Redcordes From United States, joined Jan 2006, 245 posts, RR: 0 Reply 4, posted (3 years 8 months 1 week 1 day 9 hours ago) and read 1462 times:
The higher the humidity the more prominent and lasting the contrails are. When the weather starts to change from clear and dry to warmer and moister, the contrails gradually become more and more noticeable -- usually a couple days in advance.
"The only source of knowledge is experience." A. Einstein "Science w/o religion is lame. Religion w/o science is blind."
SlamClick From United States, joined Nov 2003, 9996 posts, RR: 79 Reply 5, posted (3 years 8 months 1 week 1 day 9 hours ago) and read 1460 times:
No. They don't have enough torque to pull the skin off a pudding.
Seriously: When I flew them they were restricted to FL300 or below (think that's the number) and if conditions were right as to temperature and dewpoint at that altitude, they would just like any other airplane.
Get up into the arctic and I suppose a helicopter would pull one.
When I was a kid, whenever we saw a contrail it went from one horizon to the other. Years later I figured out why. They were recips we were looking at - jets were all military and rather rare. We were looking at B-29, B-36, B-50, C-124, C-97 and the airliners were Super Connies, B-377s and so forth. They would pull a con down in the mid to upper twenties where a jet might not because there was far more particulate matter in their exhaust, oil, soot, ring fuzz, bits of impeller seal, you name it.
Happiness is not seeing another trite Ste. Maarten photo all week long.
A319XFW From , joined Dec 1969, posts, RR: Reply 8, posted (3 years 8 months 1 week 1 day 9 hours ago) and read 1447 times:
Do 4 APU's cause contrails?
I was on an EZY flight last week and for the first time actually saw the contrails starting outside of my window when I looked back. Would have made a great pic, but I didn't have a camera with me.
That was at FL390.
SlamClick From United States, joined Nov 2003, 9996 posts, RR: 79 Reply 9, posted (3 years 8 months 1 week 1 day 8 hours ago) and read 1424 times:
Quoting 2H4 (Reply 6): did you 146 pilots actually refer to the airplane as the "Quadrapuff"?
Yes, and the quadraphonic leaf blower and the swineliner.
Because of the howling sound made by the flaps I called it "the hound of Hatfield" most of the time. After American tried stripping the paint off the ex-AirCal planes I referred to them as the "pewter pumpkin" because the skin would never buff out to anything like a shine.
But I did like flying the thing. It was slow, it didn't climb worth a damn and I guess they were expensive from a maintenance downtime standpoint but it was pleasant to fly.
The smallest jet I ever flew had four engines!
Happiness is not seeing another trite Ste. Maarten photo all week long.
Prebennorholm From Denmark, joined Mar 2000, 5126 posts, RR: 55 Reply 13, posted (3 years 8 months 1 week 9 hours ago) and read 1258 times:
When you burn one pound of fuel, then you always produce roughly 1.5 pound of water vapor.
It is only a question about temperature and relative humidity whether this produces contrails - condenses and freezes to ice crystals.
During this winter, which seems to never end, my car has produced a lot of contrails. The water vapor produced by the combustion condensed already within the cold exhaust tube.
Always keep your number of landings equal to your number of take-offs, Preben Norholm
Quoting Prebennorholm (Reply 13): When you burn one pound of fuel, then you always produce roughly 1.5 pound of water vapor.
Some contrail, usually short, is formed by the pressure reduction over the wings dropping the temperature below the dewpoint. When the air mixes and "warms" back up to ambient they dissipate.
Happiness is not seeing another trite Ste. Maarten photo all week long.
Brendan03 From Australia, joined Aug 2005, 812 posts, RR: 2 Reply 16, posted (3 years 8 months 6 days 16 hours ago) and read 1123 times:
Damnit! I saw a picture of an A310 taking off at some artic field somewhere and it was producing a massive contrail... I thought it was on Airbus's website but I may have been mistaken...
(Or It could have been shown in the making of the A380 video)
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