D-180 magnetometer mounting in RV

[pearlman]

I am installing a D180 in an RV6A. I am considering intalling the magnetometer in the rear of the aircraft on the deck just before the front stabilizer spar. I have the ELT between the front and rear stabilizer spar. I also have electric elevator trim in the left elevator. Does anyone have experience with magnetometer installations in the rear of an RV6/RV7?  In the installation, have you seen any interference?
I have two magnetometers for this position. Can They be mounted side by side?

 

[dynonsupport]

Two magnetometers can be mounted side by side with no problems.

We wouldn't suggest it being too close to a trim servo, due to the magnets in the motor.

Many RV installs put them right behind the baggage compartment firewall. This tends to be a pretty clean place.

 

[pearlman]

Two magnetometers can be mounted side by side with no problems.

We wouldn't suggest it being too close to a trim servo, due to the magnets in the motor.

Many RV installs put them right behind the baggage compartment firewall. This tends to be a pretty clean place.


Thank you. I guess we come to the question of what is "too close". I estimate that the distance from the trim motor to the position I was thinking about for the magnetometer is about 18" and there are eight 1/4 inch steel aircraft bolts that will be about 3-4 inches away. In the area behind the baggage compartment firewall at floor level is the autopilot motor for pitch and rearward near the next bulkhead is the strobe power (say 2 feet away). I tend to put them int he fuselage because there are strobes on the wing tips and head lights which are flashing.

 

[dynonsupport]

The bolts shouldn't be a problem, but it's hard to say about the trim motor.

One experiment you can try is to run the trim motor and observe the effects it has on a regular boy scout compass. That should give you an idea on how far away the magnetic fields reach.