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Mounting GRT AHRS & Magnetometer

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MauleDriver(at)nc.rr.com
Guest

Posted: Thu Oct 09, 2008 2:18 pm Post subject: Mounting GRT AHRS & Magnetometer

I used Van's RV10 AHRS Bracket kit to install the dual AHRS from GRT.  

When I bought it, I hadn't even selected GRT yet but figured the kit 

would be useful nonetheless.  The kit appears to work well and is 

pre-drilled for the GRT and the Garmin AHRS. Could be useful for other 

AHRS as long as they are not combined with the magnetometer.   Photos here:

http://www.mykitlog.com/users/display_log.php?user=MauleDriver&project 24&category=4053&log=63321&row=1



The only un-verified feature is it's alignment with the aircraft axes.  

Does anyone have any experience with this setup?  Comments?



Now, on to mounting the magnetometers.  I've browsed the archives and 

seen some of the trays built.  It looks like the ideal fuselage location 

is right where the rear seat belts attach.  Sort of midway between the 

elevator trim and elevator autopilot servo which would appear to be the 

main potential antagonists.  I'd welcome any additional comments from 

flying builders regarding magnetometer performance.  And any pics of 

trays would be appreciated too.



Thanks



Bill "panel, engine, wiring, etc" Watson

partner14

Joined: 12 Jan 2008
Posts: 540
Location: Granbury Texas

Posted: Thu Oct 09, 2008 3:34 pm Post subject: Mounting GRT AHRS & Magnetometer

Here's a couple of shots showing what I did.... don't know yet if it works, but should know next week.

 Don.... the bracket guy



--- On Thu, 10/9/08, MauleDriver <MauleDriver(at)nc.rr.com> wrote:



  	  Quote: 	
		  From: MauleDriver <MauleDriver(at)nc.rr.com>

Subject: Mounting GRT AHRS & Magnetometer

To: "RV10-List Digest Server" <rv10-list(at)matronics.com>

Date: Thursday, October 9, 2008, 3:17 PM



 	  Quote: 	
		  --> RV10-List message posted by: MauleDriver <MauleDriver(at)nc.rr.com>



I used Van's RV10 AHRS Bracket kit to install the dual AHRS from GRT.  

When I bought it, I hadn't even selected GRT yet but figured the kit 

would be useful nonetheless.  The kit appears to work well and is 

pre-drilled for the GRT and the Garmin AHRS. Could be useful for other 

AHRS as long as they are not combined with the magnetometer.   Photos here:

http://www.mykitlog.com/users/display_log.php?user=MauleDriver&project 24&category=4053&log=63321&row=1



The only un-verified feature is it's alignment with the aircraft axes.  

Does anyone have any experience with this setup?  Comments?



Now, on to mounting the magnetometers.  I've browsed the archives and 

seen some of the trays built.  It looks like the ideal fuselage location 

is right where the rear seat belts attach.  Sort of midway between the 

elevator trim and elevator autopilot servo which would appear to be the 

main potential antagonists.  I'd welcome any additional comments from 

flying builders regarding magnetometer performance.  And any pics of 

trays would be appreciated too.



Thanks



Bill "panel, engine, wiring, etc" Watson

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_________________
Don A. McDonald
40636

MauleDriver(at)nc.rr.com
Guest

Posted: Thu Oct 09, 2008 6:03 pm Post subject: Mounting GRT AHRS & Magnetometer

Nice!  That solves to problem of keeping Van's belt setup and mounting the unit in a good location.  

 

 It appears to me that a nice bracket can be fabricated that just lays on the longerons.  That would ensure alignment and otherwise be simple if a bit oversized.  But the rear belts would have to be mounted elsewhere (glass top as I understand it).  Or the bracket could be fabricated to incorporate the seat belt anchor - but then you have several ferrous bolts close to the magnetometer.

 

 Thanks

 Bill

 do not archive

 Don McDonald wrote: [quote]                                 Here's a couple of shots showing what I did.... don't know yet if it works, but should know next week.

         Don.... the bracket guy

         

 --- On Thu, 10/9/08, MauleDriver <MauleDriver(at)nc.rr.com> (MauleDriver(at)nc.rr.com) wrote:

         

          	  Quote: 	
		  From: MauleDriver <MauleDriver(at)nc.rr.com> (MauleDriver(at)nc.rr.com)

 Subject: Mounting GRT AHRS & Magnetometer

 To: "RV10-List Digest Server" <rv10-list(at)matronics.com> (rv10-list(at)matronics.com)

 Date: Thursday, October 9, 2008, 3:17 PM

           

            	  Quote: 	
		  --> RV10-List message posted by: MauleDriver <MauleDriver(at)nc.rr.com> (MauleDriver(at)nc.rr.com)



I used Van's RV10 AHRS Bracket kit to install the dual AHRS from GRT.  

