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AA311.Lecture15.Slides

# AA311.Lecture15.Slides - AA 311 Lecture 15 Climbing Gliding...

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AA 311 Lecture 15: Climbing & Gliding Flight Dr. Laszlo Techy Department of Aeronautics & Astronautics University of Washington

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Lecture 11 Outline Excess power and rate of climb Constant-thrust example: Maximum rate of climb Maximum climb angle Absolute and service ceiling altitudes Range and time to descend in gliding flight 2
Equations of Planar Motion Parallel to flight path: Perpendicular to path: 3

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Simplifying Assumptions Assume wings level, steady climbing flight. Assume thrust is aligned with velocity : 4
Climb Rate The equations of planar motion become: 5

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Specific Excess Power 6
Specific Excess Power Excess Power: Specific Excess Power ( PS ): 7

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Energy Height The right hand side is a sort of “specific energy” called “energy height”: Note that Specific power is the rate of change of specific energy: 8
Excess Power Propeller-driven aircraft Jet-propelled aircraft 9

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Specific Excess Power & Rate of Climb For a constant-speed climb , the rate of climb is: Rate of climb is also denoted “RC” or “R/C” 10
Maximum RoC 11

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Constant-Rate Climb Climb angle determined by excess thrust .
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