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My RV-8 Build Log
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Date: 9-6-2014
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Number of Hours: 3.00
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Manual Reference:
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Brief Description: Avionics - Magnetometer Bracket Assembly
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Started planning the location of the Garmin GMU 22 Magnetometer and the Dynon Magnetometer.
The Garmin installation instructions contain quite a list of constraints relative to locating the GMU 22. It's sensitive to magnetic metal, and currents of significance. I’ll use shield wire for the AeroLed tail light/strobe on the bottom of the rudder, and will perform the interference check as prescribed.
The Dynon does not have has many constraints, but I am going with the more restrictive of the two in placing the units.
The best location for the RV8 seems to be behind the rear seat luggage compartment. It meets the distance requirement of the steel landing gear, electronics up front, and is aligned as needed.
Used the Instrument Panel left-over plates from the radio stack cut out, which is quite thick, .063, and made two separate plates. The oddly shaped one I trimmed as a rectangle removing the 'tabs'.
Located for each plate where the Magnetometer will sit. The GMU 22 has a round ring which requires a 2.5" hole for the Magnetometer to drop through. The Dynon simply screws to the plate. Both call for using brass screws, washers and nuts, and Loctite 242 for extra security. The Garmin calls for #06-32 100 degree flat brass screws, the Dynon requires #6 pan head. None are provided in either install kit sold by Garmin or Dynon.
Measure and cut the 3/4" L-Angle for the mounting plates to create the mounting bracket that will traverse the fuse. The plan is to rivet the plates to the bracket and bracket to the airframe. I will not use AN3 bolts as these are of course ferrous.
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Support Plates for Garmin GMU 22 and Dynon Magnatometer
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Planning for Magnatometer Installation
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Magnatometer Bracked and Support Plates
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