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Dynon AHAHRS question

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g-iani(at)ntlworld.com
Guest

Posted: Fri Dec 16, 2011 1:59 am Post subject: Dynon AHAHRS question

A question to all those who have done this already.



Where did you locate the ADAHRS unit for your Dynon?  



Obviously each aircraft will have more or less spots available which meet

the criteria depending on other options such as 914 pumps, autopilot servos

etc. It would be useful advice for builders if we have a spot we could

recommend.

Ian Rickard G-IANI XS Trigear, 300hours

Europa Club Mods Specialist

e-mail g-iani(at)ntlworld.com

bill mcclellan

Joined: 28 Jan 2010
Posts: 43

Posted: Fri Dec 16, 2011 7:32 am Post subject: Dynon AHAHRS question

--

fklein(at)orcasonline.com
Guest

Posted: Fri Dec 16, 2011 12:51 pm Post subject: Dynon AHAHRS question

On Dec 16, 2011, at 1:56 AM, G-IANI wrote:



 	  Quote: 	
		   Where did you locate the ADAHRS unit for your Dynon?


	


Ian...I am contemplating locating it aft of the "D" bulkhead  

panel...have yet to bite the bullet...I like Bill McClellan's solution  

of keeping it high...Fred

h&jeuropa

Joined: 07 Nov 2006
Posts: 645

Posted: Sat Dec 17, 2011 5:43 am Post subject: Re: Dynon AHAHRS question

Ian,



We have GRT EFIS and located the magnetometer just aft of the D panel on a shelf we made at the fuselage part line.   GRT recommends in the wing tip.  We really wanted to have the magnetometer in the fuselage rather than in the wing since we have glider wings as well. 



This location has worked OK for us.  We did have to shield the magnetometer (wrapped with aluminum foil) because of RF when transmitting and we have had instances where magnetic materials in the baggage bay affected it, so we watch where we load things now (our tie down stakes!).  The mass balance weight does not affect the magnetometer in this location.



We know of several Europas that have their magnetometer located overhead between the doors and it apparently works well there.



Hope this helps.



Jim & Heather

N241BW

AirEupora

Joined: 01 Nov 2009
Posts: 186
Location: Dixon, CA

Posted: Sat Dec 17, 2011 7:35 am Post subject: Re: Dynon AHAHRS question

I have the MGL Gyros install in the over head between the two doors.  I have air ducted into this area from the tail and have two grasper vents in the panel that covers this area.  



This is close to the center of gravity and has very little steel.

BobD

Joined: 05 Jan 2016
Posts: 112
Location: Sheffield UK

Posted: Mon Nov 21, 2016 7:53 am Post subject: Re: Dynon AHAHRS question

I will be installing a Dynon Skyview System in my Europa in the near future, so have bumped this thread in the hope that since the original date, several more installations have taken place. I would be grateful for any advice or suggestions concerning the location and installation of the ADAHRS unit (and any of the other bits come to that), especially with photos if possible.



TIA

_________________
Bob Dawson
Europa XS TG || 912 ULS || G-NHRJ || Dynon Skyview || PilotAware || SmartAss3

fireflier

Joined: 24 Jun 2012
Posts: 58

Posted: Mon Nov 21, 2016 8:26 am Post subject: Dynon AHAHRS question

Hi Bob

I have my ADHARS installed in the P1 headrest. 



I created a panel in the front of the headrest to access the unit. 



I haven't got any photos, but will get some the next time i am at the aeroplane. 



Regards

Donald

G-PUPY

Sent from my iPhone



 	  Quote: 	
		   On 21 Nov 2016, at 15:53, BobD <rjd(at)bobdawson.plus.com> wrote:

 

 

 

 I will be installing a Dynon Skyview System in my Europa in the near future, so have bumped this thread in the hope that since the original date, several more installations have taken place. I would be grateful for any advice or suggestions concerning the location and installation of the ADAHRS unit (and any of the other bits come to that), especially with photos if possible.

 

 TIA

 

 --------

 Bob Dawson

 XS TG || 912 ULS || G-NHRJ

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=462856#462856

_________________
Fireflier

Fred Klein

Joined: 26 Mar 2012
Posts: 503

Posted: Mon Nov 21, 2016 1:08 pm Post subject: Dynon AHAHRS question

Bob…I’ve located my ADAHRS unit on a shelf just aft of the “D” panel on the stbd side…the shelf pivots and has slot which allows for adjustment in two axes…here’s a pix…Fred

[img]cid:CCE92B70-C654-4CE0-91BB-13E2E2706A48[/img]

 	  Quote: 	
		  On Nov 21, 2016, at 7:53 AM, BobD <rjd(at)bobdawson.plus.com (rjd(at)bobdawson.plus.com)> wrote:

I will be installing a Dynon Skyview System in my Europa in the near future, so have bumped this thread in the hope that since the original date, several more installations have taken place. I would be grateful for any advice or suggestions concerning the location and installation of the ADAHRS unit (and any of the other bits come to that), especially with photos if possible.

