- Aerodynamics
- The study of how air flows around a moving object, and the forces (like drag and lift) that result.
- Apogee
- The highest point of a rocket's flight, where vertical velocity briefly reaches zero before descent begins.
- Avionics
- The onboard electronics of a flight vehicle: sensors, flight computer, telemetry and power.
- Burnout
- The moment a motor finishes burning its propellant and stops producing thrust.
- Centre of Gravity (CG)
- The point where a rocket's mass can be considered to be concentrated for balance purposes.
- Centre of Pressure (CP)
- The point where the net aerodynamic force on a rocket can be considered to act.
- Drag
- The aerodynamic force that opposes a rocket's motion through the air.
- FEA
- Finite Element Analysis — a computational method for predicting how a structure behaves under load.
- FMEA
- Failure Mode and Effects Analysis — a structured method for identifying how a system could fail, its effects, and mitigations, before failure happens.
- Flight computer
- The onboard electronics that read sensors and make decisions, such as when to deploy recovery.
- GNC
- Guidance, Navigation and Control — the discipline of determining a vehicle's position/state and controlling its path.
- HIL
- Hardware-in-the-Loop — testing real flight hardware against a simulated environment before flight.
- IMU
- Inertial Measurement Unit — a sensor combining an accelerometer and gyroscope to measure motion.
- Impulse
- The total 'push' a motor delivers over its burn, used to classify motors by letter (e.g., A–G).
- Motor
- The certified commercial device that burns propellant to produce thrust.
- Payload
- The experiment, sensor package, or cargo a rocket carries, separate from the vehicle's own flight systems.
- PDR
- Preliminary Design Review — checks the overall design approach is sound before detailed design work.
- CDR
- Critical Design Review — checks the design is complete and correct before build begins.
- Recovery
- The subsystem (usually a parachute) that slows a rocket's descent for a safe, reusable landing.
- Static margin
- The distance between CP and CG, expressed in body diameters (calibers), indicating stability margin.
- Telemetry
- Data transmitted in real time from the vehicle to a ground receiver during flight.
- Thrust
- The forward force produced by the motor that accelerates the rocket.
- Thrust curve
- A graph of a motor's thrust over the duration of its burn.
- Verification
- Confirming a system was built correctly, according to its design and requirements.
- Validation
- Confirming a system actually meets the intended mission need, not just its written requirements.