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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 25704
Location: Livermore CA USA
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 Posted: Sat May 09, 2009 9:49 am Post subject: Mounting Antennas On Bottom Fuselage Skin... |
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Fellow Builders,
I'm getting ready to mount the COM (Commant bent whips) and Transponder (Commant shark fin) antennas on the bottom of the RV-8. I plan to mount them to the bottom fuselage skin right behind the aileron torque tubes. I think this is something like .040" skin and its pretty rigid, but what are people's thoughts on adding a skin doubler, perhaps a .032 piece something like 6"x8"? I'd rather not, but on the other hand, I don't want to have the skin end up deformed over time.
Thanks in advance.
Matt Dralle
RV-8 #82882 N998RV
Laying Out Carpet in CAD...
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jim-bean(at)att.net
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| Posted: Sat May 09, 2009 10:51 am Post subject: Mounting Antennas On Bottom Fuselage Skin... |
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carl.froehlich(at)verizon
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| Posted: Sat May 09, 2009 11:12 am Post subject: Mounting Antennas On Bottom Fuselage Skin... |
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I believe the skin is 0.032" not 0.040".
Recommend using a 0.032' doubler. 6"x8" is larger than needed however.
Consider something that extends and inch or two beyond the antenna mounting
screws. A simple install is a little bit of pro-seal between the doubler
and the skin, and then the antenna hardware through both the skin and the
doubler. Don't be concerned that you do not have perfect metal to metal
connection. The antenna needs an RF ground, not a DC ground. As long as it
is mounted on the skin you are ok, even if you have primer/paint on the
skin.
Put some spacing between the two antennas, perhaps a couple of feet.
Carl Froehlich
RV-8A (475 hrs)
RV-10 (fuselage)
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rv8builder
Joined: 02 Jan 2009
Posts: 56
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| Posted: Sat May 09, 2009 6:24 pm Post subject: Mounting Antennas On Bottom Fuselage Skin... |
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In my crude survey of other builders, I discovered that 2/3 or more of builders do put a doubler plate on the inside of the bottom skin for at least the comm antenna. As you suggested, about a 6 x 8 inch piece of .032 material. But I suspect that a 6 x 6 piece would work, if that is what you happen to have laying around.
I have seen that doubler riveted with both countersunk and universal head rivets.
Dale
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vshimsl(at)live.com
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| Posted: Sat May 09, 2009 6:41 pm Post subject: Mounting Antennas On Bottom Fuselage Skin... |
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Used same antennae C same location except transponder was near rear bellcrank. Both areas I used a doubler.
Vince H.
RV-8 N8432
Preparing for inspection.
Windows Live™: Keep your life in sync. Check it out. [quote][b]
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madman266(at)comcast.net
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| Posted: Sat May 09, 2009 7:39 pm Post subject: Mounting Antennas On Bottom Fuselage Skin... |
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if you bend up 1/4 in on each side, the stiffener will be more stiff .. j
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