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khorton01(at)rogers.com
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 Posted: Sat Jun 30, 2007 10:42 am Post subject: Comant CI 122 Com antenna installation instructions? |
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I'm reviewing the installation of my Comant CI 122 VHF Com antenna,
to see whether I really need a doubler for that antenna or not. I
can't find any installation instructions, other than the generic
instructions they have on the web:
http://www.comant.com/pdfs/AntennaInstall.pdf
CI 122 info:
http://www.comant.com/pdfs/[ci%20122]5-05.pdf
Should I have received installation instructions that were specific
to that antenna model, or are the generic instructions all there is?
If anyone has specific installation instructions for that model, I'd
appreciate learning what they have to say about a doubler.
The antenna is mounted on the bottom of my not yet flying RV-8, under
the front seat, just behind the front spar over at the left side of
the fuselage. The skin is 0.032" thick at that location. My
original installation simply had platenuts riveted to the inside of
the skin to take the four mounting screws, but now I am leaning
towards installing an 0.032" doubler. I have a hard time believing I
really need a doubler for structural reasons, but it will be a lot
easier to install one now than it would be to deal with a skin crack
later.
If people have many hours in service of a similar antenna on 0.032"
skin without a doubler, I would appreciate learning about your
experience.
Kevin Horton RV-8 (finishing kit)
Ottawa, Canada
http://www.kilohotel.com/rv8
do not archive
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neal.george(at)mchsi.com
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| Posted: Sat Jun 30, 2007 12:21 pm Post subject: Comant CI 122 Com antenna installation instructions? |
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Kevin -
I bought two of those antennas new from Stein. I don't recall finding any
instructions in the boxes. I made doublers (0.032 if memory serves) about
3/4" bigger than the antenna base. Mine are mounted in the cabin floor,
just aft of the spar box, one in each outboard bay.
Neal
RV-7 N8ZG
Cowling
+++++++++++++++++
Kevin Horton
Sent: Saturday, June 30, 2007 1:40 PM
I'm reviewing the installation of my Comant CI 122 VHF Com antenna, to see
whether I really need a doubler for that antenna or not. I can't find any
installation instructions, other than the generic instructions they have on
the web:
http://www.comant.com/pdfs/AntennaInstall.pdf
CI 122 info:
http://www.comant.com/pdfs/[ci%20122]5-05.pdf
Should I have received installation instructions that were specific
to that antenna model, or are the generic instructions all there is?
If anyone has specific installation instructions for that model, I'd
appreciate learning what they have to say about a doubler.
The antenna is mounted on the bottom of my not yet flying RV-8, under the
front seat, just behind the front spar over at the left side of the
fuselage. The skin is 0.032" thick at that location. My original
installation simply had platenuts riveted to the inside of the skin to take
the four mounting screws, but now I am leaning towards installing an 0.032"
doubler. I have a hard time believing I really need a doubler for
structural reasons, but it will be a lot easier to install one now than it
would be to deal with a skin crack later.
If people have many hours in service of a similar antenna on 0.032"
skin without a doubler, I would appreciate learning about your experience.
Kevin Horton RV-8 (finishing kit)
Ottawa, Canada
http://www.kilohotel.com/rv8
do not archive
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recapen(at)earthlink.net
Guest
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| Posted: Sat Jun 30, 2007 2:02 pm Post subject: Comant CI 122 Com antenna installation instructions? |
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I just finished that exact evolution. Yes, I did use a doubler...yes, I did
prime it...yes, I cleaned off the screw through contact surfaces as well as
running a drill through the rivet holes to ensure bonding of the doubler
plate to the airframe/antenna.
There was an article in Sport Aviation a while back in addition to other
listers that I referred to as the necessity of the doubler plate
Zap me direct for pictures.
Ralph Capen
---
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