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  #1  
Old 05-22-2019, 04:36 AM
YvesCH YvesCH is offline
 
Join Date: Feb 2015
Location: Basel, Switzerland
Posts: 255
Default Wingtip Installation with Magnetometer in Tip

Hi everyone,

I am about to install my wingtips but I am not yet sure how to attach them to the wings as I have a GMU-11 magnetometer mounted. The manual requires quite a lot of distance to magnetic materials in close proximity. Now I am afraid about the fastener..

If I would go the piano-hinge route there would be the pin which would be magnetic. With the screws there are the nutplates..

Hod did you guys mount your wingtips ?


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Yves - Basel, Switzerland
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  #2  
Old 05-22-2019, 04:44 AM
noelf noelf is offline
 
Join Date: Nov 2007
Location: Solomons, MD.
Posts: 1,258
Default

The piano hinge pin is stainless material. I have installed a GMU 11 in a Cessna wing, outboard rib, and the wing tip was attached with SS screws and Tinnerman fasteners. No issues.
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  #3  
Old 05-22-2019, 05:35 AM
F1 Rocket F1 Rocket is offline
 
Join Date: May 2008
Location: Melboring, FL
Posts: 226
Default

FYI, I had the magnetometer mounted in that same location in my Rocket and it turned out to be a bad location. The leading edge weight in the Aileron was magnetic and would cause a 2 deg swing as the Aileron moved up and down.
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  #4  
Old 05-22-2019, 06:13 AM
Electrogunner Electrogunner is offline
 
Join Date: Aug 2016
Location: Quarryville ,pa
Posts: 592
Default Wingtip

I just recently moved my GMU 44 to the wingtip because of interference in the tailcone. I have the tips fastened using hinges and the pins are slightly magnetic, but I didn't have any calibration issues with it.
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  #5  
Old 05-22-2019, 06:23 AM
YvesCH YvesCH is offline
 
Join Date: Feb 2015
Location: Basel, Switzerland
Posts: 255
Default

Quote:
Originally Posted by F1 Rocket View Post
FYI, I had the magnetometer mounted in that same location in my Rocket and it turned out to be a bad location. The leading edge weight in the Aileron was magnetic and would cause a 2 deg swing as the Aileron moved up and down.
Ok thanks, I was not sure what would be worse, the lights or the aileron counterweight. I used all shielded and drilled wires but still mounted the Magnetometer in approx. the middle between the lights and counterweight..
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  #6  
Old 05-22-2019, 06:24 AM
YvesCH YvesCH is offline
 
Join Date: Feb 2015
Location: Basel, Switzerland
Posts: 255
Default

Quote:
Originally Posted by noelf View Post
The piano hinge pin is stainless material. I have installed a GMU 11 in a Cessna wing, outboard rib, and the wing tip was attached with SS screws and Tinnerman fasteners. No issues.
Thanks, the screws and tinnerman washers are SS but the nutplates are the ones which concerns me. Did the Cessna have magnetig aileron counterweights?
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  #7  
Old 05-22-2019, 07:55 AM
Dan Langhout's Avatar
Dan Langhout Dan Langhout is offline
 
Join Date: Mar 2008
Location: Huntsville, AL USA
Posts: 611
Default GMU-11 Mount

Just finished a GMU-11 mount in the left wing of my RV-7. Mounted to the rib straddling the end of the spar. Wingtip is held on by 4-40 stainless screws into non-stainless nutplates on the wingtip. The G5 interference test showed the aileron counterweight and the landing/taxi light wires were the largest disruptors - but both were well within limts (<25%). The GMU-11 calibrated and worked just fine.
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  #8  
Old 05-22-2019, 09:15 AM
Bavafa Bavafa is offline
 
Join Date: Oct 2007
Location: Sacramento, CA
Posts: 3,639
Default

I have my GMU 11 in exact same place in a RV14 and have zero issue. The mag calibration testing went without any issues and so far have not has any issues with heading or otherwise.
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