|Quoting LeanOfPeak (Reply 7):|
The airplane needs to take off and land in a certain amount of runway. If the wing were sized to allow this without high-lift devices, cruise speed would be very low.
|Quoting Pilotpip (Reply 2):|
I don't remember the exact speed, but the UA 232 crash demonstrated how much those devices are needed. The touchdown speed on that aircraft was something like 290 knots and it was nearly at stall. None of the leading edge devices or flaps were deployed as a result of the hydraulic failure after the fan severed all three lines.
|Quoting AirWillie6475 (Reply 11):|
Flaps are used to increase the rate of descent without an increase in speed.
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