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T-45A/C TS, ADV & IUT Aero-02
High-Speed Flight
Sg 1, fr 5
(4) Spread at the speed of sound
Temperature and
Speed of Sound
(a) Speed of sound depends on air
Relationship
temperature, i.e., at 59 degrees F, the
sea level speed of sound is 662 knots;
at 90 degrees, it is 687 knots; at 32
degrees, it is 643 knots
(b) Speed of sound decreases with
altitude
3.
Compressibility effects occur at lower IAS as altitude
increases
4.
Relationship described by Mach number (the ratio of
true airspeed to the speed of sound)
a.
Compressibility effects (assume high thickness-
to-chord ratio and rounded large radius leading
Sg 1, fr 7
edge)
Fig 1: Subsonic Flow
About an Airfoil
b.
Local sonic flow on airfoil at speed less than
Sg 1, fr 8
Mach 1
Critical Mach Number
c.
Critical Mach number 1.7.1.4.6
(1) Flight Mach number at which the first sonic
flow on the aircraft occurs
(2) Important reference point because it is the
beginning of the transonic flight regime
Sg 1, fr 10
(a) Airflow is mixed--part subsonic, part
Fig 2: Compression
supersonic
Wave Formation
(b) 0.8 Mach in T-45
(i) Occurs on wingtips
(ii) Occurs on landing gear door blister
Page 2-4
(9-99) Original


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