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  #1  
Old 10-16-2017, 01:23 PM
JDA_BTR JDA_BTR is offline
 
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Default Nav antenna on belly of plane

I have an extra hole in my kit because I donít need a separate Adsb in antenna. One is at the tail of a trigear configuration. The other option is under the baggage compartment. If I use one for the transponder can I use the ither for a nav antenna? I was planning a wingtip nav antenna but maybe I donít need it now?
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  #2  
Old 10-16-2017, 01:42 PM
Canadian_JOY Canadian_JOY is offline
 
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S E A R C H is your friend. There are lots of conversations on this forum regarding use of a "cat whisker" style of NAV antenna under the tail.
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  #3  
Old 10-16-2017, 01:43 PM
JDA_BTR JDA_BTR is offline
 
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Thanks I did search and find that plenty of people put those in but not much info in whatbthe trade offs are.
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Last edited by JDA_BTR : 10-16-2017 at 01:45 PM.
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  #4  
Old 10-16-2017, 02:17 PM
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Carl Froehlich Carl Froehlich is online now
 
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A wingtip VOR antenna does everything you need. A belly mounted VOR antenna will be functional as well - but is ugly and an unnecessary eye hazard. If you must put it on the belly, please take the time to add eyeball protectors on it every time you park the plane. While you may know these pointy eye pierces are there, kids and dogs will not. You might also forget one day when cleaning the belly and sit up. An eye patch is not as attractive as the movies make them out.

Yes - I do add sleeves to my belly comm antennas for the same reasons.

Carl
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  #5  
Old 10-16-2017, 07:03 PM
JDA_BTR JDA_BTR is offline
 
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Good advice on the eye hazard hadnít thought of that. Well Iíve got a perfectly good hole on the bottom of my plane. Wonder what the best way is to cover the holes.
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  #6  
Old 10-16-2017, 08:09 PM
gasman gasman is offline
 
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Quote:
Originally Posted by JDA_BTR View Post
Good advice on the eye hazard hadnít thought of that. Well Iíve got a perfectly good hole on the bottom of my plane. Wonder what the best way is to cover the holes.
The best way is to cut a plug... same thickness as belly skin. Make it a good fit. Make a backing plate to cover the hole plus enough to rivet to the skin.

C/S all rivets. Rivet the backing plate in place. And then rivet the patch in place.

That is an Air Force approved patch.

Or you could cut a patch to cover the hole plus some room for rivets, taper the edge and rivet it on........ this will cause drag and the other won't.
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  #7  
Old 10-16-2017, 08:18 PM
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Carl Froehlich Carl Froehlich is online now
 
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Quote:
Originally Posted by JDA_BTR View Post
SNIP Well Iíve got a perfectly good hole on the bottom of my plane. Wonder what the best way is to cover the holes.
Option #1 (the easy one), install an ADSB blade antenna anyway. You will most likely install one at some point, so do it now.

Option #2, put a couple of bids of fiberglass on the inside over the hole. Let it set up. Add micro on the outside to fill in the hole now that you have the cured glass on the inside as a backing plate. Sand the micro, repeat if needed. Prime and paint.

Carl
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  #8  
Old 10-17-2017, 10:29 AM
JDA_BTR JDA_BTR is offline
 
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Might be fun to install an aprs antenna. Will look into that not sure if a stock com antenna will do.
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  #9  
Old 10-17-2017, 11:58 AM
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Sam Buchanan Sam Buchanan is offline
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Quote:
Originally Posted by JDA_BTR View Post
Might be fun to install an aprs antenna. Will look into that not sure if a stock com antenna will do.
A COM antenna is a little too short for optimum APRS performance, but it would work as long as the SWR wasn't high enough to damage the tracker.

I would fabricate a patch as detailed in posts above but secure it with countersunk screws so it can be removed easily in case you find you need another antenna.
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