AMT 280 Laboratory Period 5
Slats and Flaps
Increasing Camber or Energy Additions to the Boundary Layer
Wind
tunnel
split
Wind
tunnel
Movable slat
AMT 280 Laboratory
Airfoil Slat & Flap Effects
•
One of the ways to improve the versatility and flight
characteristics of an airplane is to install wing flaps and
slats.
Flaps are designed so that when extended they
not only provide higher lift but also have higher drag.
This allows a steep angle of descent at slow airspeeds
with but keeps the engines spooled up power output-
go-around
•
Objectives
–
Observe the effects of the flap and the slat on a model airfoil
with respect to lift and drag.
–
Observe the general airflow pattern over the airfoil while using
flaps and slats.
–
To observe the creation of wing tip vortices
Airfoil Slat & Flap Effects
Effect of high lift devices
•
The primary purpose of high lift devices
(flaps, slots, slats, etc.) is to increase the
C
Lmax
of the aircraft and to reduce the stall
speed.
•
Take-off and landing speeds are also
reduced and engines are spooled up.
Krueger/Leading edge flap•Krüger flaps were invented by Werner Krüger in 1943 and evaluated in the wind tunnels in Göttingen, Germany. One of the earliest applications was the Boeing 707 in 1954. •The flap was added to prevent wing stall with an extreme attitude take-off with the tail dragging on the runway, a scenario that had already caused two deHavilland Comet accidents.
