Bryan Becker From United States of America, joined Mar 2001, 333 posts, RR: 0 Posted (14 years 3 months 2 days 9 hours ago) and read 1445 times:
i was wondering what happens when you retract the flapes.When I went to CT last summer we took off from Phoenix,a little later it felt like we dropped a little bit,is that because they retracted the flaps,i was not looking out the window at that time.Does the plane drop when they retract the flapes.Or what does it do?A picture of a 747 retracting it's flaps got me thinkin
Latechpilot From United States of America, joined Jun 2005, 0 posts, RR: 0
Reply 2, posted (14 years 3 months 2 days 8 hours ago) and read 1400 times:
The sensation of "falling" could have just been the fact that the aircraft is accelerating because the flaps have been retracted. Flaps, when extended, change the camber of the airfoil, making it produce more lift. The more lift an airfoil produces, the more drag. When the flaps are retracted, the airfoil produces less lift. Iain is correct in saying that if the flaps are retracted without sufficient airspeed, a decrease in vertical speed may result. It is highly unlikely though that the aircraft will actually lose altitude or "drop."
Junior From Switzerland, joined Apr 2001, 43 posts, RR: 0
Reply 3, posted (14 years 3 months 7 hours ago) and read 1336 times:
On the Airbus A32x and A330, extending Flaps to position 2 creates an enormous pitch down and although being in a descend with 500 f/m vertical speed you may get an climb with up to 500'/m for a short time. When retracting the flaps from 2 to 1 after T/O the influence is not that strong but still noticeable. You have to push the nose a bit down to compensate for the pitch-up moment, which might give you the feeling af descending a bit.
(there is no degree indication with the flap settings as with other aircraft, because every position (1,1+F,2,3,Full) corresponds to a different amount of flaps on the 4 aircraft.
e.g.: Flaps 2 / Full