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  #1  
Old 09-10-2018, 08:00 PM
whd721 whd721 is offline
 
Join Date: Oct 2007
Location: Beaverton, OR
Posts: 220
Default RV9a VOR/ILS Antenna location

Does anyone have have any Photos or installation guidance on the installation of a Comant CI-157P antenna on an RV9A?
Where, how and advice.

Thanks
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whd721
RV9A
Sherwood, Oregon
As Bill Stout (designer of the Ford Trimotor) used to say, “Simplicate and add Lightness”
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  #2  
Old 10-10-2018, 08:25 AM
BMW_X6M BMW_X6M is offline
 
Join Date: May 2012
Location: Los Angeles Coast
Posts: 44
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I have the Bob Archer in the right wingtip. It has great reception of both VOR’s and ILS transmissions. It is easy to install.
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  #3  
Old 10-10-2018, 09:00 AM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 1,732
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Friends don't let friends stick ugly VOR antennas on their nice RVs. Put it in the wingtip. Either buy the Archer antenna or build your own.

My wingtip antenna picks up VORs at 100nmi and the ILS out beyond practical usefulness.

Carl
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  #4  
Old 10-10-2018, 10:02 AM
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airguy airguy is offline
 
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 4,321
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Same here - built my own Archer-style (one in each wingtip so I have a backup - they weigh nothing) and the reception is excellent on both VOR's and ILS.
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Greg Niehues - VAF 2018 dues paid
Garden City, TX
N16GN flying! http://websites.expercraft.com/airguy/
Built an off-plan 9A with too much fuel and too much HP. Should drop dead any minute now.
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  #5  
Old 10-10-2018, 11:01 AM
lr172 lr172 is offline
 
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 3,280
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I have one (archer wing tip) that I am about to sell, so PM me if you go this way.

Larry
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RV-6A / IO-320, Flying as of 8/2015
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  #6  
Old 10-10-2018, 04:30 PM
dcl dcl is offline
 
Join Date: Mar 2012
Location: UK
Posts: 24
Default VOR/ILS/COM

Are these the two antennas for the wingtips ? I think 1 is com and 1 is VOR/ILS


https://www.aircraftspruce.com/catal...r_antenna1.php
https://www.aircraftspruce.com/catal..._antenna-1.php


David
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RV9A under construction
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  #7  
Old 10-10-2018, 04:42 PM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 4,520
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Quote:
Originally Posted by dcl View Post
Are these the two antennas for the wingtips ? I think 1 is com and 1 is VOR/ILS


https://www.aircraftspruce.com/catal...r_antenna1.php
https://www.aircraftspruce.com/catal..._antenna-1.php


David
Yes, the VOR/ILS is mounted horizontally and the com vertically. No personal experience with the COM, but IIRC, it is not stellar. The VOR/ILS is excellent.
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RV-7
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Last edited by BillL : 10-10-2018 at 05:03 PM.
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  #8  
Old 10-10-2018, 04:44 PM
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rolivi rolivi is offline
 
Join Date: Feb 2015
Location: Fort Worth
Posts: 477
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I think if you search this site for Archer you'll find that the NAV gets generally positive reports but the COM does not.

For that reason I use belly whips for my COMs and the Archer for my NAV.

YMMV.
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RV-6A (Purchased)
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Last edited by rolivi : 10-10-2018 at 04:44 PM. Reason: spelling
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  #9  
Old 10-21-2018, 08:38 PM
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gmcjetpilot gmcjetpilot is offline
 
Join Date: Jan 2005
Posts: 3,696
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With an A model your tail is high. I like putting a di-pole twin whiskers on top of rudder under tip fairing. This is a great location and drag increase is tiny (fraction of a mph). The thin metal rods are not noticeable. Performance for VOR, LOC, GS I think will be better than the wing tip antenna.

The other place is under the horizontal tail on the belly. The Horizontal stab covers it so it's less obvious. You have to be careful not to poke your eye if crawling around under tail say for tie down. I had my RV-4 under belly/horz stab. It worked great. xxxx = VOR/LOC/GS antenna. (you can get a split-coupler to do all three). See links. No offense to internal wing tip antenna but it's a huge compromise. I suppose it is academic with GPS but for such little penalty in drag the standard dipole out in breeze is going to give better performance.

https://goo.gl/images/XKiWEp
https://goo.gl/images/pwmfds

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......................./xxxx|
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......................xxxxx

https://goo.gl/images/bCRRSs
https://goo.gl/images/Q4q9Hd
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Raleigh, NC Area
RV-4, RV-7, ATP, CFII, MEI, 737/757/767

Last edited by gmcjetpilot : 10-21-2018 at 08:55 PM.
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  #10  
Old 10-21-2018, 09:56 PM
whd721 whd721 is offline
 
Join Date: Oct 2007
Location: Beaverton, OR
Posts: 220
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Thanks to all that replied.

In the long gap between my original post and today, I had come to the same solution posted by gmcjetpilot above.

I now have a Comat 157p and plan to mount it on the rudder. I was pleased to find the current model has a hockey puck that is only about 1/4" thick. It should be nearly invisible way up there.

Thanks again.
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RV9A
Sherwood, Oregon
As Bill Stout (designer of the Ford Trimotor) used to say, “Simplicate and add Lightness”
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