Aerospace engineering spans aerodynamics, propulsion, structures, avionics, orbital mechanics, flight dynamics, and space systems. This glossary provides a broad, authoritative vocabulary foundation for students, engineers, pilots, and space professionals.
- A
- Above Ground Level — Height measured relative to terrain directly below an aircraft.
- Absolute Humidity — Water content of air in g/m³ or g/kg.
- Acceleration — Rate of change of velocity; vector quantity.
- Acquisition of Signal — Moment a spacecraft rises above horizon for communication.
- Aerodynamics — Study of airflow and forces on bodies.
- Airfoil — Wing or blade cross‑section generating lift.
- Angle of Attack — Angle between chord line and airflow.
- Avionics — Electronic systems for navigation, communication, and control.
- Action — Functional used to derive equations of motion.
- Airworthiness Directive — FAA‑issued mandatory safety requirement.
- Autopilot — Automatic flight‑control system.
- Airspeed Indicator — Cockpit instrument measuring dynamic pressure‑based speed.
- Ablation — Heat‑shield material removal to dissipate thermal loads.
- B
- Boundary Layer — Thin viscous airflow region near surfaces.
- Bypass Ratio — Ratio of bypass air to core air in turbofans.
- Burn Rate — Speed at which solid propellant combusts.
- Ballistic Coefficient — Measure of aerodynamic efficiency in reentry/ballistics.
- Bank Angle — Tilt of aircraft during turns.
- Boost Phase — Rocket ascent period under powered thrust.
- C
- Composite Material — Engineered materials with high strength‑to‑weight ratio.
- Computational Fluid Dynamics — Numerical simulation of fluid flow.
- Center of Gravity — Balance point of aircraft mass.
- Chord — Straight line between leading and trailing edges.
- Control Moment Gyroscope — Spacecraft attitude‑control device.
- Critical Mach Number — Lowest Mach where local airflow reaches Mach 1.
- Cryogenic Propellant — Super‑cold fuels like LH₂ and LOX.
- D
- Delta‑v — Required velocity change for maneuvers.
- Drag — Aerodynamic force opposing motion.
- Dihedral — Upward wing angle improving roll stability.
- Dynamic Pressure — .
- Docking — Joining of two spacecraft.
- E
- Escape Velocity — Minimum speed to escape gravity.
- Empennage — Tail assembly for stability.
- Elevon — Combined elevator + aileron control surface.
- Exhaust Velocity — Speed of expelled propellant determining rocket performance.
- F
- Finite Element Analysis — Structural simulation method.
- Flutter — Aeroelastic instability causing oscillation.
- Fuel Cell — Electrochemical power source for spacecraft.
- Flight Envelope — Safe operational limits of aircraft.
- G
- Geostationary Orbit — Orbit matching Earth’s rotation.
- G‑Force — Acceleration relative to gravity.
- Guidance System — Determines trajectory commands for flight.
- H
- Hohmann Transfer — Fuel‑efficient orbital transfer.
- Hypersonic — Speeds above Mach 5.
- Heat Shield — Protects spacecraft during reentry.
- Heliocentric Orbit — Orbit around the Sun.
- I
- Inertial Navigation System — Navigation using gyros/accelerometers.
- Incidence Angle — Angle between wing chord and fuselage axis.
- Isp (Specific Impulse) — Rocket efficiency measure.
- J
- Jet Engine — Air‑breathing thrust‑producing engine.
- Jettison — Releasing mass (e.g., fuel tanks) to reduce weight.
- K
- Kármán Line — Conventional boundary of space (~100 km).
- Kinetic Pressure — Another term for dynamic pressure.
- L
- Lift — Aerodynamic force perpendicular to airflow.
- Laminar Flow — Smooth, layered airflow.
- Launch Vehicle — Rocket delivering payloads to orbit.
- Load Factor — Ratio of lift to weight (n‑factor).
- M
- Mach Number — Speed relative to sound.
- MTOW — Maximum takeoff weight.
- Moment of Inertia — Resistance to rotational acceleration.
- Monocoque — Structural design using skin for load‑bearing.
- N
- Nacelle — Engine housing.
- Navigation — Determining position and path.
- Normal Shock — Perpendicular shock wave in supersonic flow.
- O
- Orbital Mechanics — Motion of bodies under gravity.
- Orbit — Repeating gravitational trajectory.
- Oxidizer — Chemical enabling fuel combustion in rockets.
- P
- Payload — Useful cargo carried by aircraft/spacecraft.
- Propellant — Fuel + oxidizer mixture for rockets.
- Pitch — Rotation about lateral axis.
- Pressure Altitude — Altitude based on standard pressure.
- Q
- Dynamic Pressure (q) — Aerodynamic pressure from motion.
- Q‑Bar — Cockpit indicator of dynamic pressure.
- R
- Ramjet — Air‑breathing engine using inlet compression.
- Reaction Control System — Thrusters for spacecraft attitude control.
- Reentry — Spacecraft return through atmosphere.
- S
- Scramjet — Supersonic‑combustion ramjet.
- Stall — Loss of lift from excessive AoA.
- Shock Wave — Sudden pressure jump in supersonic flow.
- Solar Array — Spacecraft power‑generating panels.
- T
- Thrust — Propulsive force from engines.
- Turbofan — Jet engine with bypass airflow.
- Trim — Adjusting controls for steady flight.
- U
- UAV — Unmanned aerial vehicle.
- Umbilical — Ground connections supplying power/fluids to rockets.
- V
- Vertical Stabilizer — Tail fin providing yaw stability.
- Vortex — Rotational airflow, often at wingtips.
- V₁ Speed — Takeoff decision speed.
- W
- Wing Loading — Weight divided by wing area.
- Weight — Force due to gravity acting on mass.
- Winglet — Tip device reducing induced drag.
- X
- X‑Plane — Experimental research aircraft series.
- X‑Band — Radar/communication frequency band.
- Y
- Yaw — Rotation about vertical axis.
- Yoke — Primary flight control column.
- Z
- Zenith — Point directly overhead; used in tracking.
- Zero‑Lift Drag — Drag at zero lift coefficient.
