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
For now, it is indispensable. Without ballast masses, the economics of rideshare collapse. You cannot fly a variable menu of small satellites without a fixed counterweight. But as on-orbit manufacturing and refueling become real,
Until then, the next time you watch a launch webcast and hear the commentator say, “Payload deployment confirmed,” spare a thought for the last object to separate. “Satellites have bugs
The fairing jettisons. The ingot, still bolted in place, is now exposed to the vacuum of space. It heats up to 120°C on the sun-facing side and drops to -100°C on the dark side. It doesn’t care.
Rawlings laughs, rubbing a scar on his knuckle. “But nobody respects it. You’ll see a team treat a cubesat like a newborn baby—gloves, microscopes, prayers. Then they toss the ingot on the dolly like a bag of cement. Last month, a guy dropped a 300-pounder on his foot. Crushed three toes.”