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  #1  
Old 02-22-2014, 05:22 AM
Bayou Bert's Avatar
Bayou Bert Bayou Bert is offline
 
Join Date: Sep 2012
Location: Prairieville, LA
Posts: 221
Default Magnetometers Rear Deck?

Thinking of mounting the two magnetometers on the rear deck
of my 9A in front of the HS/VS. Wiring for elevator trim, position lights
and strobe have to be at the bottom of fuselage. Cables for the rudder too.
Planning on mount the dual AHRS right of centerline just
behind baggage bulkhead. I already have the pitch servo and the power supply for the Whelen strobes there
on other side of center line.
Is this going to work?
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  #2  
Old 02-22-2014, 05:56 AM
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Sam Buchanan Sam Buchanan is offline
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Join Date: Dec 2004
Location: North Alabama
Posts: 4,228
Default

Quote:
Originally Posted by Bayou Bert View Post
Thinking of mounting the two magnetometers on the rear deck
of my 9A in front of the HS/VS. Wiring for elevator trim, position lights
and strobe have to be at the bottom of fuselage. Cables for the rudder too.
Planning on mount the dual AHRS right of centerline just
behind baggage bulkhead. I already have the pitch servo and the power supply for the Whelen strobes there
on other side of center line.
Is this going to work?
That magnetometer location has worked flawlessly in my RV-6 for 13 years, first as a beta tester for an unnamed EFIS manufacturer that is no longer with us, and since then for two Dynon mags.

However, having all the other stuff at that location may be a problem for you. Use a Boy Scout compass to see if there are magnetic fields being generated that will upset the mags. If you do end up using the deck, waterproof the mag, mine is wrapped in a plastic bag.
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  #3  
Old 02-22-2014, 06:27 AM
Tony Rome Tony Rome is offline
 
Join Date: Apr 2012
Location: Illinois
Posts: 38
Default iphone Magnetometer

Good morning,
There is also a free iphone app called magnetometer which will measure the
magnetic fields you are trying to avoid. I've found it is quite sensitive and works great.
Good luck on your project,
Tony
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  #4  
Old 02-22-2014, 08:06 AM
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pierre smith pierre smith is offline
 
Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,832
Default Check

My buddy, an RV builder assist center, says that some magnetometers have to have a minimum distance from each other to avoid interfering with each other (AFS systems), so do some checking.

Best,
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  #5  
Old 02-22-2014, 09:12 AM
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RVbySDI RVbySDI is offline
 
Join Date: May 2005
Location: Tuttle, Oklahoma
Posts: 2,562
Default

Just to give another point of reference to consider, I fabricated two gussets for mounting my magnetometers on the upper longeron (sp) behind the second bulkhead back from the baggage bulkhead. One on either side. It works great in that location. I used Velcro and brass screws to secure the magnetometers to the gusset. If I can find a photo I will try to post it here.

Know that if you have a slider, that second bulkhead is as far forward as you should mount the magnetometers. If you mount further forward than that when the slider is open the steel frame of the canopy will cause disturbance in the magnetic field.

Update:
I found some pics of my magnetometer mounts that I took during construction. This pic shows the location of the two magnetometers with the gussets riveted to the current bulkhead location.


This pic is a good shot of how I mounted the gussets. However, you might notice it shows the gussets mounted to the baggage bulkhead instead of the second bulkhead back. This position had interference from the steel canopy frame so I had to move it back to the second bulkhead where it currently sits and does great.


P.S. These are GRT magnetometers. You did not state which manufacturer you are dealing with. The magnetometers may be of different design than mine so your setup might require a different mount than mine. At any rate, I wanted to give you a different perspective to consider.
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Last edited by RVbySDI : 02-22-2014 at 09:56 AM.
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  #6  
Old 02-22-2014, 09:16 AM
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Dbro172 Dbro172 is offline
 
Join Date: Apr 2012
Location: West Fargo, ND
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Default Some pics

Here:

http://www.mykitlog.com/users/displa...g=180922&row=8
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  #7  
Old 02-23-2014, 07:03 AM
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TomVal TomVal is offline
 
Join Date: Dec 2007
Location: SC & CA
Posts: 890
Default

Quote:
Originally Posted by RVbySDI View Post
Just to give another point of reference to consider, I fabricated two gussets for mounting my magnetometers on the upper longeron (sp) behind the second bulkhead back from the baggage bulkhead. One on either side. It works great in that location. I used Velcro and brass screws to secure the magnetometers to the gusset.
Steve,

Timely input. I was planning to relocate my GRT magnetometer from the forward baggage compartment (poor location) to aft of the baggage compartment bulkhead. I like your location idea. I plan to take a closer look at location options when I open up the back to install the -12 fuel vent line.
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