When I bought it, I hadn't even selected GRT yet but figured the kit 

would be useful nonetheless.  The kit appears to work well and is 

pre-drilled for the GRT and the Garmin AHRS. Could be useful for other 

AHRS as long as they are not combined with the magnetometer.   Photos here:

[url=http://www.mykitlog.com/users/display_log.php?user=MauleDriver&project 24&category=4053&log=63321&row=1]http://www.mykitlog.com/users/display_log.php?user=MauleDriver&project 24&category=4053&log=63321&row=1[/url]



The only un-verified feature is it's alignment with the aircraft axes.  

Does anyone have any experience with this setup?  Comments?



Now, on to mounting the magnetometers.  I've browsed the archives and 

seen some of the trays built.  It looks like the ideal fuselage location 

is right where the rear seat belts attach.  Sort of midway between the 

elevator trim and elevator autopilot servo which would appear to be the 

main potential antagonists.  I'd welcome any additional comments from 

flying builders regarding magnetometer performance.  And any pics of 

trays would be appreciated too.



Thanks



Bill "panel, engine, wiring, etc" Watson



          	
         	
                         [b]

billderou(at)yahoo.com
Guest

Posted: Thu Oct 09, 2008 6:26 pm Post subject: Mounting GRT AHRS & Magnetometer

Don-

 Your comment about mounting the magnetometer (and possibly the AHRS) at the lateral center between the rear seat mount attach point is dead on target. I have been flying with a Xbow unit which has Magnetometer & Attitude built into one golden cube mounted at this location and have proven that it is accurate with minimum hard iron interference. 

  

 This is actually a very good location for both functions since a mounting plate from left side to right side laying on top of the longeron is automatically aligned with the pitch and roll axis. Mount the unit parallel with a line from nose to tail and its also aligned with the yaw axis. No internal offsets will be needed.

  

 Bill DeRouchey

 N939SB, flying

 billderou(at)yahoo.com (billderou(at)yahoo.com)

  



--- On Thu, 10/9/08, Don McDonald <building_partner(at)YAHOO.COM> wrote:



  	  Quote: 	
		  From: Don McDonald <building_partner(at)YAHOO.COM>

Subject: Re: Mounting GRT AHRS & Magnetometer

To: rv10-list(at)matronics.com

Date: Thursday, October 9, 2008, 4:32 PM



      Here's a couple of shots showing what I did.... don't know yet if it works, but should know next week.

 Don.... the bracket guy



--- On Thu, 10/9/08, MauleDriver <MauleDriver(at)nc.rr.com> wrote:



  	  Quote: 	
		  From: MauleDriver <MauleDriver(at)nc.rr.com>

Subject: Mounting GRT AHRS & Magnetometer

To: "RV10-List Digest Server" <rv10-list(at)matronics.com>

Date: Thursday, October 9, 2008, 3:17 PM



 	  Quote: 	
		  --> RV10-List message posted by: MauleDriver <MauleDriver(at)nc.rr.com>



I used Van's RV10 AHRS Bracket kit to install the dual AHRS from GRT.  

When I bought it, I hadn't even selected GRT yet but figured the kit 

would be useful nonetheless.  The kit appears to work well and is 

pre-drilled for the GRT and the Garmin AHRS. Could be useful for other 

AHRS as long as they are not combined with the magnetometer.   Photos here:

http://www.mykitlog.com/users/display_log.php?user=MauleDriver&project 24&category=4053&log=63321&row=1



The only un-verified feature is it's alignment with the aircraft axes.  

Does anyone have any experience with this setup?  Comments?



Now, on to mounting the magnetometers.  I've browsed the archives and 

seen some of the trays built.  It looks like the ideal fuselage location 

is right where the rear seat belts attach.  Sort of midway between the 

elevator trim and elevator autopilot servo which would appear to be the 

main potential antagonists.  I'd welcome any additional comments from 

flying builders regarding magnetometer performance.  And any pics of 

trays would be appreciated too.



Thanks



Bill "panel, engine, wiring, etc" Watson





	
	




	
 [quote][b]

rv10(at)sinkrate.com
Guest

Posted: Thu Oct 09, 2008 8:24 pm Post subject: Mounting GRT AHRS & Magnetometer

I can't say how well it works but I'll show pictures.  



