Aero Chapter 03, High AOA/Stall/Spin
T-45 Aerodynamics Student Workbook
THREE INVERTED SPIN MODES
Airspeed is the best means of differentiating between the spin modes. Inverted spins have relatively high
lateral accelerations (0.5 to 1.5 g’s) which may add to pilot disorientation (Figure 61).
INVERTED SPIN MODES (true AOA)
TRUE AOA
- 60 degrees
- 40 degrees
-25 degrees
Indicated AOA
0
0
0
Airspeed
50-120
100-160
140-200
Altimeter
Decreasing rapidly
Decreasing rapidly
Decreasing rapidly
VSI
6,000 fpm descent
6,000 fpm descent
6,000 fpm descent
Turn needle
In direction of spin
In direction of spin
In direction of spin
Descent rate
15,000-20,000 fpm
15,000-20,000 fpm
11,000 fpm
Nose attitude
30 degrees down
50 degrees down
65 degrees down
g’s
-1 to -1.4 g’s
-1 to -1.4 g’s
-1 to -1.4 g’s
Airspeed 50 to 120 kts
Altitude Loss Per Turn 1,000 ft
15 - 20 Turns / Minute
-30 Pitch
-60 AOA Spin
-60 AOA
Airspeed 100 - 160 kts
Altitude Loss Per Turn 1,000 ft
15 - 20 Turns / Minute
-40 AOA Spin
-50 Pitch
-40 AOA
Airspeed 140 - 200 kts
Altitude Loss Per Turn 1,100 ft
10 Turns / Minute
-25 AOA Spin
0 Units AOA
-65 Pitch
Negative G
Turn Needle in Direction of Spin
Steady State IAS
Figure 61: INVERTED SPIN MODES
Page 38
(7-99) Original
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