But as on-orbit manufacturing and refueling become real, the ingot’s days are numbered. Future rockets will likely use or active mass shifters to balance the stack, turning the ballast into usable fuel.
“It’s the only part of the rocket that never fails,” says veteran integration technician Dave Rawlings. “Satellites have bugs. Engines have leaks. But the ingot? It just sits there. It is perfectly, stupidly reliable.” launch ingot
In response, several startups are now developing —magnesium-aluminum alloys designed to re-enter and fully ablate within 90 days. Others are experimenting with hollow water ingots (frozen, then sublimated in space), though the risk of ice shards damaging the fairing remains high. The Technician’s Curse Back on the ground, the ingot enjoys a strange kind of reverence. But as on-orbit manufacturing and refueling become real,