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  #1  
Old 09-12-2009, 04:48 PM
tomhanaway tomhanaway is offline
 
Join Date: Aug 2006
Posts: 206
Default avionics rack alignment to panel

Did a search and can't find exactly what I'm looking for.
Mounting 430w, sl30, gtx327 and pse 9000b. I understand the whole aluminum rail mounting concept.

My difficulty is where the front of each rack should be. I have the racks and wiring harnesses but don't plan on purchasing the avionics until close to final assembly so I can't just put the avionics in themselves. If I had the actual radio units this would be relatively easy but I don't.

For example, the Garmin install manual for the 430w talks about a 6.3" x 2.7" hole which would actually allow the whole rack mount to slide though the panel and the front of the rack could be slightly though the panel. Others seem to have cut the panel hole slightly smaller (say 6.25" x 2.65" for discussion) and have the mounting rack terminate just behind the panel.

How do I allow for actual differences in depth of faceplates of different units?
Is the best approach to mount racks so that they all come "just up to" the back of panel? Presumably this would have the various avionics protruding into the cockpit by slightly different amounts. Not enough difference to be noticeable?


All help appreciated :^)

Thanks,
Tom Hanaway
Boynton Beach, FL
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  #2  
Old 09-12-2009, 05:43 PM
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boom3 boom3 is offline
 
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Location: Sumner, WA
Posts: 575
Default

Take your time on this part and look in each manual. If I remember correctly the SL30 is an oddball in both width and where the front needs to be.

I'm not much help but definately don't make them all the same.
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  #3  
Old 09-12-2009, 08:45 PM
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frazitl frazitl is offline
 
Join Date: Jan 2005
Location: Las Vegas, NV
Posts: 472
Cool Be sure to measure an acutal unit!

I found that the width varied slightly, but the mounting depth was a bigger problem. If you want all the radio faces flush with each other, the only way you can be sure is to have the radio in hand, or at least take very careful measurements of actual units...

My advice would be to order the radio stack when you're ready to build the rack, but hold off on the EFIS or other instruments 'till you can't wait any longer. The radios are not likely to change, but the EFIS / MFD world is changing much faster.

Good Luck. You'll be gassed no matter what when you push that throttle in for the launch...
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Last edited by frazitl : 09-12-2009 at 08:46 PM. Reason: typo
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  #4  
Old 09-12-2009, 08:50 PM
BillSchlatterer BillSchlatterer is offline
 
Join Date: Jan 2005
Location: Arkansas
Posts: 342
Default How about a visual?

Had the same problem,.. almost! I have the 9000b, 430, 330 and sl40 but the issues are the same with the 30 and 40. To get all of the faces to line up the trays must be in different places. I think the picture tells it all pretty well.

You really need the equipment, not just the trays.



Once they all lined up where I wanted them, I drilled a temporary plate of scap aluminum on each side to hold them all together. Then put it in the rack and drilled it to fit. No trouble if you have the equipment but not sure how you would do it with only the trays.

Hope this helps!

Bill S
7a finishing
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  #5  
Old 09-13-2009, 07:14 AM
terry.mortimore terry.mortimore is offline
 
Join Date: Jul 2008
Location: Sault Ste Marie, Ontario Canada
Posts: 131
Smile Rack set back.

Hi Tom:

I was planning on tackling the same job in a few weeks. Only I'll be using a SL-40 and GTX 327. I have a air gizmo to mount my GPS on the top of the stack.

If you come across the proper set back from the face of the instrument panel I sure would appreciate you sharing it.

Perhaps some one who has gone before can share it with us?


cheers, terry.


P.S. I purchase my trays and will be purchasing the actual radio and transponder from Stein.

You got your ears on Stein?

Last edited by terry.mortimore : 09-13-2009 at 07:18 AM. Reason: Added P.S.
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  #6  
Old 09-13-2009, 08:13 AM
Dave Cole's Avatar
Dave Cole Dave Cole is offline
 
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Location: Roanoke, VA
Posts: 307
Default Mounting trays and mounting depth

Quote:
Originally Posted by frazitl View Post
I found that the width varied slightly, but the mounting depth was a bigger problem. If you want all the radio faces flush with each other, the only way you can be sure is to have the radio in hand, or at least take very careful measurements of actual units...

My advice would be to order the radio stack when you're ready to build the rack, but hold off on the EFIS or other instruments 'till you can't wait any longer. The radios are not likely to change, but the EFIS / MFD world is changing much faster.

Good Luck. You'll be gassed no matter what when you push that throttle in for the launch...
Terry is right, each of the mounting trays needs to be mounted at a different depth behind the panel to get everything to line up. For example, I chose to mount the trays so that the back edge of the bezels all sit flush aginst the front of the panel. For the avionics I installed, that requried the following distance from the front edge of the mounting tray to the front of the panel.

GMA-240, .135"
SL-30, .030"
GNC-300, .166"
GTX327, .120"
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  #7  
Old 09-13-2009, 10:07 AM
nucleus nucleus is offline
 
Join Date: Sep 2006
Location: Bozeman, Montana
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Lightbulb You Don't Necessarily Want Everything Lined up

I have everything lined up, but after 120 hours I now realize that I am going to change that. Specifically I have had issue with myself and the copilot inadvertently changing settings on the transponder and the audio panel. Now I have on my "to do" list recessing the transponder and audio panel so the front edges are flush with the panel rather than the other avionics.

Hans
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  #8  
Old 09-13-2009, 10:35 AM
Bill Dicus Bill Dicus is offline
 
Join Date: Jan 2005
Location: Shorewood, WI (Milwaukee area)
Posts: 773
Default Radio mounting

Just went through painful problem with SL30 mounting. Tube should be flush with front surface of panel according to my installation manual. It was in fact behind the panel and the locking screw mechanism was maladjusted so the radio didn't pull in fully. Also the panel cut out was too small. Net result the pins did not mate effectively - sometimes the radio worked and other times it had no power. It's best to have the radio seat fully in the tube and to do that the panel cut out must be proper and the front edge of the tube flush with the panel (in front). Give me a PM if this doesn't seem clear. Bill
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  #9  
Old 09-13-2009, 10:50 AM
Dan Babenco Dan Babenco is offline
 
Join Date: Nov 2006
Location: Metropolis, Illinois
Posts: 8
Default

Quote:
Originally Posted by tomhanaway View Post
Did a search and can't find exactly what I'm looking for.
Mounting 430w, sl30, gtx327 and pse 9000b. I understand the whole aluminum rail mounting concept.
...

All help appreciated :^)

Thanks,
Tom Hanaway
Boynton Beach, FL
I had the same problem, using the actual avionics, you can see that they all have different amounts of bezel sticking out of the panel. Sometimes that is good, depending on your installation (like for shadowing,finger guarding, etc.) and the vertical arrangement of the avionics.
In general, for ROUGH fitting, make all the LOWER lips of the individual trays approximately even with the forward edge of your panel (the side away from the cockpit).
Then I would agree with the other post that suggested using a piece of scrap angle to fix the trays together as one piece, for rough fitting. When you finally get your boxes, you can make the final tweaks.
If you have a tip-up, watch out for your canopy frame swinging in to hit the upper-most grounding bar or d-sub connector. This will stick out behind (forward of) your tray. You may need to bring your top box down or aft to avoid interference.
If you have a garmin audio panel, it is not as deep as the rest of your stack, and the forward facing connectors will be the farthest away from the canopy rail. Good choice for the top box.

Good luck.
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  #10  
Old 09-14-2009, 12:44 AM
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mark manda mark manda is offline
 
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Location: Riverside,Calyfornia
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Default side view



side view of our 7a.
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