Quantcast High-lift devices in T-45 provide excellent slow flight characteristics

 

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Slow-Speed Flight, Stall and Spin, and AOA System
T-45A/C TS, E2-C2, ADV & IUT Aero-03
(1) On a leading edge of large radius, the flow
is smooth
(2) On an airfoil with a small radius leading
Sg 1, fr 5
Fig 1: Leading Edge
edge (T-45), the air flow tends to "jump"
Vortexing (3 overlays)
around the leading edge due to the
discontinuity
Overlay 1
(a) An area of low pressure forms on the
leading upper surface of the small
radius leading edge
Overlay 2
(b) High pressure air from under the wing
comes around the leading edge
creating a leading edge vortex
Overlay 3
(c) Joins with spanwise flow to give tip
stall
Sg 1, fr 7
Fig 2: Tip Stall
c.
As tip stalls
(3 overlays)
(1) Ailerons become ineffective
Overlay 1
(2) A loss of lateral stability occurs as center of
pressure of each wing moves inboard
(3) No stall warning occurs
Overlay 2
d.
As centers of pressure move inboard on each
wing, they also move forward, shifting the
aerodynamic center of the aircraft forward
Overlay 3
(1) If aerodynamic center shifts forward of
center of gravity, aircraft will have negative
longitudinal stability, and nose will pitch up
C. High-lift devices in T-45 provide excellent slow flight
characteristics 1.7.1.4.1.2
Sg 1, fr 10
1.
Geometric twist (3-1/2 degrees)
Fig 3: Effect of
Geometric Twist,
a.
Reduces angle of attack of tip compared to root
Flaps, and Slats
b.
Accomplished by reducing angle of incidence
used at tip compared to root
(9-99) Original
Page 3-4


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