All of the aircraft including small Cessna 172 to giant Antonov An 225 have flaps. But what is the purpose of these flaps? And How do they work? Let's Check it out!
First of all main purpose of flap is to produce more lift to the aircraft. This is done by increasing the camber and the surface area of the aircraft wing. As we know the lift formula is given by
where:
S is Surface area of the wing.
where:
S is Surface area of the wing.
CL is coefficient of lift.
v is free stream velocity.
So from the formula above we know lift is directly proportional to surface area of the wing. So as Surface area of the wing increases lift to the wing increases with it.
Now what flaps do is they increase the camber of the aircraft wing. Camber is just the curve of the wing. As curve of the wing is increased, wing exerts more force on the airflow , So as reaction to this force airflow exerts more force on the wing so more lift.
FLAPS DURING TAKE-OFF.
- Depending on the aircraft type, flaps may be partially extended for take-off When used during takeoff, flaps trade runway distance for climb rate: using flaps reduces ground roll but also reduces the climb rate. The amount of flap used on takeoff is specific to each type of aircraft, and the manufacturer will suggest limits and may indicate the reduction in climb rate to be expected.
- climb rate is the vertical distance travel by an aircraft ,usually expressed in meter per second.
- Flaps may be fully extended for landing to give the aircraft a lower stall speed so the approach to landing can be flown more slowly, which also allows the aircraft to land in a shorter distance.
- While Landing pilot can use maximum settings for flaps. As Flaps increase lift and drag. This will allow aircraft to touchdown slowly.
THANK YOU,
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