Glide range • Sink rate Climbing Flight • Climb angle • Climb rate • Ceilings Results in just six separate parameters to determine

  5. T-38 Example Given: W = 8,000 lbs h = 10,000 ft Find: RMAX

  6. T-38 Example Given: W = 8,000 lbs h = 10,000 ft Find: RODMIN

  7. T-37 drag polar example • CD = 0.02 + 0.057 CL2 • S = 184 ft2 • W = 6,000 lbs • Hr = sea level • Find • (L/D)max • PRmin

  8. T-38 Example Given: W = 12,000 lbs h = Sea Level Find: gMAX

  9. T-38 Example Given: W = 12,000 lbs h = Sea Level Find: ROCMAX

  10. T-38 Ceiling What happens to TA - TR as we go higher?

  11. Ceilings Based on maximum climb rates • Absolute Ceiling = 0 ft/min ROC • Service Ceiling = 100 ft/min ROC • Cruise Ceiling = 300 ft/min ROC • Combat Ceiling = 500 ft/min ROC

  12. Performance Summary(text p. 173) *for typical non-afterburning turbojet aircraft

  13. Performance Summary Climbing Cruise Glides

  14. Next Lesson (T28)… • Prior to class • Read text 5.9.1-5.9.2, 5.9.5-5.9.7 • Complete homework problems #31 and 32 • Complete FDP parts a, b, i, j, k, l, r • In class • Discuss Cruise Range and Endurance

  15. Fighter Design Project

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