In an effort to build academics for our angle of attack project web site, I've put together four short essays that describe the basics of the AOA tone, how to use those references for takeoff and landing, basic energy management considerations and how to use the AOA logic when the engine quits. Since the transition training manual references ONSPEED AOA and L/Dmax when appropriate, I thought I would offer these essays as an additional resource for folks that are interested in learning more about angle of attack and how to apply that during everyday flying. Even if you don't have an AOA system in your airplane, the tone allows you to follow along in the videos if you are interested in learning more about the concepts. If you do have a calibrated AOA system and have accurate displays for ONSPEED and L/Dmax, then the material might offer some insight into how to apply those two key AOAs during some of your flying.
The essays are in pdf format for display on any device and they have imbedded hyperlinks, including video demonstrations.
What is ONSPEED?
A description of the ONSPEED concept: https://drive.google.com/file/d/1q9K...ew?usp=sharing
Takeoff and Landing Using AOA References.
When we land a fighter, we use AOA as the primary reference for energy management during approach and landing. This is how that concept translates to an RV: https://drive.google.com/file/d/1ZTK...ew?usp=sharing
Introduction to Energy Management.
An overview of energy management and how AOA dovetails with that topic when operating in certain parts of the flight envelope: https://drive.google.com/file/d/1Ewt...ew?usp=sharing
Using AOA When the Engine Quits.
A power-off glide is a great way to learn about energy management, and accurate AOA displays (or tones) can be useful maintaining aircraft control when you have a power loss:
As always, I'm looking for suggestions on how to improve or correct any of the training resources, including this material. If you have any ideas, suggestions (particularly on how to improve the videos or the articles) or questions, please drop a line or post!
Edited: Ouch, just realized (30 April) that one of the diagrams in the last paper was incorrect (the ONSPEED "push/pull" model)! No excuse. Diagram is corrected and original link replaced with link to corrected document. Also, over time there will be corrections and edits made to the associated documents. I'll update linked pdf files as that occurs. 15 May 19 Note: found error with emergency turn back discussion in "unload for control" essay, corrected diagram and verbiage. 24 May 19 Note: Small grammatical corrections to all documents. Revised Fig 8 and emergency return after takeoff discussion in "Unload for Control" essay. Updated links to current versions.
31 May 19: Revised emergency turn-back after takeoff discussion in "Unload for Control" article based on flight test. Flight test video is available here for those interested in learning more about using AOA to assist with EM for emergency turn-back: https://youtu.be/K1UlEi_Ew30
. Note that minimum turn back altitude is aircraft and condition dependent; and parameters in the video are only applicable for the airplane utilized for test under test conditions.
3 Jun 19: Revised "What is ONSPEED" essay.
23 Jun 19: Revised energy management and using AOA when the engine fails essays. Repaired link.
2 Sept 19: Add link to five minute briefing for turn-back test/demo: https://youtu.be/U1T-ePy9e94