Angle of attack indicators

[Moeggeploeg]

[quote=BobTurner;1231260]I agree that a visual AOA display should be up high - a HUD being best. But several of the EFIS based units also put out an audio warning tone (slow beeps, progressing to rapid beeps, progressing to a solid tone just prior to stall). For stall avoidance these work pretty well imho, and let you keep your eyes outside.

Alpha systems AOA
https://www.youtube.com/watch?v=W6kF6YvUPiA

[Caldale]

I have been using on speed aoa for around a year now and really like it .
You can find info on it by typing on speed aoa on you tube.
It uses an arduino board that uses info from a dynon or other products that are similar .
After I got used to using and trusting it I hardly look at the airspeed indicator, which keeps my vision primarily outside where it should be.

[FinnFlyer]

I read the threads on adding a DIY port for AOA input to EFIS (e.g. Dynon), some using a pop rivet under the wing, some a inflation needle.

Since I'm not eager to drill extra holes in the wing skin, this just occurred to me:
In the RV-3 and RV-4 (and probably other RVs) the tie-down hole is just next to the pitot fitting. Drill a small hole in the tie-down bracket (W-422) that will reach near the top of the 3/8" threaded hole. Fit a needle or something into that small hole and tube to AOA port on EFIS

Now you can add a temporary 3/8" fitting of some kind with an alu tube you can bend until you get an acceptable angle (for the EFIS to be able to be calibrated).

By 3/8" fitting I mean something that will screw into the tie-down hole.

When you have found the right angle and are tired of screwing in and removing the test probe to instal the tiedown ring, make a permanent install next to the pitot tube.

Just an idea I'll try out on my Flying RV-3B that has a Dynon 10A in it.

Finn
(too cheap to spend $ on a Dynon pitot tube)

[Pilot135pd]

Originally Posted by Dean Pichon

Hi Wyn,

I just installed the Dynon AoA probe in my completed RV-4 in November. I already had a D10A installed so the display component was a none issue.

I had to remove the tank to run the 2nd pitot line to the Dynon instrument. With the Dynon probe, it is necessary to drill and tap the mast portion to attach to the mounting base installed in a flying aircraft.

In addition, I had to run a wire from the Dynon unit to my intercom and install a potentiometer in the panel to allow me to adjust volume of the audio signals in my headset. The Dynon instructions are pretty good.

I'm still learning how to best use it, but I believe it will be a great addition to my aircraft.

Good luck,

Did you replace the stock Van's pitot tube with the Dynon AOA pitot tube? That's what I want to do in my RV-8. It has the stock Van's pitot tube and need to know if the mount will work or if I have to buy a new mount.

I want to buy this style AOA pitot tube one from Dynon as it looks like the one I have now

https://www.dynonavionics.com/includ...Dimensions.pdf


but if I have to replace the mount I might go with the L style which doesn't extend so low under the wing.

[Dean Pichon]

Originally Posted by Pilot135pd

Did you replace the stock Van's pitot tube with the Dynon AOA pitot tube? That's what I want to do in my RV-8. It has the stock Van's pitot tube and need to know if the mount will work or if I have to buy a new mount.

I want to buy this style AOA pitot tube one from Dynon as it looks like the one I have now

https://www.dynonavionics.com/includ...Dimensions.pdf


but if I have to replace the mount I might go with the L style which doesn't expend so low under the wing.

My -4 had a standard AN5812 (L-shaped) pitot tube. The mount for this pitot accepted the Dynon (L-shaped) AoA probe.

My mount looks like this one: https://www.aircraftspruce.com/catal...?clickkey=5714

It was necessary to drill and tap 4 holes into the probe to make the attachment to the mast.

Good luck,

Dean