Super Heavy

Super Heavy is the giant first-stage booster that lifts Starship, SpaceX's fully reusable two-stage system built to carry crew and cargo to Earth orbit, the Moon, and Mars. It is the most powerful rocket booster ever built, and it is built to come home: instead of being thrown away, it flies back to the launch site and gets caught in mid-air by two arms on the tower. The tower caught boosters on Flights 5, 7, and 8, and two of those caught boosters flew again on Flights 9 and 11.

What is Super Heavy?

The Version 3 Super Heavy stands about 72 meters tall, roughly a 23-story building, and 9 meters wide. It runs on 33 Raptor 3 engines burning liquid methane (CH4) and liquid oxygen (LOX), a mix engineers call methalox. At liftoff it makes about 80.8 meganewtons of thrust by SpaceX's figures, about 18.2 million pounds. It is the bottom half of Starship, the stage that does the hard work of getting off the ground.

Why Super Heavy Exists

The booster exists to solve the oldest problem in spaceflight: rockets are usually thrown away after one use, which is an expensive way to travel. Super Heavy grew out of SpaceX's earlier interplanetary transport ideas, once called BFR, and the thinking behind it is clear. Reuse both stages, carry more payload per flight, fly more often, and build rockets on a factory line, and it all points at one goal: driving the cost per kilogram to orbit down far enough to make missions to the Moon and Mars affordable.

How it Works

The 33 engines are laid out as 13 inner units that gimbal, meaning they swivel to steer, and 20 fixed outer units. Together they make Super Heavy the heavyweight of liftoff thrust, well ahead of NASA's Space Launch System and more than double the Apollo-era Saturn V.

That muscle comes from the Raptor engine, which has grown stronger with every generation. Sea-level thrust climbed from Raptor 1 to Raptor 2 to the current Raptor 3, the engine on the Version 3 booster, at 280 metric tons of thrust each.

The real trick, though, is the way it comes home. Rather than landing on legs or splashing into the ocean, Super Heavy flies back to the launch site and gets caught in mid-air by two mechanical arms on the tower, hardware nicknamed Mechazilla. Catching the booster right at the pad means it can be inspected, test-fired, and reflown from the same spot, with no barge, no fishing it out of the Gulf, and no long teardown.

The Economics of Super Heavy

Reusing the whole first stage is meant to drive the cost per kilogram to orbit sharply down. The key is the Raptor engine getting more powerful while shedding weight: Raptor 3 dropped the engine heat shields and built the plumbing right into the engine, so the engine and vehicle hardware got much lighter. More thrust from less metal is a power-to-weight gain, and it adds up fast across 33 engines.

Current Status of Super Heavy

Through Flight 14 on September 28, 2026, the first Starship flight to reach orbit, SpaceX has flown 14 integrated test flights. The Version 3 booster is in its first round of flight tests. On Flights 12 and 13, fewer engines relit for the return than planned, and both boosters came down in the Gulf. On Flight 14, SpaceX planned the boostback burn, which turns the booster back toward the launch site, to use up the liquid oxygen left in its main tank as a test of its limits before future returns to the tower, and the booster splashed down in the Gulf on three engines.

What Comes Next

The goal is fast, full reuse, with turnaround shrinking from months toward the one-to-two-month range and, eventually, weeks. If catching a booster becomes as routine as landing an airplane, frequent flight stops being a rare event and becomes a habit. That falling cost is what pays for crewed Moon and Mars missions and large-scale satellite deployment.

The Bottom Line

Super Heavy already has the thrust SpaceX designed it for, and the savings come from catching it at the tower and flying it again, the next step for the Version 3 booster.