WRT OP's question. I'd guess that Butterfly has the sensor input to compute AOA. I don't know if they have the computation resources to complete the calculation in the real time constraints (but they will in the future generation of chips). I don't think that offering this functionality would increase their revenue. It would increase their costs, in particular their liability costs. Has anyone ever been sued for an inaccurate vario reading?


The video raises other questions:

At :30 in the video "he steepens the bank, stalls and spins, even though the aircraft was well above the published stall speed".

I understand that steeper bank increases load factor and that increases the speed at which critical AOA is reached. What I don't understand is why do power pilots use such low Va (such that an increase in bank commonly causes a stall/spin!).

Is it because the stall speeds are so much higher in a power plane relative to the lengths of the runways? So a power pilot needs to fly slow, close to stall speed, to have an acceptable runout?

I also notice in power flying forums that the notion of increasing Va proportional to wind/gust conditions gets little attention.

I noticed power planes fly slow Va (a low multiple of their stall speed), shallow glide slopes and shallow bank turns. Gliders do the opposite. Why?

I'm curious because I'm planning to take some lessons in a tailwheel power Kitfox, and I'd rather not pay to argue these points with my CFI.