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1 ANGLE-of-ATTACK Proprietary Software Systems, Inc. (952) Iris Circle Excelsior MN © copyrighted 1999
2 Importance of AOA Fly by the numbers! Vs, Vx, Vy, V REF, Best Engine out Glide and Max Endurance Most of your Aircrafts critical performance numbers are a function of AOA When you fly airspeed the airspeed actually was derived from AOA © copyrighted 1999
3 What is AOA Angle between the relative wind and the chord of the airfoil The Wright brothers flew AOA and their early aircraft were equipped with a reference stick and a piece of yarn © copyrighted 1999
4 Looping Maneuver AOA=8 Attitude = -90 AOA=8 Attitude=0 AOA=8 Attitude=+90 © copyrighted 1999
5 AOA is referenced to: © copyrighted 1999 Zero Lift Line
6 Most Elegant reference for AOA Orient the reference for AOA so that zero degrees AOA is where the wing creates no lift. L=1/2 C L S w V 2 When the coefficient of lift is zero the wing creates no lift and induced drag is zero. The proper term for this reference is angle from zero lift. © copyrighted 1999
7 Setting AOA Leave everything alone to fly a fixed AOA Trim wheel controls AOA Trim for AOA Perceiving AOA is difficult © copyrighted 1999
8 Gauging AOA Three components to AOA 1.Pitch attitude (angle of fuselage relative to the horizontal) 2.Angle of climb (angle of the flight path relative to the horizontal) 3.Angle of incidence (angle of wing relative to the fuselage) AOA =Pitch attitude + incidence - angle of climb Pitch attitude does not equal AOA © copyrighted 1999
9 AOA=pitch attitude + angle of incidence - flight path angle AOA Attitude Incidence © copyrighted 1999
10 Flying AOA from High Density Altitude Airports © copyrighted 1999
11 Flying at different Gross Weights Stall speed varies with gross weight by the following formula: V s2 = V s1 W 2 /W 1 If the stall speed at 2,000 # GW was 60 K CAS then the stall speed at 3,000# is 73 K CAS The stalling AOA (critical AOA) remains the same at all weights © copyrighted 1999
12 Flying at different angles of bank Stall speed varies with bank angle by the following formula: V s1 = V s2 1/cos If the stall speed at zero degrees bank angle was 60 K CAS the stalling speed at 60 degrees bank is 85 K CAS The stalling AOA (critical AOA) is not affected by bank angle. © copyrighted 1999
13 Flying in turbulence Stall speed varies with turbulence by the following formula: V s1 = V s2 G If the stall speed at 1 G was 60 K CAS the stalling speed in a 2 G bump is 85 K CAS The stalling AOA (critical AOA) is not affected by turbulence. © copyrighted 1999
14 Cumulative Effect Stall speed increases due to weight, bank angle and turbulence are cumulative. If we were to encounter the heavier 3,000# weight, 60 degrees of bank, and the 2 G bump all at the same time, the stalling speed of 60 has now increased to 146 knots. The critical AOA is not affected. © copyrighted 1999
15 Flying Approaches to Landings An aircraft in the landing configuration will stall at the same AOA regardless of airspeed, fuel weight, payload, G loading, bank angle, and turbulence. If the critical AOA is constant during these different conditions then the optimum AOA for an approach is also constant. All approaches are flown at a fixed AOA. © copyrighted 1999
16 Flying the best engine out glide or maximum endurance Lift= V 2 C L A/2 and Drag= V 2 C D A/2 Lift/Drag=C L /C D The L/D ratio is not a function of airspeed or weight. A lightly loaded aircraft will have the same L/D as when heavier except that it will have a slower descent rate and a slower forward speed. Ignoring propeller effects, the best L/D occurs at a fixed AOA. © copyrighted 1999
17 Understanding Lift to Drag L/D max is used in flight for: maximum endurance for jet powered airplanes maximum range for prop driven aircraft maximum climb angle for jet powered aircraft maximum power-off glide range for jet and prop aircraft L/D max occurs at one specific AOA Induced drag Parasite drag stall DRAG Units AOA Total Drag L/D max Normal Command Reverse Command © copyrighted 1999
18 Angle-of-Attack vs. Coefficient of Lift Angle from zero lift (AOA) Coefficient of Lift Critical AOA (stall) Angle Warning AOA (stall warning) Optimum Approach AOA L/D max, best glide, max endurance, best range Zero Lift (induced drag=0) Reverse Command Behind the Power Curve Cruise © copyrighted 1999
19 AOA fidelity and accuracy AOA varies inversely as the square of the airspeed. Therefore, AOA fidelity increases with slower speeds and higher angles-of-attack. At maneuvering speeds and lower, AOA is it aerodynamically. © copyrighted 1999
20 AOA is the ultimate aerodynamic instrument AOA is used to establish the best approach, best climb angles, maximum endurance, long range cruise, best glides and other flight maneuvers. You do not disregard airspeed altogether, but use the airspeed and angle-of-attack to supplement one another. © copyrighted 1999
21 Flying AOA for All Approaches Best AOA for all Approaches. Trim for this AOA. AOA too low. Increase back pressure and trim if necessary. AOA way too high! Lower the AOA and go around. Use the throttle to control the rate of descent! Middle yellow light © copyrighted 1999
22 AOA is Instantaneous but IAS Lags Before Immediately after stick/yoke pull © copyrighted 1999
23 AOA Professional Display Zero lift Best L/D Optimum approach Angle advisory © copyrighted 1999
24 AOA Sport Display Cruise Best L/D Optimum approach Angle advisory Critical AOA © copyrighted 1999
25 Thanks for your attention Fly Safe with ANGLE-of-ATTACK Proprietary Software Systems, Inc. (952) Iris Circle Excelsior MN © copyrighted 1999
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