Study guide
9.2 Aerodynamics and Flight Controls
AFOQT Study Guide Exam
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1 Chapter 1: AFOQT Orientation and Exam Strategy
1.1 Current AFOQT Exam Facts 1.2 Eligibility, Application, and Scheduling 1.3 Blueprint Domains and Weighting 1.4 Question Style and Score Report Thinking 1.5 Study Calendar and Practice Plan
2 Chapter 2: Verbal Analogies
2.1 Verbal Analogies Overview 2.2 Core Workflows and Decision Points 2.3 Scenario Practice for Verbal Analogies 2.4 Common Traps in Verbal Analogies 2.5 Practice Drills and Readiness Markers
3 Chapter 3: Arithmetic Reasoning
3.1 Arithmetic Reasoning Overview 3.2 Core Problem Types and Solution Workflows 3.3 Scenario Practice and Translation Method 3.4 Common Traps in Arithmetic Reasoning 3.5 Practice Drills and Readiness Markers
4 Chapter 4: Word Knowledge
4.1 Word Knowledge Overview 4.2 Decoding Words: Roots, Prefixes, and Suffixes 4.3 Working a Synonym Question Step by Step 4.4 Common Traps in Word Knowledge 4.5 Practice Drills and Readiness Markers
5 Chapter 5: Math Knowledge
5.1 Math Knowledge Overview 5.2 Core Algebra and Geometry Workflows 5.3 Worked Problem Walkthroughs 5.4 Common Traps in Math Knowledge 5.5 Practice Drills and Readiness Markers
6 Chapter 6: Instrument Comprehension
6.1 Instrument Comprehension Overview 6.2 Reading the Attitude Indicator and Compass 6.3 Matching the Dials to the Silhouette Airplanes 6.4 Common Traps in Instrument Comprehension 6.5 Practice Drills and Readiness Markers
7 Chapter 7: Block Counting
7.1 Block Counting Overview 7.2 Core Workflows and Decision Points 7.3 Scenario Practice for Block Counting 7.4 Common Traps in Block Counting 7.5 Practice Drills and Readiness Markers
8 Chapter 8: Table Reading
8.1 Table Reading Overview 8.2 Core Lookup Workflow and Speed Technique 8.3 Reading the Grid: Worked Lookups 8.4 Common Traps in Table Reading 8.5 Practice Drills and Readiness Markers
9 Chapter 9: Aviation Information
9.1 Aviation Information Overview 9.2 Aerodynamics and Flight Controls 9.3 Aircraft Structure, Engines, and Instruments 9.4 Airport Operations, Markings, and Common Traps 9.5 Practice Drills and Readiness Markers
10 Chapter 10: General Science
10.1 Physical Science Overview 10.2 Core Concepts: Forces, Energy, and Simple Machines 10.3 Waves, Heat, and the Electromagnetic Spectrum 10.4 Chemistry and Electricity Essentials 10.5 Earth/Space Science and Practice Drills
11 Chapter 11: Situational Judgment
11.1 Situational Judgment Overview 11.2 Core Workflows and Decision Points 11.3 Scenario Practice for Situational Judgment 11.4 Common Traps in Situational Judgment 11.5 Practice Drills and Readiness Markers
12 Chapter 12: Reading Comprehension
12.1 Reading Comprehension Overview 12.2 Core Reading Methods and Question Types 12.3 Scenario Practice for Reading Comprehension 12.4 Common Traps in Reading Comprehension 12.5 Practice Drills and Readiness Markers
13 Chapter 13: Self-Description Inventory
13.1 Self-Description Inventory Overview 13.2 The Big Five and Response Strategy 13.3 Scenario Practice: Reading SDI Statements 13.4 Common Traps in the Self-Description Inventory 13.5 Practice Drills and Readiness Markers
14 Chapter 14: Final Review and Test Day
14.1 Timed Practice Strategy 14.2 Last-Week Review Map 14.3 Exam-Day Checklist 14.4 After the Exam and Next Steps
9.2 Aerodynamics and Flight Controls
Key Takeaways Explain This Topic AI
Lift comes from pressure differences over the wing; angle of attack (AOA) is the angle between chord line and relative wind.
Three axes: roll (ailerons, longitudinal axis), pitch (elevator, lateral axis), yaw (rudder, vertical axis).
A stall happens when the critical AOA (about 15-20 degrees) is exceeded — it depends on AOA, not airspeed.
