Dihedral in RV14 (GMU-22)

[MED]

I just bought the mounting bracket Garmin makes for the GMU-22 and mounted it about mid-chord on the left wingtip. I have no idea about the dihedral, but it works perfectly.

[Jetmart]

Originally Posted by MED

I just bought the mounting bracket Garmin makes for the GMU-22 and mounted it about mid-chord on the left wingtip. I have no idea about the dihedral, but it works perfectly.

Great - Thanks

[MED]

Stein has the mount for left or right wingtip - $75.

[Ralph Inkster]

one solution is
https://www.steinair.com/product/gmu...p-mount-right/

or google these for more ideas for brackets
"wingtip magnetometer mount", or
"Dynon wingtip magnetometer mount"

for alignment use a smartphone digital level on the center spar carry through to get airframe level and translate same angle to the mount sideways axis. than use your phone for the panel angle measurement plus 90 deg for front/back axis of the bracket.

If possible mount the magnetometer as far back on the wing rib as practical to minimize lamp/strobe/ads-b interference (if applicable)

[Pat Hatch]

If I were building an RV-14, I would put the GMU 22 in the wingtip--personal preference after having mounted several in different airplanes. It's just going to give you better odds for good performance and maximizing the interference test results.

So, Garmin specifies a 3° tolerance from level flight for the GMU 22. I would attach the mount to the wing tip equidistant from interference sources and then level it with a digital level with the aircraft set at level flight attitude. Shim as necessary. Close enough.

Note: If the RV-14 has the iron pipe in the aileron leading edge, you should mount the magnetometer about half way on the chord line--avoid interference equally from tip lights and the iron pipe in the aileron.

[Ralph Inkster]

good call, I forgot about that pipe

[bkervaski]

Just as a data point my regulated pitot is in the same wing .. but I grounded it next to the unit vs running the ground all the way back to the fuse.

I can see where running a power and ground next to the magnetometer might cause interference.

But no issues in 200 hours.

(I have a thread out there where my first GMU-22 was bad and I was dragging the airplane all over the field in 100 degree Alabama humidity - which translates to no less than 1,000,000 actual degrees - trying to calibrate it .. I think I lost about 20 pounds that day )

[czechsix]

Originally Posted by Ralph Inkster

good call, I forgot about that pipe

The pipe in the leading edge of the -14 aileron is stainless steel. I held mine up next to a compass and it had no effect at all so it shouldn't be an issue locating the magnetometer near the aileron.

[BCP Boys]

Not to change the subject but why are you putting a GMU 22 in your RV14 and not a GMU 11? I know RV14s are fast but not fast enough that they require a GMU 22 instead of an 11 and since no one has asked that question, I'm assuming this is common or suggested for some reason. . . I'm just asking to learn. No other reason than that.

[Reflex]

Not to change the subject but why are you putting a GMU 22 in your RV14 and not a GMU 11? I know RV14s are fast but not fast enough that they require a GMU 22 instead of an 11 and since no one has asked that question, I'm assuming this is common or suggested for some reason. . . I'm just asking to learn. No other reason than that.

Good question. I'm using the -22 because I didn't want to run the canbus all the way to the wingtip. My electrical scheme works better making the aileron servo and the elevator servo the ends of the canbus.

A couple of notes:

• Got a note from tech stating that the dihedral is 3.5 degrees
• I'm using the bracket from Stien, but it does NOT have the dihedral angle built in.