I fabricated a lightweight shelf using .040" aluminum to attach to the

bulkhead behind the baggage wall.  I attached it with aluminum pull rivets

and used nylon lock nuts and bolts.  The only concern I have is the weight

on the bulkhead and possible vibration while in flight.  The magnetometer

and shelf together are very light so it shouldn't be an issue. I suppose I

could fabricate a bracket to support the bulkhead to the skin above but I

haven't done that and I don't really think it's going to be necessary. 



The seat belt cables are not ferrous metal.  They don't attract a magnet so

they shouldn't influence the magnetometer at all. 



Here's a thread on AFS's forum with some more information including a shot

of Rob's dual install which he says has worked w/o incident.



http://www.advanced-flight-systems.com/forum/viewtopic.php?t=10



-Ben Westfall

#40579

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jesse(at)saintaviation.co
Guest

Posted: Fri Oct 10, 2008 4:11 am Post subject: Mounting GRT AHRS & Magnetometer

That location, in my experience, works very well.  Nice fabrication.   

I have used aluminum nutserts/rivnuts and stainless screws to mount  

here, which is much easier to remove than having to hold a nut and  

unscrew a bolt.



do not archive



Jesse Saint

Saint Aviation, Inc.

jesse(at)saintaviation.com

Cell: 352-427-0285

Fax: 815-377-3694



On Oct 10, 2008, at 12:21 AM, Ben Westfall wrote:



[quote] I can't say how well it works but I'll show pictures.



 I fabricated a lightweight shelf using .040" aluminum to attach to the

 bulkhead behind the baggage wall.  I attached it with aluminum pull  

 rivets

 and used nylon lock nuts and bolts.  The only concern I have is the  

 weight

 on the bulkhead and possible vibration while in flight.  The  

 magnetometer

 and shelf together are very light so it shouldn't be an issue. I  

 suppose I

 could fabricate a bracket to support the bulkhead to the skin above  

 but I

 haven't done that and I don't really think it's going to be necessary.



 The seat belt cables are not ferrous metal.  They don't attract a  

 magnet so

 they shouldn't influence the magnetometer at all.



 Here's a thread on AFS's forum with some more information including  

 a shot

 of Rob's dual install which he says has worked w/o incident.



 http://www.advanced-flight-systems.com/forum/viewtopic.php?t=10



 -Ben Westfall

 #40579

 --

dlm46007(at)cox.net
Guest

Posted: Fri Oct 10, 2008 5:07 am Post subject: Mounting GRT AHRS & Magnetometer

This setup works well also. 



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MauleDriver(at)nc.rr.com
Guest

Posted: Fri Oct 10, 2008 7:04 am Post subject: Mounting GRT AHRS & Magnetometer

That is similar to what I was thinking about.  I assume you have an 

autopilot servo and since you are flying, it must be far enough away.  I 

was thinking of going a little further back.



I'm curious, whose unit is that?  AHRS and Magnetometer or just one of them.



As I recall, you are not using the Van's belt setup.



Thanks.



David McNeill wrote:

[quote] This setup works well also. 



 --

MauleDriver(at)nc.rr.com
Guest

Posted: Fri Oct 10, 2008 7:23 am Post subject: Mounting GRT AHRS & Magnetometer

Real nice  bracket - I'm afraid I can't easily produce something quite 

like that but it's in a great location.  How did you level it?



Ben Westfall wrote:

 	  Quote: 	
		   I can't say how well it works but I'll show pictures.  



 I fabricated a lightweight shelf using .040" aluminum to attach to the

 bulkhead behind the baggage wall.  I attached it with aluminum pull rivets

 and used nylon lock nuts and bolts.  The only concern I have is the weight

 on the bulkhead and possible vibration while in flight.  The magnetometer

 and shelf together are very light so it shouldn't be an issue. I suppose I

 could fabricate a bracket to support the bulkhead to the skin above but I

 haven't done that and I don't really think it's going to be necessary. 



 The seat belt cables are not ferrous metal.  They don't attract a magnet so

 they shouldn't influence the magnetometer at all. 



 Here's a thread on AFS's forum with some more information including a shot

 of Rob's dual install which he says has worked w/o incident.



 http://www.advanced-flight-systems.com/forum/viewtopic.php?t=10



 -Ben Westfall

 #40579

jesse(at)saintaviation.co
Guest

Posted: Fri Oct 10, 2008 8:04 am Post subject: Mounting GRT AHRS & Magnetometer

That looks like the magnetometer for the AFS.  It does not include the  

AHRS.  The AFS AHRS is in the screen itself.

do not archive

Jesse Saint

Saint Aviation, Inc.

jesse(at)saintaviation.com

Cell: 352-427-0285

Fax: 815-377-3694

On Oct 10, 2008, at 10:59 AM, MauleDriver wrote:

[quote] 

 That is similar to what I was thinking about.  I assume you have an  

 autopilot servo and since you are flying, it must be far enough  

 away.  I was thinking of going a little further back.