Flaps add camber/area to raise lift at low speed; spoilers dump lift; trim relieves control pressure.
Last updated: June 2026
9.2 Aerodynamics and Flight Controls
More AI points come from aerodynamics and flight controls than from any other topic, so master this first. The concepts chain together: lift depends on angle of attack, exceeding angle of attack causes a stall, and the flight controls are simply the means by which a pilot changes attitude and therefore angle of attack and bank. If you understand the chain, you can reconstruct most answers even when a question is phrased unusually.
Lift and the four forces
Lift is generated as air flows over a wing (airfoil). The curved upper surface speeds the airflow and lowers its pressure, while higher pressure beneath pushes the wing up — an application of Bernoulli's principle combined with Newton's deflection of air downward. In steady straight-and-level flight, lift = weight and thrust = drag . Increase thrust and you accelerate until drag rises to match it again.
Angle of attack (AOA) is the angle between the wing's chord line (an imaginary straight line from leading edge to trailing edge) and the relative wind (the oncoming airflow). Do not confuse it with angle of incidence , the fixed mounting angle of the wing to the fuselage set by the manufacturer. As AOA increases, lift increases — up to the critical angle of attack , typically 15-20 degrees .
Stalls
Beyond the critical AOA the airflow separates from the upper wing surface, lift collapses, and the wing stalls . The single most-tested fact here: a stall is a function of AOA, not airspeed . An aircraft can stall at any speed and any attitude if the critical AOA is exceeded — including in a high-speed turn (an accelerated stall). Recovery means reducing AOA , usually by lowering the nose.
The three axes
- Axis Motion Primary control Where it is
- Longitudinal (nose-to-tail) Roll (bank) Ailerons Trailing edge, outer wings
- Lateral (wingtip-to-wingtip) Pitch (nose up/down) Elevator Trailing edge, horizontal stabilizer
- Vertical (top-to-bottom) Yaw (nose left/right) Rudder Trailing edge, vertical stabilizer
Ailerons move opposite to each other: one up, one down, creating differential lift that banks the aircraft. The elevator moves the nose up or down. The rudder swings the nose left or right and coordinates turns; it does not turn the airplane by itself — that is the job of bank plus elevator.
Secondary and high-lift devices
Flaps — extend from the trailing edge, increasing wing camber and area to produce more lift at low speed, enabling slower takeoff and landing speeds. They also add drag.
Slats/slots — leading-edge devices that delay the stall by re-energizing airflow at high AOA.
Spoilers — panels on the upper wing that destroy lift and add drag to slow down or steepen a descent; on the ground they help braking.
Trim tabs — small surfaces that relieve the constant control-stick pressure a pilot would otherwise hold.
How a turn actually works
A frequent AI misconception is that the rudder turns the airplane. It does not. To turn, the pilot banks with the ailerons so a component of the wing's lift pulls the aircraft toward the turn, then adds back-pressure on the elevator to hold altitude. The rudder only coordinates the turn, offsetting the adverse yaw the lowered aileron creates. Picture lift as an arrow perpendicular to the wings: when you bank, that arrow tilts, and its horizontal part becomes the turning force. This is why steeper banks turn faster but demand more lift and load the wing more heavily.
Drag types
Drag splits into two families. Parasite drag comes from the aircraft pushing through the air — skin friction, form drag, and interference — and it rises with the square of speed, so it dominates at high speed. Induced drag is the by-product of producing lift; it is greatest at low speed and high angle of attack , such as during a slow climb. The combined total drag is lowest at a middle speed, which is why every airframe has a most-efficient cruise speed. Expect AI to ask which drag dominates when slow (induced) versus fast (parasite).
Mach and load factor
Mach number is the ratio of true airspeed to the local speed of sound (Mach 1 = the speed of sound). Because the speed of sound falls with temperature, Mach changes with altitude even at constant true airspeed; an aircraft holding a steady true airspeed can edge closer to Mach 1 simply by climbing into colder air. Speeds below Mach 1 are subsonic, near Mach 1 transonic, and above it supersonic. Load factor ("G") is the ratio of lift to weight; in a level 60-degree bank it is 2 G , meaning the wing carries twice the aircraft's weight.
Stall speed rises with the square root of load factor — a wing that stalls at 60 knots straight-and-level stalls noticeably higher in a hard turn, which is exactly how an accelerated stall happens. Tie this back to the core rule: more G means more required lift, which means a higher angle of attack, which brings the wing closer to the critical AOA at any given speed.