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bo124rs(at)hotmail.com
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 Posted: Wed Jan 03, 2007 4:21 am Post subject: GPS Antenna Under Cowl now heat chart |
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| Quote: | From: Charlie England <ceengland(at)bellsouth.net>
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| Quote: | Just out of curiosity, what color is the antenna? If it's black (or any
dark color) & under a closed canopy, it could easily approach 200 degrees
on a sunny day...
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Nor even considering the greenhouse effect of the canopy here is an old
chart from my prior building days. Interesting here is the difference
between red and black, lots of red RV's................hum:-)
http://kr.flyboybob.com/images/kr2/kr2plans-drwg90.jpg
Dana Overall
Richmond, KY i39
RV-7 slider, Imron black, "Black Magic"
O 360 A1A, C/S C2YK-1BF/F7666A4
http://rvflying.tripod.com/blackwing1.jpg
http://rvflying.tripod.com
do not archive
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ktlkrn(at)cox.net
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| Posted: Thu Jan 04, 2007 7:53 am Post subject: GPS Antenna Under Cowl now heat chart |
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Since I live in probably the hottest climate in the US I feel I have a little experience is this area. Let me relate a couple of things. One, in my law enforcement career I had the unfortunate opportunity to supervise the investigation of the death of a child that was accidentally left in a car in the summer time. In one case, we simulated the conditions the next day, same time, OAT was within a degree, humitidy level the same. The OAT was 112 degrees. The temperature inside the Chevy Tahoe was 166 degrees.
I guess temps above this are possible but not to likely. Vehicle type, color, roof type are all variables.
I believe the Sun itself is far more detrimental to the equipment than the heat. UV rays are present regardless of the temperature. In the Sun a Chrome finish can be hot to the touch in 70 degree heat. So, you mount your GPS antenna under the bubble somewhere, exposed to the sky, it is still getting the UV rays and the components are getting heat from the sun and collecting that heat.
Armed with this knowledge, I mounted my GPS and XM antennas on a plate just in front of the firewall and near the top of the cowl. Here, they never get direct sunlight and have constant air movement when the plane is in motion. When parked at an airshow or fly in I usually keep oil door unlatched for a few minutes after shutdown. Also when flying at altitude the air in the cowl is not very hot. Meanwhile the bubble mounted antenna has the Sun on it.
Unofficially, I spoke to a person who works in the customer support area of a large Avionics company. He said the under the cowl is probably one of the safest places to mount the antenna. There is it protected from the sun and moisture. He said it should never be mounted in the open as the moisture is the biggest killer of GPS antennas.
DArwin N. Barrie
Chandler AZ
RV7 N717EE
[quote][b]
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