 I'm curious, whose unit is that?  AHRS and Magnetometer or just one  

 of them.

 As I recall, you are not using the Van's belt setup.

 Thanks.

 David McNeill wrote:

> This setup works well also.

> --

dlm46007(at)cox.net
Guest

Posted: Fri Oct 10, 2008 9:05 am Post subject: Mounting GRT AHRS & Magnetometer

I use the Digiflite II and distance does not seem to be a problem. The gold

box is a Crossbow AHRS including magnetometer and GPS; it is used with the

Cheltons although I believe it is also used with AFS and Optech. The black

box is the GRT magnetometer for the Sport which has its own internal AHRS

with the display unit. 



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rv10(at)sinkrate.com
Guest

Posted: Fri Oct 10, 2008 2:07 pm Post subject: Mounting GRT AHRS & Magnetometer

It was a PIA to make cause I don't really have the equipment for it either.



I laid out a bunch of lines on the aluminum and cut out the shape on the

band saw.  Cleaned things up with the wheel and lots of filing then used my

hand seamers from Avery to make the bends.  That's why there is a relief cut

in the middle of the shelf as the hand seamers are only 3.5" wide so I bent

the front support in two separate bends.  The shelf has a 7 degree downward

tilt to match the backward tilt of the panel.



I leveled the fuselage on the stand across the door sills (which levels the

panel) using a precise carpenters level.  I drilled only one attach hole

through the bracket to allow me to pivot the bracket up/down until it was

parallel with the fuse then drilled another attach hole, clecoed, then

drilled the rest.  The tilt of the bracket was within 1 to 2 degrees of the

panel.  I used some plastic nylon washers to make them closer.



All together took several hours on a couple of different days.



-Ben

MauleDriver wrote: 

 	  Quote: 	
		   Real nice  bracket - I'm afraid I can't easily produce something quite 

 like that but it's in a great location.  How did you level it?

 
	




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Bldgrv10450(at)comcast.ne
Guest

Posted: Fri Oct 10, 2008 3:36 pm Post subject: Mounting GRT AHRS & Magnetometer

Ben,



Your shelf looks great. Turns out I am doing the exact same thing.



Thank you for the spare part. It's nice to have good builders living so 

close (like 2 miles away).



Also thanks, for the bucking bars and help riveting. My tech adviser has me 

drilling out 5 or 6 do-overs.



Paul Grimstad,

RV10   450  fuselage

Portland, Or.

---

Kelly McMullen

Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ

Posted: Fri Oct 10, 2008 4:05 pm Post subject: Mounting GRT AHRS & Magnetometer

Tell John to not be so picky about your rivets. 



do not archive



On Fri, Oct 10, 2008 at 4:35 PM, Paul Grimstad <Bldgrv10450(at)comcast.net> wrote:

 	  Quote: 	
		   



 Ben,


	


 	  Quote: 	
		   Also thanks, for the bucking bars and help riveting. My tech adviser has me

 drilling out 5 or 6 do-overs.



 Paul Grimstad,

 RV10   450  fuselage

 Portland, Or.

_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor
KCHD

Bldgrv10450(at)comcast.ne
Guest

Posted: Sat Oct 11, 2008 1:46 pm Post subject: Mounting GRT AHRS & Magnetometer

Kelly,

You can't find a better tech adviser. He said keep the smile on your face 

and off the rivet.

Some rivets are sure challanging, but better then fiberglass.

Paul

---

wcurtis(at)nerv10.com
Guest

Posted: Sun Oct 12, 2008 12:16 pm Post subject: Mounting GRT AHRS & Magnetometer

While I"m leaning toward AFS, when I was considering GRT, I built this AHRS "shelf" just aft of the firewall.

http://nerv10.com/wcurtis/08fuselage/fuselage31f.html

http://nerv10.com/wcurtis/08fuselage/fuselage31q.html



Since the magnetometer is separate from the gyro, I didn't see the need to mount it any further from the displays only to run a bunch of wires to that location when there is ready space in this location.  



GRT has the footprint for their AHRS on their website and I used it to pre install plate-nuts in the mounting positions.  If I don't go with GRT I can always use it form something else.

http://www.grtavionics.com/File/Install%20Manuals/ahrs_b.pdf



William

http://nerv10.com/wcurtis/

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