Well, I do think that the airspeed sensor is either not well calibrated, or not well placed (or both). I think it's reading a bit lower than what the real value is.
But having said that, I still think that it's working well enough as an additional indicator to prevent the stall. Here's why:

In the maiden video, there was pretty much steady wind blowing from the west. And you can in fact notice, that when I fly west, the airspeed and groundspeed are quite close to each other (about 10 km/h difference), while flying east, the groundspeed is significantly higher (more than 30 km/h) - so that does make sense and works as it should.
In the second video, there was close to no wind, with occasional but quite weak gusts. So that day, there was almost no upwind or downwind direction existing.

I've also noticed that the indicated airspeed varies from the groundspeed quite a bit while pitching up or down - I guess that's because of the angle of the pitot tube against the air during those manuvers.

So to sum it up - the airspeed sensor I have, placed where it is, I think that it doesn't really read the correct value, BUT it reads the value reliably enough that once I find the lowest possible value for the plane to stall, I can reliably use that value as a threshold I have to stay away from.

I agree that it is definitely a good indicator and I think I'm going to install one as well.

I am trying to find something that will help me on long range flights. I've been pushing the battery to the limit trying to extend the range and I got scared on the last flight because I misjudged how much of a tailwind I had going out; thus, creating a real issue with a strong headwind returning.

I was using my time and GPS speed to note how much faster my trip going out got me to a checkpoint, but simply misjudged just how much faster. So, the ride home pushed me to the limit with the battery.

Since that flight, I've been trying to discern a way to get an accurate ground speed vs airspeed and that's why the pitot system appealed to me.

I think I would mount mine in the same place you did, so I'm not sure how you could get much more accurate with placement.

Just so you don't think the Binary is just hanging on the wall 



Did anyone say raaaange?



Oh and the 360 camera is pretty awesome for the post flight video viewing. Just comfortably sitting, enjoying the flight and looking around - perfect!



But the next step is to switch the Binary over the Matek F722 Wing FC (I have to say I've read too many stories of the F411 Wing servo BEC failing mid flight to fully trust it - plus it can't even handle the flaps servos with the current setup, so I'm afraid I'm quite pushing it already) and more importantly to the DJI system. Let's see how it goes, stay tuned

Izzy,

I'm using the F722 Wing on mine and it works great.

Love the Rannnge setup:-)