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  #1  
Old 03-18-2018, 03:26 AM
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goatflieg goatflieg is offline
 
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Location: Clarkston, MI
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Default GPS Antenna on RV-8 glareshield? Photos wanted.

It was suggested to me by Jason at Aerotronics that the best compromise location for my GPS puck antenna would be on the glareshield of my RV-8. I've done some preliminary layout work, but the problem is that I don't know exactly where the windscreen will lay on the forward top skin. I've viewed other builder websites, and that's given me some clues... but I won't be cutting my own canopy for quite a while. I'd like to finish the metal work on the forward top skin soon so I can get it painted, but I don't want to drill holes for the puck or the ventilation fans that will flank it until I can be sure the layout will work with the possible windscreen placement. If any other builders have done it this way and can share photos with me, I'd be grateful for the input.
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Clarkston, MI
RV-8 #83507 - empennage complete (except fiberglass)
QB wings & fuselage work continues
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Old 03-18-2018, 03:30 AM
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This is my current layout. The GPS is top dead center; the fans are as close as practical, and clearance from the instrument panel flange has been taken into consideration.
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Martin J Filiatrault
Clarkston, MI
RV-8 #83507 - empennage complete (except fiberglass)
QB wings & fuselage work continues
N657AR reserved
Builder websites:
http://goatflieg.blogspot.com/
http://www.mykitlog.com/goatflieg/
YouTube Channel:
https://www.youtube.com/user/goatflieg
Dues paid for 2018... extra payment included for psychological therapeutic services rendered.

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Old 03-18-2018, 05:54 AM
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mike newall mike newall is offline
 
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Slightly related and a cautionary tale.

If you use a remote GPS antenna for say a G695/795 etc, be careful where you locate it because....... They have a magnetic base !

Ask us how we found out on our RV7

So we now subtract 32° from our standby compass - it is easy, honestly !
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Old 03-18-2018, 06:41 AM
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Mark Dickens Mark Dickens is offline
 
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Mine is located under the cowling so can't help with your specific question, but be aware that some GPS manufacturers require a minimum decibel loss (usually caused by the length of coax between the receiver and the antenna) in the coax. Mounting it on the glare shield will require you to engineer that into the installation.
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Old 03-18-2018, 07:45 AM
rockbottom rockbottom is offline
 
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Martin,
Have you planned your panel yet? I have a Garmin GMC307 autoflight unit and some annunciator lights located top center of my panel that project into the area where your fans and GPS antenna coax will be. Like Mark, I placed one GPS antenna puck under the cowl on a shelf and another is mounted on a small fabricated platform attached to the turtleback behind the passenger's seat. I'm not flying yet, so I can't say how well my setup will work. Also, while I don't know how much actual interference could result (if any), depending on what avionics you intend to install, some devices may restrict proximity to a fan motor. The installation manual for my GTN650 mentions it, but I don't recall any specific distance requirements.

J. Baker
RV8 Finishing
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Old 03-18-2018, 08:33 AM
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Put mine on the glare shield. Worked fine but covered it with a black tape (instead of flat paint) so it wouldn’t glare on the windscreen. I think I located it after the windscreen was in place.
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  #7  
Old 03-18-2018, 08:41 AM
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Carl Froehlich Carl Froehlich is online now
 
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Some comments on your layout:
- For the RV-8, one fan is more than enough and perhaps half the size of what you showing. Put it in the middle.
- Most installs end up with two GPS antennas (e.g. the Dynon 2020 and the Garmin). Put one on each side of the fan equally spaced between the fan and the side of the glaresheild.
- Move everything a little further forward, more like the mid point between the panel and the next bulkhead. Where you have them will cause unnecessary interference with some EFIS and such installs.
- Cover the white antennas with some dark gray or black cloth to eliminate glare. Do not paint.
- Suggestion, for the fan just drill a pattern of holes for the air to go thru, don’t cut a square hole then cover it with a cheap looking grill. The air will go thru just fine.

I built two airplance with both GPS antennas on the glareshield. They both worked perfectly.

Carl
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Old 03-18-2018, 12:07 PM
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goatflieg goatflieg is offline
 
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To address some comments:
Aerotronics built my panel; Jason knows the layout and approves of the antenna placement and cable length... but I'll check with him about the fan placement.
My panel only requires one GPS antenna and has no standby compass. I got two free fans from Leo Knowlden, so I was going for symmetry there. I do like the thought of using smaller fans, though.
The Garmin puck antenna has "Do Not Paint" marked clearly on top of it, but I've heard otherwise from other experts, so I called Garmin and asked them. They said a thin layer of flat black paint should be fine as long as it's not metallic. They are not aware of any adverse chemical/material issues. Champ, if you have any photos, please share. My main concern is just not knowing how much glare shield space I'll have to work with.
Thanks for the input.
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Martin J Filiatrault
Clarkston, MI
RV-8 #83507 - empennage complete (except fiberglass)
QB wings & fuselage work continues
N657AR reserved
Builder websites:
http://goatflieg.blogspot.com/
http://www.mykitlog.com/goatflieg/
YouTube Channel:
https://www.youtube.com/user/goatflieg
Dues paid for 2018... extra payment included for psychological therapeutic services rendered.

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Old 03-18-2018, 12:25 PM
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Quote:
Originally Posted by goatflieg View Post
It was suggested to me by Jason at Aerotronics that the best compromise location for my GPS puck antenna would be on the glareshield of my RV-8.
Although Aerotronics suggested the glareshield, another option is the turtledeck, under the canopy. See this pic of my previous RV-8:

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  #10  
Old 03-18-2018, 12:29 PM
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goatflieg goatflieg is offline
 
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Quote:
Originally Posted by RV8JD View Post
Although Aerotronics suggested the glareshield, another option is the turtledeck, under the canopy. See this pic of my previous RV-8:

Wow! That photo would make good ad copy for Garmin!
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Martin J Filiatrault
Clarkston, MI
RV-8 #83507 - empennage complete (except fiberglass)
QB wings & fuselage work continues
N657AR reserved
Builder websites:
http://goatflieg.blogspot.com/
http://www.mykitlog.com/goatflieg/
YouTube Channel:
https://www.youtube.com/user/goatflieg
Dues paid for 2018... extra payment included for psychological therapeutic services rendered.

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