SpaceX is ready to fly the full Starship stack for the sixth time tomorrow. Starship Flight 6 comes just a month after Flight 5 took to the skies. During Flight 6, SpaceX will not only attempt to catch the 232-foot-tall with the catch tower again, but it will also test the second-stage Starship spacecraft to the limit and attempt an in-space Raptor ignition. The latter test is key to the long-term progress of the Starship program since it will form the backbone of the rocket's missions to the Moon and Mars.
SpaceX To Test Starship Second Stage Engine, Thermal Endurance During Flight 6
Between Starship's Flight 1 and Flight 5, SpaceX has achieved several test objectives and discovered new hurdles on its path to getting the world's most powerful rocket to operational status. These have included gradually improving Raptor engine reliability over the course of successive tests, to improving heat shield design, better protection for flaps and a new stage-separation system. For Flight 6, SpaceX plans to build on these challenges and focus particularly on the upper-stage Starship spacecraft.
In an earlier update, the firm shared that with Starship Flight 6, it will test additional thermal insulation on the ship and fly it at a steeper angle to test out flap control. The latter test, according to SpaceX, is key for the Starship program's most important objective of reusing the upper-stage spacecraft. Out of all the rocket systems in the world, only SpaceX's Falcon 9 is an orbital-class rocket whose booster can land via self-propulsion.
No rocket has a reusable second stage, and as the Falcon 9's second stage is a key cost driver for its launches, SpaceX plans to recover and reuse the Starship second stage.
The recovery will also be part of Flight 6. While SpaceX will not return the ship to the pad, it will fly certain sections of the second stage without heat shield tiles to understand the impact of atmospheric forces on them during reentry. The Starship Super Heavy booster is caught by the launch tower through pins located at the top, and SpaceX will have to install similar hardware on the ship for its catch as well. However, unlike the Super Heavy, the heat shield is an indispensable part of the upper-stage Starship and requires careful evaluation of its design before any changes.
SpaceX will also test the in-space reignition of a Raptor engine on the second stage Starship. This is another key test since it will provide teams with the data to conduct long-duration Starship missions. The in-space reignition has been part of SpaceX's agenda since it started testing the full Starship stack, but it has been delayed for one reason or another. This test will also mark the stepping stone for Starship's in-space refueling tests scheduled for 2025. These tests are necessary for NASA's Artemis program since they will demonstrate SpaceX's ability to build a propellant depot in space to fuel NASA's lunar lander.
Starship Flight 6 will also pave the way for the second-generation Starship second stage. This rocket, which has undergone pressurization tests, has larger tanks and improved heat shield tiles as part of the first major generational rocket design upgrade for the Starship program.
About the author: Ramish is a seasoned technology writer and editor with more than a decade of experience. He specializes in semiconductor fabrication and market analysis. With a background in finance and supply chain management - via his bachelors in Finance and a micromasters in supply chain management from MIT - Ramish combines financial rigor with deep industry insight to deliver accurate and authoritative coverage.
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