AOA Pitot Probe

[WestCoastOz]

Can you please explain the difference between the AOA/Pitot Probe and the AOA/Pitot Boom Probe as shown on the order list. Is it possible to see a photo of both probes so as to compare them. I had my D100/D120 factory fitted and I assume the Pitot they fitted was the second type (boom) as it is a straight probe.....am I correct in this assumption?

Thanks

 

[dynonsupport]

Something like 99% of the pitots we sell are the regular, under-wing, non-boom type. It mounts to the under surface of the wing and is "L" shaped, just like the pitots you'd see on most Cessnas. It can be seen here.

The boom type is typically used in applications where for one reason or other, the customer needs just a straight tube without the bend. See a picture of the boom mount here. The pitot tubes that you see on the front of jet fighters, for example, are the "boom" type.

Additionally, our installation guide points to brackets that will work with the normal "L" shaped pitot, but the boom style is provided as-is, without mounting instructions.

 

[WestCoastOz]

Thanks for that info....exactly what I was looking for.

 

[krwalsh]

Any plans to offer a heated boom mount? This is for the nose of a Cozy Mk-IV. If no plans to offer one, can you provide the details (dimensions/drawings) of the nose of the standard boom mount so that I could make a heated version and use it with the new Next Gen EFIS?

 

[dynonsupport]

Kevin,

We do not currently have plans for a heated boom mount.

We have fairly detailed drawings in the Pitot install guide:

http://dynonavionics.com/downloads/...OA_Pitot_Probe_Installation_Guide_-_Rev_B.pdf

We don't have any specific boom mount drawings. It's just a longer tube with no L part on the back.

Remember that you only need our pitot for the AoA function. All other pitots will work for airspeed indications.

 

[krwalsh]

I'm looking to have the AOA available in a heated tube to put on the nose of our plane. The dimension I'm in need of if I were to make my own would be the angle that the AOA port is drilled with respect to the axis of the pitot tube. Can I assume that this angle is something greater than the expected full stall pitch, but that the calibration procedure will correctly span the readout?

 

[dynonsupport]

You actually need to take much more into account than just the angle of the two ports to be able to recreate an AOA-pitot that would work with our system. The entire shape of the pitot snout is engineered to make the AOA port very sensitive to AOA changes, while the pitot port is also designed to be very insensitive to AOA changes. In other words, the precise angle doesn't matter on its own.

 

[krwalsh]

So, if the desire was a heated pitot capable of being boom mounted, would you suggest purchasing the standard pitot tube and machining the mount off of it?

 

[dynonsupport]

We can't really suggest that, though it is theoretically possible. It's also possible that you'll end up with a ruined heated pitot probe that we definitely would not be able to repair or warrant. Our pitot products aren't made to be taken apart and are assembled permanently.

 

[krwalsh]

OK, perhaps the best thing to do, since we're going to have redudant AHRS units (and displays for that matter) is to have two pitot tubes. I'm not a huge fan of the fact that loss of pitot means loss of attitude indication, so perhaps the solution is to have one heated pitot, and one not. Then I could use the standard boom style in the nose, and get the AOA indication. Then I could have a second heated probe elsewhere. That one will probably NOT have AOA. That way I have the best of both worlds, and could get around the pitot loss probelm.

 

[dynonsupport]

Also know that we are working on improving the airspeed requirement (meaning, eliminating it), but don't have a date on when that update might be ready yet.