AOPA Live! on Angle of Attack

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Laurence Balter, FAA Gold Seal Certified Flight Instructor from Maui Flight Academy in Maui, Hawaii discusses Angle of Attack Awareness month is April ! and the wonderful folks at AOPA interviewed me on how to use AoA.

#AngleofAttack with #LaurenceBalter from #MauiFlightAcademy
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Once again we have a misunderstanding of the AoA meter and how to best use it. The AoA meter is NOT a replacement for indicated airspeed in the pattern and on approach to land. The tool can be used to AUGMENT by visually verifying the angle of the wing in turns close to the ground. If your airspeed is under control you should still not have trouble making these turns with too much or too little energy possibly leading to excess load factors or pulling up on the nose to maintain altitude and exceeding the critical angle of attack. It is a BACKUP to the basic and proven techniques to fly a given indicated airspeed in the pattern and over the numbers when landing. One other point that is often misunderstood. The Vs0 is the same number regardless of density altitude. The only adjustment should be for gust factor.

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AOA visual displays? Well, no... there are fundamental issues that this video ignored. * Three research papers show that loss of control has unusual attitudes as a factor comparable to AOA. My own research indicates that stall/spin is over-reported as an accident mechanism, and this finding found agreement with an aerospace professor and the head of safety for a major aerospace corporation. In other words, if you count on AOA to prevent loss of control, it will be ineffective for a significant number of events. * AOA has very strange lead/lag characteristics when maneuvering. In other words, you can only really use AOA when everything is calm. That’s what they did in this video, fly smoothly with no quick maneuvering. * AOA is very noisy, especially in turbulence. One way to hide this failing is to make the resolution so coarse that the noise is hidden which, by the way, means that the guidance becomes low precision. They did that in this video, too. Actually, it looks like they were flying pitch attitude (good practice) to find a good AOA in smooth air. * So how do you make a visual that makes AOA look good? Smooth air, smooth maneuvering. Nobody makes AOA videos in up and downdrafts because it would show up the problems with AOA. * Saying that AOA is lift and airspeed is energy is flat out wrong. The lift equation shows that lift depends on BOTH airspeed and AOA. The AOA narrator ought to know that. His platitude does aviation a disservice. * Aural stall warning, yes. Visual AOA? A fad that refuses to go away. One vendor wrote, “I discontinued my AOA glareshield display product 10 years ago because it did not solve the problem.” BTW, I gave a forum at Oshkosh two years back talking about the failings of AOA, and those failings are fundamental, not vendor-specific.

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