Learning Lab
How to Make a Rocket Work
No equations required. Five plain steps from thrust on the pad to landing a booster for reuse.
One sentence
Throw mass down fast enough, and the vehicle goes up — then keep going sideways until you miss the ground forever.
- 1
Make thrust
Burn propellant in a combustion chamber. Hot gas accelerates out a nozzle. By Newton’s third law, the vehicle accelerates the other way.
- 2
Fight gravity & drag
Thrust must exceed weight at liftoff. Early flight is a gravity turn: pitch over gradually so horizontal speed builds while drag stays manageable.
- 3
Stage and drop mass
Empty tanks are dead weight. Stage separation drops spent boosters so the upper stage can accelerate the payload more efficiently.
- 4
Reach orbital velocity
Low Earth orbit needs ~7.8 km/s horizontal. Once circularized, you fall around Earth continuously — that is orbit.
- 5
Deploy or land
Payloads deploy to their orbits. First stages can boost-back, reenter, and land for reuse — the key cost lever of modern flight.
Propellant
Fuel + oxidizer. Falcon uses RP-1 and liquid oxygen; Starship uses methane and LOX.
Guidance
Flight computers steer gimbals and fins so the rocket follows a planned gravity turn.
Reuse
Grid fins, cold gas thrusters, and landing burns bring the booster home for another flight.