Mumby Posted December 8, 2018 Posted December 8, 2018 Particularly in reverse.... Is the top image also you flying in reverse? Or is that 26 knots forward? If you are flying backwards I suppose AoA should be ~180 degrees.
Dr.SquirrelBoy12 Posted December 8, 2018 Posted December 8, 2018 It looks like it is displaying -171.4 but the - is hidden by the aoa symbol. Modules: FC3, A-10C, M2000C, MiG-21bis, F-86F, AV-8B NA, F/A-18C, F-14A/B, F-16C, F-15E, F-4E, A-29, Eurofighter Typhoon, A-6E, MiG-23MLA, Nevada, Persian Gulf, South Atlantic, Syria, Afghanistan Specs: Intel i7 2600K, Nvidea GTX 980, 16GB RAM, NVMe SSD, Saitek X-55, TrackIR 5, Samsung Odyssey VR
Frederf Posted December 8, 2018 Posted December 8, 2018 What is unusual about the AOA readout? The air flow is coming from behind the airplane with aft velocity in still air.
Lixma 06 Posted December 8, 2018 Author Posted December 8, 2018 After hurting my brain for a while I concede it makes sense....but....I do wonder if displaying something like -14° wouldn't be more useful than 166°? It tells the pilot exactly what he wants to know without having to perform any mathematics.
Shadow_1stVFW Posted December 8, 2018 Posted December 8, 2018 After hurting my brain for a while I concede it makes sense....but....I do wonder if displaying something like -14° wouldn't be more useful than 166°? It tells the pilot exactly what he wants to know without having to perform any mathematics.Except that's not how the math works out. It's actually 166 not -14. AOA is a very specific number and means a very specific thing. Sent from my SM-G960U using Tapatalk Aurora R7 || i7K 8700K || 2TB 7200RPM SATA 6Gb/s || 2TB M.2 PCIe x4 SSD || GTX 1080 Ti with 11GB GDDR5X || Windows 10 Pro || 32GB Dual Channel DDR4 at 2667MHz || Virpil Warbird Base || Virpil T-50 Stick || Virpil MT-50 Throttle || Thrustmaster TPR Pedals || Oculus Rift
Lixma 06 Posted December 8, 2018 Author Posted December 8, 2018 Except that's not how the math works out. It's actually 166 not -14. AOA is a very specific number and means a very specific thing. Sent from my SM-G960U using Tapatalk Yes, that's how the math works out, I'm not disputing that - I'm wondering what is more useful to the pilot.
Frederf Posted December 8, 2018 Posted December 8, 2018 Normal AOA convention is 0 to 180 and -0 to -180. Positive AOA comes from below the airplane. Negative AOA comes from above. 166 and -14 are not the same direction. -14 AOA means airflow is coming from 14 above airplane's nose. 166 AOA means airflow coming from 14 degrees below airplane's tail.
Fangsout Posted January 9, 2019 Posted January 9, 2019 While in jet-borne flight, your AOA doesnt really matter that much. I'd be more concerned about your attitude denoted by the witch's hat.
Captain Orso Posted January 10, 2019 Posted January 10, 2019 This isn't a hidden critique. I honestly want to know. What is the difference between "attitude" and AoA? When you hit the wrong button on take-off System Specs. Spoiler System board: MSI X670E ACE Memory: 64GB DDR5-6000 G.Skill Ripjaw System disk: Crucial P5 M.2 2TB CPU: AMD Ryzen 7 7800X3D PSU: Corsair HX1200 PSU Monitor: ASUS MG279Q, 27" CPU cooling: Noctua NH-D15S Graphics card: MSI RTX 3090Ti SuprimX VR: Oculus Rift CV1
bkthunder Posted January 10, 2019 Posted January 10, 2019 This isn't a hidden critique. I honestly want to know. What is the difference between "attitude" and AoA? Attitude is what you read on the artificial horizon, AoA is the angle at which the (relative) airflow is hitting the leading edge of the wings. E.g. Take your F-15 and climb straight up at 500 knots: your attitude is, say, 70 degrees nose up, your AoA is close to 0. Windows 10 - Intel i7 7700K 4.2 Ghz (no OC) - Asus Strix GTX 1080 8Gb - 16GB DDR4 (3000 MHz) - SSD 500GB + WD Black FZEX 1TB 6Gb/s
Captain Orso Posted January 10, 2019 Posted January 10, 2019 Ahhh yah duh. I was mentally adding the velocity vector always being on the horizon :doh: Thanks :D When you hit the wrong button on take-off System Specs. Spoiler System board: MSI X670E ACE Memory: 64GB DDR5-6000 G.Skill Ripjaw System disk: Crucial P5 M.2 2TB CPU: AMD Ryzen 7 7800X3D PSU: Corsair HX1200 PSU Monitor: ASUS MG279Q, 27" CPU cooling: Noctua NH-D15S Graphics card: MSI RTX 3090Ti SuprimX VR: Oculus Rift CV1
Fangsout Posted January 10, 2019 Posted January 10, 2019 (edited) Angle of Attack indicator making no sense Slight correction: AOA is the DIFFERENCE between relative airflow and the chord line of the wing. On the HUD attitude will be the difference between the witch’s hat and the artificial horizon. The key to maintaining a stable hover is keeping the witch’s hat at the same point it is when the jet is on deck; Approximately 2*. If your attitude is not at this baseline state, the relative angle of your nozzles to the deck will be different. So with nozzles at 82 which is where the hover stop is, if your witch’s hat is on the horizon your actual nozzle angle would be something more like 80 which will lead to a forward drift. The opposite is true if the witch’s hat is at ~4*. With regards to the AOA readings while jet borne: the way the aoa gauge sensor works is it is a conical shaped piece of metal with holes in it. While jet borne, there is little to no appreciable air going over the sensor so your readings will be inaccurate. Sent from my iPad using Tapatalk Edited January 10, 2019 by Fangsout
Zeus67 Posted January 10, 2019 Posted January 10, 2019 This isn't a hidden critique. I honestly want to know. What is the difference between "attitude" and AoA? The AOA gauge uses wind pressure vanes to determine the correct angle of attack. In jetborne flight, these vanes are misreading thus the wrong values. Attitude: Is the name given to the aircraft orientation relative to Earth's horizon. It has three axis: Pitch (the nose pointing up or down). Roll (the wings level or not) and Yaw (the nose pointing left or right). AOA: https://en.wikipedia.org/wiki/Angle_of_attack "Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." "The three most dangerous things in the world are a programmer with a soldering iron, a hardware type with a program patch and a user with an idea."
Captain Orso Posted January 11, 2019 Posted January 11, 2019 Thanks Zeus! My brain-fart is what threw me off :D When you hit the wrong button on take-off System Specs. Spoiler System board: MSI X670E ACE Memory: 64GB DDR5-6000 G.Skill Ripjaw System disk: Crucial P5 M.2 2TB CPU: AMD Ryzen 7 7800X3D PSU: Corsair HX1200 PSU Monitor: ASUS MG279Q, 27" CPU cooling: Noctua NH-D15S Graphics card: MSI RTX 3090Ti SuprimX VR: Oculus Rift CV1
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