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wdaniell.longport(at)gmai
Guest

Posted: Mon Nov 21, 2016 1:18 pm Post subject: Dynon AHAHRS question

I put mine in the roof between the seats pic to follow.Â  I havent flown yet so cant tell whether it works or not.

William Daniell



LONGPORT

+57 310 295 0744



 

On Mon, Nov 21, 2016 at 4:07 PM, Fred Klein <fklein(at)orcasonline.com (fklein(at)orcasonline.com)> wrote:

 	  Quote: 	
		  Bobâ€¦Iâ€™ve located my ADAHRS unit on a shelf just aft of the â€œDâ€ panel on the stbd sideâ€¦the shelf pivots and has slot which allows for adjustment in two axesâ€¦hereâ€™s a pixâ€¦Fred



[img]cid:CCE92B70-C654-4CE0-91BB-13E2E2706A48[/img]



 	  Quote: 	
		  On Nov 21, 2016, at 7:53 AM, BobD <rjd(at)bobdawson.plus.com (rjd(at)bobdawson.plus.com)> wrote:

I will be installing a Dynon Skyview System in my Europa in the near future, so have bumped this thread in the hope that since the original date, several more installations have taken place. I would be grateful for any advice or suggestions concerning the location and installation of the ADAHRS unit (and any of the other bits come to that), especially with photos if possible.

DSCN7321.jpeg

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Filesize:

103.67 KB

Viewed:

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spcialeffects

Joined: 29 Aug 2012
Posts: 306
Location: Kent

Posted: Tue Nov 22, 2016 5:56 am Post subject: Re: Dynon AHAHRS question

I too have mounted mine just behind the D panel. As per Dynons instructions within 1 degree of.............cant remember now but heres mine.

Made a box for my main and back up ADAHR's to sit on top of each other

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AirEupora

Joined: 01 Nov 2009
Posts: 186
Location: Dixon, CA

Posted: Tue Nov 22, 2016 7:44 am Post subject: Re: Dynon AHAHRS question

I don't know the size of your AHAHRS, but I have the MGL and it two units and I place them on the overhear between the doors.  I has worked very well for me.

JonathanMilbank

Joined: 14 Apr 2012
Posts: 391
Location: Aberdeen area

Posted: Wed Nov 23, 2016 1:41 am Post subject: Re: Dynon AHAHRS question

Mine's in the rear fuselage at the bottom and halfway between the D panel and the wooden frame. It sits on a little shelf bonded to the bottom and lies between the two rudder cables, which don't seem to affect its accuracy.

budyerly(at)msn.com
Guest

Posted: Thu Nov 24, 2016 3:32 pm Post subject: Dynon AHAHRS question

Bob,

I have built a number of panels and installed at least six types of Dynons from the original D-10 to D-180s, to a Skyview rewire..

Your panel layout is important for ease of maintenance, interference and security of the AHRS.

 	  Quote: 	
		  From the Skyview manual:

Do not install near high current or magnetism.
	


Avoid steel fasteners which may be magnetic.

Also

The ADAHRS installation location should also adhere to the following requirements:

ï‚· Avoid locations that are lower than the lowest point in the AOA/Pitot/Static system to

reduce the chance of allowing moisture to enter the module.

ï‚· Avoid locations that are subject to severe vibration.

ï‚· Avoid locations that are subject to rapid changes in temperature.

ï‚· Avoid locations that are subject to extreme humidity.

ï‚· Leave ample working room for electrical and pneumatic connections.



NON OF THESE WORKS IN AN AIRPLANE IN FLORIDA OR IN A SMALL AIRPLANE!



Consider the following:

Try to keep an AHARS close to the center axis of the airplane.  In other words near the pitch/roll axis.

Be sure to supply cooling air to the display unit.  The new Skyview runs cooler due to a better processor but the unit still needs help keeping it cool.  Symptom is it blanks out the screen.

The Europa and most composite aircraft are a thermos bottle so you must mechanically get air past the unit.  Cockpit air is good enough.  I suck air from the pax footwell and blow it across the radios, the AHRS display computer, then out the top of the panel via more fans.

Keep that stupid backup battery charged.  It is all you have during the engine start power surge if hooked to the main bus.  The Dynon Skyview in the  Pipistel I am helping on works by turning on the avionics bus then turning it off (so the unit is on its backup power), then hit the start button.  Heck of a thing.    Plan well.

