3241 Lecture 13

3241 Lecture 13 - MAE 3241 AERODYNAMICS AND FLIGHT...

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Unformatted text preview: MAE 3241: AERODYNAMICS AND FLIGHT MECHANICS Further Examples of Infinite Wing Implications April 9, 2007 Mechanical and Aerospace Engineering Department Florida Institute of Technology D. R. Kirk 2 RECALL U2 VS. F-15 EXAMPLE • Cruise at 70,000 ft – Air density highly reduced • Flies at slow speeds, low q ∞ → high angle of attack, high C L • AR ~ 14.3 eAR C c C L d D π 2 + = L SC V W L 2 2 1 ∞ ∞ = = ρ • Flies at high speed (and lower altitudes), so high q ∞ → low angle of attack, low C L • AR ~ 3 U2 F-15 AR ↑ and D i ↓, but which to control b 2 or S? 3 WING LOADING (W/S), SPAN LOADING (W/b) AND ASPECT RATIO (b 2 /S) ( 29 ( 29 ( 29 AR S W C eq D D AR S W S b S W S b W SC q b W eq D D b W eq D SC q D AR b S W b W D i D i i D 2 , 2 2 2 2 2 2 , 2 2 , 1 1 1 1 ∞ ∞ ∞ ∞ ∞ = = = = = = = π π π Span loading (W/b), wing loading (W/S) and AR (b 2 /S) are related...
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3241 Lecture 13 - MAE 3241 AERODYNAMICS AND FLIGHT...

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