Dynon Pitot/AOA Mast Locale

[rockitdoc]

Hi,

Rooting around the forum I found several posts on the Dynon pitot/AOA for other birds but none for our -14's.

If anyone has installed one I have a couple of questions:

1. Which bay in the wing did you locate it?
2. If you located it aft of the main spar using the Dynon supplied mast, how did you manage to get the tip of the probe to be 2-12" from the leading edge as specified by Dynon.
3. If you did not use the Dynon mast, what did you use or fabricate?

Thanks, in advance, as usual

Scott

[Carl Froehlich]

Locate just past the bell crank bay. Follow the instructions to mount the mast flange to the main spar. The standard Dynon pitot/AOA will work perfectly in this location.

Carl

[rockitdoc]

Originally Posted by Carl Froehlich

Locate just past the bell crank bay. Follow the instructions to mount the mast flange to the main spar. The standard Dynon pitot/AOA will work perfectly in this location.

Carl

Which direction? Inboard or outboard of the bell crank bay. Outboard seems correct to keep it away from moving pushrods and such and also the prop wash, but I haven't installed the flaps and ailerons so don't know what might be conflicting.

Also, the tip of the pitot will be 16" aft of the leading edge. Dynon indicates that 12" is the limit. I presume you have mounted one as you describe and it works. That's good enough for me, if so.

[Carl Froehlich]

Originally Posted by rockitdoc

Which direction? Inboard or outboard of the bell crank bay. Outboard seems correct to keep it away from moving pushrods and such and also the prop wash, but I haven't installed the flaps and ailerons so don't know what might be conflicting.

Also, the tip of the pitot will be 16" aft of the leading edge. Dynon indicates that 12" is the limit. I presume you have mounted one as you describe and it works. That's good enough for me, if so.

Outboard. But just outboard of the bell crank bay rib. You want to be able to reach in to make the electrial and pitot/AOA connections. I put a #6 nutplate on each end of the pitot heat control box and mounted it in the same bay as the pitot, the two mounting screws going from the inside of the bell crank bay through that rib so that the box is on the other side of the rib from the bell crank.

This is how I mounted it on five RVs. All work perfectly.

Carl

[rockitdoc]

Originally Posted by Carl Froehlich

Outboard. But just outboard of the bell crank bay rib. You want to be able to reach in to make the electrial and pitot/AOA connections. I put a #6 nutplate on each end of the pitot heat control box and mounted it in the same bay as the pitot, the two mounting screws going from the inside of the bell crank bay through that rib so that the box is on the other side of the rib from the bell crank.

This is how I mounted it on five RVs. All work perfectly.

Carl

Thanks Carl. I will sleep better knowing this. Really!

[rockitdoc]

Here's how I intend to mount it:

[Bavafa]

Originally Posted by rockitdoc

Here's how I intend to mount it:

Attachment 23877

I have done it similar to this but at the standard position in the plan on both of my RV14 and my TAS has been verified to within less than a 1 knot accuracy at all ranges of the speed.

[rockitdoc]

The aluminum pitot and AOA tubes coming out of the probe are within 1" and 1.5" from the top skin. If I connect the poly to them in this position the poly will kink.

Two options as I see them:

1. Cut the aluminum tubes so a straight fitting from poly to aluminum does not kink the poly.

or,

2. Bend the aluminum tubes to be parallel to the main spar so the poly goes on straight also avoiding a kink.

Problem with No. 2 is that probe can not be removed for maintenance and repair if necessary. I think.

What have others done?

Thanks,

Scott

[AlexC]

Originally Posted by rockitdoc

2. Bend the aluminum tubes to be parallel to the main spar so the poly goes on straight also avoiding a kink.

Problem with No. 2 is that probe can not be removed for maintenance and repair if necessary. I think.

Here is a pic of what I did (it's a Garmin, but same idea I would imagine) - you can still thread the aluminum tubes through the Dynon (or Gretz) mast. These aren't the final bend positions, but they are close.

_Alex

[Carl Froehlich]

Originally Posted by AlexC

Here is a pic of what I did (it's a Garmin, but same idea I would imagine) - you can still thread the aluminum tubes through the Dynon (or Gretz) mast. These aren't the final bend positions, but they are close.

_Alex

If you stagger the pitot and AOA connection fittings it is easier to get it in and out of the mast.

Carl