Today's Message Index:
----------------------
1. 05:58 PM - Re: ARTEX 406 ELT in a 7A (bcollinsmn)
2. 09:18 PM - 406 MHz ELT (DEAN PSIROPOULOS)
3. 10:10 PM - Re: 406 MHz ELT (Tom Gummo)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: ARTEX 406 ELT in a 7A |
So, umm, back to the original question. Does anyone have any images of their antenna
installation for this configuration. Just curious. Thanks.
--------
Bob Collins
St. Paul, Minn.
RV-7A (#&^ fiberglass!)
http://rvbuildershotline.com
Day job: http://minnesota.publicradio.org/collections/special/columns/news_cut/
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=215192#215192
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
Just in front of the vertical stab is still a very good location (mine is
about 18 inches forward of the vertical stab). Since the vertical
stabilizer is quite narrow and parallel to the antenna there will be very
little interference or reflection off of the leading edge. It's the folks
who have mounted the ELT antenna underneath the fiberglas tail intersection
fairing that are really limiting their usefulness. In that location the
antenna is mounted horizontally on the aft turtle deck bulkhead (RV-6/7/9)
projecting out into the 90 degree corner created by the intersection of the
vertical and horizontal stabilizers. That creates an excellent waveguide
effect, blocking the signal from reaching half of the area on the other side
of the aircraft.
Jerry, I understand the thinking about putting the antenna on the bottom and
it's another one of those multitude of "what if" scenarios that we RV
builders run through our heads so many times while we're building. I guess
to answer that somebody has to do some research on how many downed RVs have
ended up on their backs. I have heard of several but don't know just what
percentage of ALL RV accidents they actually make up. If you put it under
the wing and you stay right side up in a crash, you will be attenuating a
good bit of the signal and shortening the range at which you can be
detected. If you put it between the trailing edge of the wing and the
forward edge of the horizontal stab (top or bottom of fuselage) your range
should be quite good (right side up or upside down). Then you have to start
thinking about how to keep the antenna from being ripped off in the crash
(Tim Bryan's idea). And so the thought process goes... sometimes being a
safety analyst makes my brain hurt but, more food for thought.
Dean Psiropoulos
RV-6A N197DM
> -----Original Message-----
From: "Tim Bryan" <n616tb@btsapps.com>
Subject: RE: RV-List: 406 MHz ELT
I have my antenna mounted just in front of the vertical stabilizer. My
thinking was in a rollover the stabilizer *might* protect the antenna from
being smashed. Now I am wondering if the stabilizer causes any shielding of
the signal. Dean, any thoughts on that?
Tim Bryan
RV-6 Flying
N616TB over 100 hours now
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
Dean and all,
I would like to add one more thought about where to put the ELT antenna.
It shouldn't be what percentage land on their backs but ...
If the plane stay upright, there is a great chance that I am relatively OK,
and the ELT will be the least of my problems,
however, if the plane ends up on its back, then the crash was not controlled
and there will be a good chance that I am NOT OK.
And any help the ELT can be might make all the difference.
Of course, there is no good answer for crashing. And remember most things
on the ground are harder than your plane. :-(
Lets hope no one has need of their ELT.
GummiBear
Air Force Chief of Safety at Incirlik AB, Turkey (many years ago)
----- Original Message -----
From: "DEAN PSIROPOULOS" <dean.psiropoulos@verizon.net>
Sent: Wednesday, November 19, 2008 9:15 PM
Subject: RV-List: 406 MHz ELT
> <dean.psiropoulos@verizon.net>
>
> Just in front of the vertical stab is still a very good location (mine is
> about 18 inches forward of the vertical stab). Since the vertical
> stabilizer is quite narrow and parallel to the antenna there will be very
> little interference or reflection off of the leading edge. It's the folks
> who have mounted the ELT antenna underneath the fiberglas tail
> intersection
> fairing that are really limiting their usefulness. In that location the
> antenna is mounted horizontally on the aft turtle deck bulkhead (RV-6/7/9)
> projecting out into the 90 degree corner created by the intersection of
> the
> vertical and horizontal stabilizers. That creates an excellent waveguide
> effect, blocking the signal from reaching half of the area on the other
> side
> of the aircraft.
>
> Jerry, I understand the thinking about putting the antenna on the bottom
> and
> it's another one of those multitude of "what if" scenarios that we RV
> builders run through our heads so many times while we're building. I
> guess
> to answer that somebody has to do some research on how many downed RVs
> have
> ended up on their backs. I have heard of several but don't know just what
> percentage of ALL RV accidents they actually make up. If you put it under
> the wing and you stay right side up in a crash, you will be attenuating a
> good bit of the signal and shortening the range at which you can be
> detected. If you put it between the trailing edge of the wing and the
> forward edge of the horizontal stab (top or bottom of fuselage) your range
> should be quite good (right side up or upside down). Then you have to
> start
> thinking about how to keep the antenna from being ripped off in the crash
> (Tim Bryan's idea). And so the thought process goes... sometimes being a
> safety analyst makes my brain hurt but, more food for thought.
>
> Dean Psiropoulos
> RV-6A N197DM
>
>
>> -----Original Message-----
> From: "Tim Bryan" <n616tb@btsapps.com>
> Subject: RE: RV-List: 406 MHz ELT
>
> I have my antenna mounted just in front of the vertical stabilizer. My
> thinking was in a rollover the stabilizer *might* protect the antenna from
> being smashed. Now I am wondering if the stabilizer causes any shielding
> of
> the signal. Dean, any thoughts on that?
>
> Tim Bryan
> RV-6 Flying
> N616TB over 100 hours now
>
>
> __________ Information from ESET NOD32 Antivirus, version of virus
> signature database 3626 (20081119) __________
>
> The message was checked by ESET NOD32 Antivirus.
>
>
>
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|