Hey, I have been watch some of the turn back and land videos on the RV4. Very interesting indeed. Is it known what the approximate glide ratio is for that aircraft during those evolutions? I'm just trying to relate your results to similar antics I do in other aircraft. Glide ratio is not a great measure for comparisons but I don't know how to ask about any kind of verifiable measure of energy state. My prosaic "understanding" is that an AOA system can give you tools to stay efficient relative to bleeding energy during various maneuvers but I get the feeling that when one says "energy looks good" that is based on it looking like you're going to make the field. (Nothing wrong with that if your aircraft is predictable on those fronts.) I used to operate an airplane that gave exactly NO warning of near stall if you weren't kind of loaded up (g load) and as a matter of self preservation I always did approaches way on the fast side using lots of runway. AOA would have been really keen in that context. I do most of my flying now in a gyroplane and on those you can bank and yank very near touchdown and there is no risk of departure at all. Sink rate increases with bank angle and the rotor speeds up but that just makes it easier to flare as long as you remember to make it straight and fast enough before touchdown. Still a matter of energy management and death awaits inattention, but I wonder if one could plug in rotor disk AOA (defining and measuring that is complex I fear) and rpm to the onspeed gizmo and get some indication of what the usable energy state of the system is. For sure you don't want to be looking anywhere but outside during this kind of operation so the aural thing is a real boon. Regards, and thanks for keeping the testing video coming. Very informative. b

Hello - Just for context I'm comfortable with embedded systems but have not used Arduino for several years. Is anyone running Arduino 1.8.7 (which I assume is still required) on Linux and building from there? I can use a Mac (Catalina 10.15) box if necessary but if it has worked for someone else using LInux/Arduino I'll try that first. Thanks b

Hello - just discovered this gem of a project. In one of the very well done vids of the RV4 there is mention of the system being suitable for light straight wing prop driven aircraft. Is there any reason it would be unsuitable for the Subsonex? Those typically use an AOA that is derived from pitot/static as is the Gen2 so maybe a good option. The only real bother I can see with the Subsonex is that there is significant thrust to pitch coupling but I would expect that to be a "so what". I have been wrong before. Thanks, and thanks very much to whomever for making this thing real and open. B