REFLECTOR: Where to put your AHRS

[michalk]

My magnetometer is almost under the pilots seat.
The electronic gyros are mounted in the keel.

As far as I can tell with my ground tests, the magnetometer will be okay 
here.  I have oil lines and starter cables running through the left 
duct.  All other wires go through the right duct.

The panel mount compass does not appear to be affected except when 
toggling the propeller pitch motor, and starting.  I can live with 
those.  I specifically wired the panel to keep high current wires away 
from these devices.

Magnetic lines are perpendicular to the current carrying wires.  Mount 
your sensor such that the plane (base of instrument) is co-planar with 
nearby wires.

Magnetic lines cancel each other out as well.  Keep power and return 
lines paired, and as close to each other as possible.  Twisted pair 
wiring is even better.  Sheilding doesn't do any good in this case, 
because that's for capacitive coupling ... but may be required for other 
non-magnetic reasons.

As a final attempt to get a clean compass reading, it *is* possible to 
magnetically shield your power cables.  Use Mu-metal.  It's ungodly 
expensive, and it's a band-aid solution anyway.  It as well as other 
ferrous materials will distort the magnetic fields by redirecting them. 
  You can compensate for this somewhat with adjusting the magnetics 
supplied in the base of your compass.

Al Gietzen wrote:
> For those who are flying with AHRS / Magnetometer...
> 
>  
> 
> Where did you put yours?