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How do reusable rockets land?

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Quick answer

Reusable rockets land by using their engines to decelerate during descent. After stage separation, the booster flips, performs burns to control its path, and deploys grid fins for steering. A final landing burn slows it to a soft touchdown on a pad or drone ship, allowing recovery and reuse.

Reusable rockets land by firing their engines to slow down, then deploying grid fins and landing legs for a controlled touchdown. This allows the booster to be recovered and flown again, cutting launch costs.

Step by step

  1. Stage separation occurs: the booster detaches from the upper stage and payload.
  2. The booster flips around using cold gas thrusters to point its engines forward.
  3. A boostback burn adjusts the trajectory toward the landing zone.
  4. Grid fins deploy and a re-entry burn slows the rocket as it descends through the atmosphere.
  5. A landing burn ignites the center engine, and landing legs deploy for touchdown.
  6. The rocket lands softly on a pad or drone ship and is recovered for reuse.

Key things to understand

  1. After stage separation, the booster flips around using small thrusters so its engines face the direction of travel.
  2. It then performs a boostback burn to adjust its trajectory toward the landing site.
  3. During descent, grid fins steer the rocket and a re-entry burn slows it before the atmosphere thickens.
  4. Near the ground, the center engine ignites for a landing burn, deploying legs just before touchdown.
  5. The rocket touches down softly on a pad or drone ship, ready for inspection and reuse.

Labelled diagram

  1. Separation

    Booster detaches from upper stage and payload.

  2. Flip

    Thrusters turn booster engines to face direction of travel.

  3. Boostback

    Engines fire to adjust trajectory toward landing site.

  4. Re-entry

    Grid fins steer and a burn slows descent through atmosphere.

  5. Landing Burn

    Center engine ignites for final deceleration.

  6. Touchdown

    Legs deploy and rocket lands softly on pad or ship.

Reusable Rocket Landing Sequence

Real-world examples

  • SpaceX's Falcon 9 booster lands on a drone ship in the Atlantic Ocean after launching satellites.
  • Blue Origin's New Shepard rocket lands vertically on a concrete pad in West Texas after a suborbital flight.
  • Rocket Lab has recovered some Electron boosters that descended by parachute to an ocean splashdown.
  • The Space Shuttle solid rocket boosters were recovered by parachute from the ocean and reused.

Common mistake

✗ Myth: Reusable rockets glide back to a runway like an aeroplane.

✓ Fact: Boosters such as Falcon 9 land vertically on rocket thrust: grid fins steer, and a final engine burn slows the rocket almost to a stop as its legs touch down.

People also ask

How do rockets land vertically?
Rockets land vertically by firing their engines downward to counteract gravity and slow their descent. They use fins and thrusters to stay upright, then deploy legs for a soft touchdown. This method requires precise control and enough fuel for the final burn.
What is a boostback burn?
A boostback burn is a maneuver where a rocket fires its engines after stage separation to reverse its horizontal velocity and head back toward the launch site. It helps the booster land on a pad or drone ship close to the coast.
Why are grid fins used on rockets?
Grid fins are used on rockets to provide steering during atmospheric descent. They can tilt to change the rocket's direction, allowing it to target a specific landing spot. They are effective at both supersonic and subsonic speeds.
Why do reusable rockets land on a ship instead of always on land?
Landing on a drone ship saves fuel because the rocket doesn't need to fly all the way back to the launch site. For high-speed missions, the booster may not have enough propellant to return to land, so a ship positioned downrange is the only option.
How does the rocket survive the heat of re-entry?
The booster re-enters at a shallower angle and lower speed than an orbital spacecraft, and its engines and structure are designed to withstand the heat. A re-entry burn also slows it down before the most intense heating occurs.
What happens to the rocket after it lands?
After landing, the booster is secured, safed, and transported back to a hangar. Engineers inspect and refurbish components, then it can be prepared for another launch, though some parts may be replaced.
Can the second stage of a rocket be reused too?
Most reusable rockets today only reuse the first stage, or booster. The second stage, which carries the payload to orbit, is usually discarded because it reaches orbital velocity and would need heavy heat protection to survive re-entry.

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