Flaps increase lift by...?

Question

Increase lift thus lowering the stalling speed by...

1) increasing the drag coefficient

2) increasing the wing surface area

Am I missing anything else?

Answer 1

Go back to the basics: Lowering flaps increases lift because it increases the path that air flows over the top of the wing versus the bottom of the wing.  The result is faster moving air (lower air pressure)  above the wing than below it.  As a result of this however, drag is increased and the aircraft slows down.  The chord length is increased.  Increasing drag is a result of lowering flaps, but lift is increased by increasing the wing area.  The question was, why do flaps increase lift - not what is the result.  

   That said; the beauty and intent of increasing flaps is that the drag slows you down for landing without losing lift.

     Flaps increase lift by increasing the wing surface area.

Answer 2

Both of what you said are true. They will increase the angle of attack.

Answer 3

"In general, the wings on most planes are designed to provide an appropriate amount of lift (along with minimal drag) while the plane is operating in its cruising mode (about 560 miles per hour, or 901 km per hour, for the Boeing 747-400). However, when these airplanes are taking off or landing, their speeds can be reduced to less than 200 miles per hour (322 kph). This dramatic change in the wing's working conditions means that a different airfoil shape would probably better serve the aircraft.

To accommodate both flight regimes (fast and high as well as slow and low), airplane wings have moveable sections called flaps. During takeoff and landing, the flaps are extended rearward and downward from the trailing edge of the wings. This effectively alters the shape of the wing, allowing the wing to turn more air, and thus create more lift. The downside of this alteration is that the drag on the wings also increases, so the flaps are put away for the rest of the flight.

"

This ^^ seems to give fairly good idea of how flaps work.. Im sorry though I wouldn't be able to help you with whether you have missed/forgotten anything...

Answer 4

I guess #1 should be "increasing the LIFT coefficient".

You didnt miss much, the CL is increased due to the change in camber.

As for #2, it need not always be true. Not all flaps increase wing area.

Answer 5

It also changes the angle of attack

Answer 6

Gives the aircraft extra lift. The purpose is to reduce landing speed, thereby shorting the lenght of the landing rollout. They also facilitate landing in small or obstructed areas by permitting the gliding angle to be increased without greatly increasing the approach. the use of flaps during takeoff serves to reduce the length of the takeoff run. Some flaps are hinged to the lower trailing edges of the wings inboard of the ailerons. Leading edge flaps were used on the Navy F4, Phantom II

Answer 7

It all depends on the type of flap.  A split flap does not increase the wing surface area, it just changes the camber of the wing.

Fowler flaps

Split flaps-

Slotted flaps

Plain flaps

http://en.wikipedia.org/wiki/Image:Flaps...

Some flaps are a combination of two types, for instance airliners usually have--slotted fowler flaps.  Slotted fowler flaps  increase the are of the wing which increases the lift but the slots increase the lift of each section of flap by allowing airflow over each section of flap.  

Certain settings of flaps will increase drag, overcoming and increase in lift.  For example flaps 40 of a DC-9 increases drag so much it decreases the added lift benefit and as has caused accidents in the past and is no longer allowed anymore unless it is an emergency.

Answer 8

The Flaps increase the lift augmenting the wing camber and the coefficient of lift.

Answer 9

curve. Increasing drag does not increase lift.