Charliejag1 From United States of America, joined Aug 2006, 238 posts, RR: 0 Reply 4, posted (6 years 4 months 1 day 16 hours ago) and read 2990 times:
I think its probably condensation, but what about blown flaps? Do the russians use them at all?
Bleed air taken from the engines and "blown" over the underside of the wing and trailing edge flaps, therefore increasing airflow over the flaps and creating more lift. I'm sure someone can elaborate more, as I'm not an expert on exactly how they work.
Most of the blown flap mechanisms that I have read about actually blow air across the top of the wing surface and flaps. The Coanda effect causes the air to "stick" to the upper contours of the wing and flap. When the air is blown across a deflected flap, it will be vectored downwards. This makes additional lift.
I might be wrong, but I thought "blown flaps", at least as seen on the C-17, were simply flaps that are extended down behind the engines - into the exhaust stream. They thereby exert a downward force on the jet exhaust, and create more lift.
Corrections welcome
~Vik
"Two and a Half Men" was filmed in front of a live ostrich.
474218 From United States of America, joined Oct 2005, 6340 posts, RR: 9 Reply 12, posted (6 years 4 months 23 hours ago) and read 2595 times:
I agree that it is condensation, but why do you think its landing? The flaps appear to be only about a third to half way extended, which would suggest takeoff.
David L From United Kingdom, joined May 1999, 9216 posts, RR: 42 Reply 13, posted (6 years 4 months 21 hours ago) and read 2558 times:
Quoting 474218 (Reply 12): why do you think its landing? The flaps appear to be only about a third to half way extended, which would suggest takeoff.
I was hoping someone else would ask that! Two clues I can think of are the flap position and the attitude but I don't see those as necessarily indicating a landing. But, if it's landing, why are the trails in question extending down and back, even some way behind the aircraft?
Airfoilsguy From , joined Dec 1969, posts, RR: Reply 14, posted (6 years 4 months 19 hours ago) and read 2508 times:
My guess is take off. Otherwise the photographer took a pic of it landing then waited for everyone to deplane, fuel up, new passenger boarding, and push back in order take a pic of push back.
A342 From Germany, joined Jul 2005, 4655 posts, RR: 4 Reply 16, posted (6 years 4 months 18 hours ago) and read 2475 times:
As one can see when looking at the left FTF (seen from behind the aircraft), that stuff is coming from the upper side of the wing, not out of the FTF. So I don't think it's fuel.
Quoting Vikkyvik (Reply 11): I might be wrong, but I thought "blown flaps", at least as seen on the C-17, were simply flaps that are extended down behind the engines - into the exhaust stream.
MidEx216 From United States of America, joined Jun 2005, 651 posts, RR: 4 Reply 18, posted (6 years 4 months 17 hours ago) and read 2433 times:
Quoting Airfoilsguy (Reply 14): Otherwise the photographer took a pic of it landing then waited for everyone to deplane, fuel up, new passenger boarding, and push back in order take a pic of push back.
Those two pictures, though taken of the same airplane at the same airport on the same day, were not taken by the same person. So, chances are one person took a picture of it it's arrival, and then the other took a picture of it about an hour later pushing back for departure..
Airfoilsguy From , joined Dec 1969, posts, RR: Reply 19, posted (6 years 4 months 15 hours ago) and read 2388 times:
Quoting MidEx216 (Reply 18): Those two pictures, though taken of the same airplane at the same airport on the same day, were not taken by the same person
Yes, you are correct. Improper use of the search function on my part.
One is internally blown flaps, where the bleed air is channelled through the wing and then vented out the back. I have a feeling that this was really only common on fighters, with a centrally-mounted engine like the F-104.
The other is externally blown flaps, which Vik was describing. Interestingly, the A380 uses this concept.
By the way - check out the stall speed on this thing;
MidEx216 From United States of America, joined Jun 2005, 651 posts, RR: 4 Reply 23, posted (6 years 3 months 4 weeks 1 day 14 hours ago) and read 2126 times:
Quoting BAe146QT (Reply 21): I've always loved the Coaler. I don't know why, but there is something really aesthetically pleasing about it to me.
Yeah, that, and I've been taking a liking to the Tu-154. Don't ask why, but those are the only two Russian commercial jets that I really like.
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