tag:blogger.com,1999:blog-10000144.post7723716919686170975..comments2024-03-13T09:47:40.487+00:00Comments on Cockpit Conversation: Freezing or SwelteringAviatrixhttp://www.blogger.com/profile/13634111275860140084noreply@blogger.comBlogger11125tag:blogger.com,1999:blog-10000144.post-8087999254427550072009-11-16T05:17:33.034+00:002009-11-16T05:17:33.034+00:00...
"Freezing Fog": One of the things ......<br /><br />"Freezing Fog": One of the things that fell through the cracks when North American hourly observations were converted from the "SA" format to METAR. (Are you old enough to remember SAs??)<br /><br />In the original SA specification, you have "FOG" and "ICE FOG". <br /><br />FOG was distinct from "ICE FOG" in that FOG was water droplets... "ICE FOG" was ice crystals.<br /><br />Hence you knew that "ICE FOG" could never "freeze" onto your airframe, since it is already frozen. And you know that "FOG" at below-freezing temperatures was possibly dangerous, since it COULD accumulate on your airframe.<br /><br />Along come METARS with no code for "ICE FOG". Therefore, when the temperature is below freezing, whether you code FG or FZFG really implies the same thing, since FG technically means water droplets and hence the potential for freezing.<br /><br />SO.... for the sake of uniformity, (although NOT for the sake of useful information)... my understanding is that Canada will always code FZFG for fog in below-freezing temperatures... NO MATTER WHETHER IT IS LIQUID OR ICE-CRYSTALINE.<br /><br />The added remark "FROIN" (frost on indicator) ... or absence thereof... is supposed to be your clue as to whether this is "REALLY" freezing fog or not.<br /><br /><br />...Iceboundnoreply@blogger.comtag:blogger.com,1999:blog-10000144.post-17006750793115656212009-11-14T17:59:30.181+00:002009-11-14T17:59:30.181+00:00Computers and other equipment built with very high...Computers and other equipment built with very high speed logic (Emitter coupled Logic, or ECL, although sometimes called CML) are quite temperature sensitive.<br />Most logic circuits operate with the transistor either fully on, or fully off. Emitter Coupled logic operates with the transistors in the active region at all times, so they are never fully on or fully off. This makes them much faster. The bad news is ambient temperature impacts the characteristics of these devices, so if the temperature is outside the range, they may go to a fully on or fully off state, which makes the logic state changes much slower. <br /><br />The ECL logic is generally the fastest you can buy, but it isn't at all tolerant of substantial temperature excursions.<br /><br />By contrast the logic used in automotive engine control applications needs to be very tolerant of temperature excursions because it has to be able to start the engine when it is -30 outside, and still run when the temperature under the hood is above 100C.mattheww50https://www.blogger.com/profile/00898846687006155502noreply@blogger.comtag:blogger.com,1999:blog-10000144.post-19362661950274810162009-11-13T18:51:58.840+00:002009-11-13T18:51:58.840+00:00During the Blitz of London in WWII - Ravens were t...During the Blitz of London in WWII - Ravens were thought to possess powers of prescience regarding the arrival of German bomber aircraft . Any occurrence of agitated behaviour was taken seriously as a possible harbinger .Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-10000144.post-28597643478036807522009-11-13T13:55:43.161+00:002009-11-13T13:55:43.161+00:00Strange accident. I have no idea what happened, b...Strange accident. I have no idea what happened, but there's a discussion of it on the PPRUNE forum:<br /><br /><a href="http://www.pprune.org/african-aviation/395632-rj-crash-kigali.html" rel="nofollow">click here</a>Mattnoreply@blogger.comtag:blogger.com,1999:blog-10000144.post-27106136329594190622009-11-13T06:38:49.129+00:002009-11-13T06:38:49.129+00:00Computer components tend to heat up quickly. If t...Computer components tend to heat up quickly. If they start out in a very cold state, the quick rise in temp can cause problems with thermal expansion. (And there may be other concerns -- I'm just familiar with this one.) I've seen cracked packaging on CPUs used in cold test rooms, and other such deviltry.<br /><br />Worse is when the liquid crystal in an LCD freezes! [That's a joke.]dpiercehttps://www.blogger.com/profile/03397601206317363858noreply@blogger.comtag:blogger.com,1999:blog-10000144.post-46995283753026476272009-11-13T05:34:42.007+00:002009-11-13T05:34:42.007+00:00Yes, crows & ravens are quite smart. I've...Yes, <a href="http://www.youtube.com/watch?v=TtmLVP0HvDg" rel="nofollow">crows & ravens are quite smart</a>. I've heard amazing things about the social order and customs of the common crow. <br /><br />@rw2: <i>What kind of computers require warmth? Most of them prefer the cold.</i><br /><br />Maybe ... computers with rotating disk drives? Heads flying low above platters in colder than standard air might crash.Sarahhttps://www.blogger.com/profile/09991660841701835065noreply@blogger.comtag:blogger.com,1999:blog-10000144.post-28306931682210920222009-11-13T04:06:41.604+00:002009-11-13T04:06:41.604+00:00What kind of computers require warmth? Most of th...What kind of computers require warmth? Most of them prefer the cold.rw2https://www.blogger.com/profile/04478088244450124253noreply@blogger.comtag:blogger.com,1999:blog-10000144.post-26084403722385042222009-11-13T02:37:13.188+00:002009-11-13T02:37:13.188+00:00That accident report was odd...maybe they hit the ...That accident report was odd...maybe they hit the throttle by accident?nicnacjakhttps://www.blogger.com/profile/03084794984283390522noreply@blogger.comtag:blogger.com,1999:blog-10000144.post-67208461571558911492009-11-13T01:03:44.509+00:002009-11-13T01:03:44.509+00:00I can honestly say that I've never heard of so...I can honestly say that I've never heard of someone pouring water in their bra to cool off. Thats a new one for me. However, hats off to you for your ingenuity!CanuckFlyerhttps://www.blogger.com/profile/01742154354935197804noreply@blogger.comtag:blogger.com,1999:blog-10000144.post-58653783535308402222009-11-13T00:41:17.744+00:002009-11-13T00:41:17.744+00:00"... pour some of my drinking water into my b..."... pour some of my drinking water into my bra..."<br /><br />Well then it can truly be said that "your cup(s) runneth over!" ... hey - I had to say it before someone else did.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-10000144.post-90644258724423086812009-11-13T00:41:12.572+00:002009-11-13T00:41:12.572+00:00We were sitting inside a cafe one time, next to a ...We were sitting inside a cafe one time, next to a window and we could see the people sitting on benches outside. One guy got up off a bench and came inside to get something, leaving a muffin sitting on a plate on the bench. As soon as he was gone, a crow tried to grab the plate, knocking the muffin to the ground, where it tried to drag it farther away. The guy came back in a minute, then a minute later noticed his muffin was gone and started looking around. He finally noticed the remains on the ground, but by then the crow and a couple buddies had eaten most of it.Wardhttps://www.blogger.com/profile/10536621966257386711noreply@blogger.com