ASE 167M - Lecture 3

# ASE 167M - Lecture 3 - ASE 167M Lecture Three Stalls and...

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ASE 167M Lecture Three Stalls and Spins Flight 3 Briefing

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Lecture #3 ASE167M – Apurva Chunodkar Today’s Topics Questions? Stall Speed - Minimum level flight speed attainable or usable in flight. Types of Stalls Conventional Stall Power-on and Power-off stalls Spin (Autorotation Stall) Deep stall Problems Associated with Stall Control Problems Flight 3 Briefing 09/18/11 2
Lecture #3 ASE167M – Apurva Chunodkar The Nature of Stall t=1 t=5 t=8 t=7 time C L t=3 Maximum Lift 09/18/11 3

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Lecture #3 ASE167M – Apurva Chunodkar Sudden, equal loss of lift on both wings and increase in drag Conventional Stall 09/18/11 4 As α increases, flow separates from wing due to adverse pressure gradient
Lecture #3 ASE167M – Apurva Chunodkar Conventional Stall Nose down pitch moment. the tips. Why? Different angle of attack Warning from airframe buffeting due to flow separation Warning from stall horn Is the aircraft designed for this kind of stall? 09/18/11 5

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Lecture #3 Conventional Stall ASE167M – Apurva Chunodkar 09/18/11 6
Lecture #3 ASE167M – Apurva Chunodkar Conventional Stall Stall speed for steady level flight is given by What is the effect of weight on stall speed? – As W increases V stall increases max 2 2 1 2 L Stall L SC W V SC V W L ρ = = = L α C L,Ma x 09/18/11 7

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Lecture #3 ASE167M – Apurva Chunodkar Example Problem • Assume 1500 kg aircraft, S W = 10m 2 , C L = 1.3, flying @ ~sea level with standard atmosphere ( ρ = 1.225 kg/m 3 ).
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## This note was uploaded on 09/18/2011 for the course ASE 167M taught by Professor Staff during the Spring '10 term at University of Texas.

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ASE 167M - Lecture 3 - ASE 167M Lecture Three Stalls and...

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