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drfred(at)suddenlinkmail.
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 Posted: Mon Sep 17, 2007 7:53 am Post subject: GPS antennae |
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Other than the "unsightly wart" appearance, how much drag is there in a
GPS antennae on the top back of the canopy? Is there a measurable
speed difference?
Fred Williams
40515
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rvbuilder(at)sausen.net
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| Posted: Mon Sep 17, 2007 11:33 am Post subject: GPS antennae |
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That's the money question and the answer is probably well less than a knot depending on where it goes. It's more likely to cause problems from buildup in icing conditions or p-static signal degradation than have any real impact to performance. I think most people are more interested in the clean lines that an antenna free surface provides.
Dan had the most important point that I completely forgot to mention. Paint type and water are the two biggest things that will attenuate a signal, especially at those frequencies. You guys with satellite TV, how good does that work when you get the big buildups outside. The fast glass guys bury everything they can inside the fiberglass shell. How many antennas do you see sticking out of a LongEZ, Cozy, or similar plans built glass? Granted I probably would be more leery using one of those in hard IFR. Ever see what happens to glass aircraft without protection when hit by lightning, not pretty but I digress.
Do the research, look at your mission profile, read all the facts and comments, and make your own decisions. The data exist for and against such configurations.
Michael
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AV8ORJWC
Joined: 13 Jul 2006
Posts: 1149
Location: Aurora, Oregon "Home of VANS"
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| Posted: Mon Sep 17, 2007 2:19 pm Post subject: GPS antennae |
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Mathematically measurable using the formula found in the AC43.13.
Insignificant in the grand scheme of ROP/LOP operations.
John W. Cox 40600
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drfred(at)suddenlinkmail.
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| Posted: Mon Sep 17, 2007 7:47 pm Post subject: GPS antennae |
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You did that just to make me open AC 43.13, didn't you.........
Dr Fred.
John W. Cox wrote:
[quote]
Mathematically measurable using the formula found in the AC43.13.
Insignificant in the grand scheme of ROP/LOP operations.
John W. Cox 40600
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AV8ORJWC
Joined: 13 Jul 2006
Posts: 1149
Location: Aurora, Oregon "Home of VANS"
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| Posted: Tue Sep 18, 2007 8:18 am Post subject: GPS antennae |
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Pages 708-710 on the electronic copy.
AC 43.13-2A Chapter 3, Antenna Installations, Paragraphs 36-38 which is
in the archives as well.
D= Drag
A= Area (frontal area of the antenna)
V= Velocity (which for Deems will be higher)
The resultant is listed as drag in pounds.
D=.000327 * A * V(squared)
Most manufacturers will give you the area calculation.
John Cox
40600
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