T-45 high-speed flight characteristics (found in NATOPS)

T-45A/C TS, ADV & IUT Aero-02

High-Speed Flight

Vortex generators (VGs)

Sg 2, fr 13

Fig 11: Vortex

Single row of 20 installed on each wing at 25%

Generators on the

of wing chord

T-45

Reduce boundary layer growth and delay

forward migration of the shock and shock-

induced separation

Primary purpose to improve longitudinal stability

at speeds above Mach 0.80

Rudder shock stabilization strips

Sg 2, fr 17

Rudder Shock

Stabilization Strips

Two located on each side of vertical tail, one at

50% of tail chord and one just aft of rudder

hinge line

Installed after uncontrollable rudder oscillation

(rudder buzz) occurred at high speed,

Mach 0.9-0.95

(1) Rudder buzz results from unstable shock

wave motion and shock-induced separation

(2) Strips stabilize the shock wave motion

Developed after computational flowfield

analysis and flight tests

C. T-45 high-speed flight characteristics (found in

NATOPS) 1.7.1.4.6

Capable of transonic flight ONLY in a dive and in a

clean configuration

Sg 2, fr 18

Aft Movement of the

Speeds up to Mach 1.04 have been achieved

Center of Pressure

No pronounced nose-down pitch transient

High-speed acceleration is moderate and Mach

effect is gradual

Page 2-20

(9-99) Original