finals first Flashcards
to reduce the distances from take-off and landing.
This allows operation at greater weights from the provided runway lengths and allows carrying
higher payloads.
High lift devices
The distances of take-off and landing depend on the velocities required at the screen and
these are set out in the performance regulations. One of the criteria for both take-off and
landing is for a healthy gap over the stoppage speed
(1.2 VS1 for take-off and 1.3 VSO for
landing).
is a hinged portion of the trailing or leading edge that can be deflected downwards and
thus create a camber increase.
Flaps
has a simple construction and provides a reasonable
increase in CLMAX, but with a reasonably high drag. It is primarily used on low-speed aircraft
and where very fast take-off and landing are not necessary.
Plain Flap
The flap forms part of the lower surface of the trailing edge of the wing, with the upper surface
contour not affected when the flap is lowered.
Split flap
gives about the same increase in lift as the plain flap at low angles of attack, but
gives slightly more at higher angles as there is no increase in the upper surface camber and
so separation is delayed. However, because of the wake ‘s increased depth the drag is higher
than for the simple flap.
Split Flap
When the_____ is lowered a slot or gap between the wing and the flap is opened.
Slotted Flap
The aim of the _____is to guide higher pressure air over the flap from the lower surface, and to
re-energize the boundary layer. This retards the airflow separation on the flap’s upper surface.
slot
travels backwards and downwards, giving initially an increase in
wing area, and then an increase in camber.
Fowler Flap
Drag decreases the acceleration during take-off, and so the flap should offer as ______ as
possible.
Little Drag
If the flaps
are lowered the downwash will increase and the angle of attack on the tailplane will decrease,
creating a moment of nose-up pitching,
slat is a small auxiliary aerofoil fixed to the wing ‘s leading edge,
Slat
If the flaps are lowered the
downwash will increase and the angle
of attack on the tailplane will decrease,
creating a moment of nose-up pitching.
If the flaps are lowered the
downwash will increase and the angle
of attack on the tailplane will decrease,
creating a moment of nose-up pitching.
is part of the
lower surface of the leading
edge which can be rotated
around its forward edge.
Krueger Flaps
is a gap between the
lower surface and the upper edge of the
leading edge, and can be fixed or formed by
pushing forward part of the leading edge
leading Edge slot