Since pitot and static are necessary, consider the plumbing nightmare.  If you have pitot static errors the avionics tech has to hook up to the AHARS independent of the round gauges.  Plan for it, that way you never need it.  Read the manual on a pitot/static check.  You cannot change the pitot or static pressures while the unit is on.  You have to shut it off between test points!  Duh.



As for the AHARS and Magnetometers:

I have installed them under the pilots seat (Trigear). (Flight control movement is not a problem, but if you have electric fuel pumps keep the pump as far away as practical  or about 3 feet.)

I have installed them in the overhead (do not use the old David Clark massive magnetic headsets or your heading moves with your head).

I have installed them under the radio stack in the panel and had no problems, but the AHARS has to have an aluminum box around it for EMP interference.  I found out later.

Don't worry about stationary metal objects near the magnetometer, it will work.  It is the moving stuff like the mass balance arm.

I have put them into the aft fuselage.  I put it under the baggage bay and it worked fine.

Make sure it is level, solidly mounted, and just in case adjustable in all three axis.  Rubber isolation mounts are not to be used.  I like to use brass screws into brass barrel nuts.  If you are off just a bit, calibration takes care of those 1-2 degree errors.

Test your installation up to full ground run-up before you finish the interior so you can make adjustments.

Ground the AHARS/Magnetometer and Skyview to exactly the same ground plane.  If you use the remote radio/transponder, ground them there too.  Use quality connectors and learn to crimp well.



Buy your sensitive mag compass (I use the SIRS type) and use it to check your desired installation for magnetism problems power on and off.



Setup: 

Once installed, make sure you have ample time to do the setup.  Plan at least an 8 hour day to get everything programmed.  Then record all your settings in case it gets dumped.   Call Dynon if you have a problem.

Note:  I build my panels so they can sit on a bench and be powered up and tested.  Includes antenna and com.  Test your pitot and static on the bench using proper equipment.  Find and correct your leaks.  A couple hundred dollars to an avionics shop is worth it.  I have not had a problem with the engine running and any AHARS I've installed.



I strongly suggest you install round gauge Altimeter and Airspeed and connect them to the Europa pitot tube for a backup.

Pay attention if you want to use the Dynon pitot for your AOA as its location must be well below the wing and near the leading edge as in the setup or it's not worth setting up AOA.

The Dynon pitot has a drain / vent hole so keep it clear.

Do all the setups and updates per the manual, make sure each component is talking to the other and it will work.



Issues:

Pay attention to the tach.  Dynons have tach oscillation problems.  Pay attention as a 912 or 912S have too much voltage for the Skyview, and the 914 is a bit weak at the high end.  I have had to put a pot in to find the right resistance to smooth and lower signal voltage to get it stable.  On the 914, I had to install a tach generator.  On one I had to put a shroud around the magnetometer due to antenna interference.  Go figure only one antenna caused the jumpy heading.

Buy a direct reading pressure gauge as the Dynon/Grand Rapids sensors don't always work as advertised.  If you want exact readings, test, test, test.



I confess I hate every piece of equipment in an aircraft, but if you spend the time, you will make it work the way you want it to (or settle for) and enjoy your experience.



Folks love the Dynon Skyview for its "I don't even have to look out of the cockpit" neat stuff, but read the manuals, read the problem reports, and do the updates.  Dynon tended to release hardware before the software caught up to the real world.  Not so much anymore.



Have a great time, you will enjoy it.



Regards,

Bud Yerly

Custom Flight Creations, Inc.





--

BobD

Joined: 05 Jan 2016
Posts: 112
Location: Sheffield UK

Posted: Sat Nov 26, 2016 5:52 am Post subject: Re: Dynon AHAHRS question

Thanks for all the responses so far, especially the comprehensive write-up from Bud.

I am initially favouring Fred's neat solution behind the D Panel on a shelf, but am intrigued by the idea of locating it in the P1 headset as suggested by Donald, so remain open to being swayed. I look forward to the photos.



I am thinking of using the already installed static pitot in the wing (suitably modified) for the AOA probe, and relocating the static port into the fuselage.I read elsewhere on the thread of three locations at 120 degree apart around the fuselage (with one at bottom centre to allow moisture to escape). Dynon offer a static port kit with all the necessary connections and tube cutter at approx Â£120. I have yet to cost up the individual items, so I don't know if this is good value, or even just worth it to get all the parts from one source.



Any thoughts ?



I just have to say what a wonderful source of information and ideas this Forum is, and such a great boon to newbies like me.

_________________
Bob Dawson
Europa XS TG || 912 ULS || G-NHRJ || Dynon Skyview || PilotAware || SmartAss3

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