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- From: geoff@peck.com (Geoff Peck)
- Newsgroups: rec.aviation.piloting
- Subject: Re: Engine Failure Due to Cold Engine?
- Message-ID: <1993Jan26.061032.6856@peck.com>
- Date: 26 Jan 93 06:10:32 GMT
- References: <1993Jan19.044113.6485@netcom.com> <dkkaps5@Unify.Com> <C1EDEx.I8t@world.std.com>
- Organization: Geoffrey G. Peck, Consultant, San Jose CA
- Lines: 33
-
- In article <C1EDEx.I8t@world.std.com> paulc@world.std.com (Paul E Cantrell)
- writes:
- > Well, when I was at the Robinson factory CFI course, a guy from Alaska
- > asked Frank Robinson about that - seems they get something called ice
- > fog when it's really cold. Frank's from Southern California and couldn't
- > tell the guy what was the right thing to do in this situation, but the
- > guy clearly seemed to think that carb heat would make things worse.
-
- Ice fog is one of the most menacing things known to light aircraft. It's
- sort of like normal fog -- formed when the temperature/dewpoint spread is
- low -- and it tends to be only 10 or 20 feet thick. Ice fog typically
- forms at night (it's a type of ground fog), but if it gets very thick it
- may take much of the day to clear.
-
- When ice fog comes in contact with a moving aircraft, the aircraft tends
- to ice up instantaneously. The ice typically looks like a very heavy
- layer of frost. Not only is it impossible to see through the windows once
- this has happened, but a significant loss in lift and/or increase in stall
- speed may be encountered.
-
- One of the bizzare things about ice fog is that you may fly over an airport
- and it will look like it's perfectly fine VFR -- the runway lights are
- plainly visible from above. When one starts a descent for the field,
- things start to look a bit murky a few hundred feet up on final. When one
- lands, though, the visibility goes to zero or close to it, and moments
- thereafter, the windows ice over.
-
- Ice fog is dangerous. Very dangerous. Don't fly in it. And particularly
- don't take off in it. You may have de-frosted your aircraft properly on
- the ground, but as soon as you start that takeoff roll, the ice will begin
- to build. And you may just not clear those trees at the end of the runway.
-
- Geoff
-