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#21
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#22
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"Dave" wrote in message ink.net... | I'd like to know how you get in icing when the temperature is +5. I have | never seen ice until the the gauge reads 0 or below. Icing occurs when liquid water freezes on an airplane surface that is below freezing. The aircraft may have been cooled earlier when it flew through a layer. Per your next reply -- if you don't trust Peter R.'s gauge to say it is +3 when he is getting icing, what makes you think you can trust your gauge? |
#23
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"PaulaJay1" wrote in message ... | In article , Peter R. | writes: | | I brought it | home to calibrate it and found that it read 2 deg high at 25, 45, and 65 | deg. | | How did you calibrate your thermometer for 25 degrees? | | | I put it and two reference thermometers in the freezer part of the | refrigerator. I put them in the full freezer that is about 0 deg F and the | digital did not display. Digital displays usually fail in cold temperatures. There is nothing odd about that. |
#24
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"Andrew Sarangan" wrote in message om... The temperature above the wings and below the elevators could be slightly below ambient due to the lower pressure. I don't have a number on what the temperature drop is on these surfaces, but technically it is possible to have icing on the lifting surfaces when the ambient temperature is above freezing. Sort of like carb icing in above-freezing temperatures. There has been a lot of hypothisizing about this in the past but NOBODY has EVER been able to reproduce it. You don't get icing just because a portion of the airplane is below 0C. I doubt if droplets even touch any part of the airfoil where the temperature/preasure is below ambient without running back. If they run back, the first encountered the heated portion of the wing (leading edge). You need supercooled water to get airframe icing. It is another of aviations myths Mike MU-2 .. |
#25
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"Bob Gardner" wrote in message news:XKARb.132385$nt4.579289@attbi_s51... Any time air is accelerated, as it is when passing over a small-radius surface, its temperature drops...so it is entirely possible to accrete ice when the temp is above zero. first...OAT guage, struts, lower edge of windscreen where there is a lip rather than a flush surface, etc. That is also why tail feathers begin to accrete ice before the wing's leading edge does. Bob Gardner While small radius objects do collect ice better than larger redius objects, temperature drop has nothing to do with it. Small radius objects have a higher "collection efficiency" meaning more of the droplets in their path will impact the surface. They have a higher collection efficiency because they don't project a "bow wave" as far in front of them as larger. You NEED supercooled water for airframe icing. Mike MU-2 |
#26
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"C J Campbell" wrote in message ... "Dave" wrote in message ink.net... | I'd like to know how you get in icing when the temperature is +5. I have | never seen ice until the the gauge reads 0 or below. Icing occurs when liquid water freezes on an airplane surface that is below freezing. The aircraft may have been cooled earlier when it flew through a layer. Almost. Icing occurs when a below freezing aircraft encounters supercooled water. Supercooled water does not exist above 0C. Mike MU-2 |
#27
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This is not about frustration, but about trying to understanding how
FAA comes up with airmets. An airmet is supposed to be issued when moderate icing is expected. If they are issuing an airmet every time there are clouds and freezing temperatures (or even above freezing), then what about light icing? Unless your plane is certified for known icing then airmet or not any icing potential means you can't legally fly. Arguing over moderate versus light is academic since either is prohibitive.. The other crazy thing is people are arguing over 2 degrees F. I don't care how accurate your thermometer is, but if you are that close to potential icing, get out of there. +5 certainly gives you the margin and sure the FAA will err on the larger side but still, are you watching the OAT in your instrument scan....."one more degree drop and I turn around....." Crazy. Gerald |
#28
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Gerald Sylvester ) wrote:
are you watching the OAT in your instrument scan....."one more degree drop and I turn around....." Crazy. LOL! -- Peter ----== Posted via Newsfeed.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeed.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= 19 East/West-Coast Specialized Servers - Total Privacy via Encryption =--- |
#30
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ArtP wrote in message . ..
On 27 Jan 2004 17:05:49 -0800, (Andrew Sarangan) wrote: This is not about frustration, but about trying to understanding how FAA comes up with airmets. An airmet is supposed to be issued when moderate icing is expected. If they are issuing an airmet every time there are clouds and freezing temperatures (or even above freezing), then what about light icing? Unless your plane is certified for known icing then airmet or not any icing potential means you can't legally fly. Arguing over moderate versus light is academic since either is prohibitive.. But what if the airplane were certified for known ice? Would it not matter then? |
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