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Marking a first for our Deepwater collection, a fresh dial with Arabic numerals at the quarter hours adds vintage character to the streamlined 40.5mm stainless-steel case. It's finished with a 5-link stainless-steel bracelet featuring a butterfly clasp, while a ceramic top ring brings a nice shine to this rugged...

46,594 views • 4 months ago •via X (Twitter)

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Elon Musk says steel killed carbon fiber on Starship at one-fiftieth the cost. Carbon fiber was supposed to be the future of rocketry. Lighter than aluminum. Stronger than steel. Trusted by every Formula 1 team. SpaceX picked it for Starship. "Particularly if you go for a high-strength specialized carbon fiber that can handle cryogenic oxygen, it's roughly 50 times the cost of steel." Then progress stalled. The autoclaves needed to cure the resin had to outsize every autoclave on Earth, and the team couldn't even produce a clean barrel section without wrinkles. Musk, watching the Mars timeline slip: "At this rate, we're never going to get to Mars. So we've got to think of something else." So he asked the question nobody at SpaceX had asked: "What about steel?" It became known as the cryogenic stainless flip. Musk, who had already shipped Falcon 9 in aluminum-lithium, broke with the textbook. "When you look at the material properties of stainless steel, full-hard, strain hardened stainless steel, at cryogenic temperature the strength to weight is actually similar to carbon fiber." Starship ran on cryogenic methane and oxygen. The airframe lived at temperatures that flipped steel ahead of carbon fiber. "You could smoke a cigar while welding stainless steel." After Musk made the call, steel weighed less than the carbon fiber version. Fifty times cheaper in raw material. Twice the heat tolerance. Half the heat shield mass. Musk, looking back: "In retrospect, we should have started with steel in the beginning. It was dumb not to do steel." What "obvious" material in your work is silently costing you the project? — Elon Musk (.Elon Musk , CEO of Tesla and SpaceX, on Dwarkesh Patel's (.Dwarkesh Patel) podcast

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Elon Musk says steel killed carbon fiber on Starship at one-fiftieth the cost. Carbon fiber was supposed to be the future of rocketry. Lighter than aluminum. Stronger than steel. Trusted by every Formula 1 team. SpaceX picked it for Starship. "Particularly if you go for a high-strength specialized carbon fiber that can handle cryogenic oxygen, it's roughly 50 times the cost of steel." Then progress stalled. The autoclaves needed to cure the resin had to outsize every autoclave on Earth, and the team couldn't even produce a clean barrel section without wrinkles. Musk, watching the Mars timeline slip: "At this rate, we're never going to get to Mars. So we've got to think of something else." So he asked the question nobody at SpaceX had asked: "What about steel?" It became known as the **cryogenic stainless flip**. Musk, who had already shipped Falcon 9 in aluminum-lithium, broke with the textbook. "When you look at the material properties of stainless steel, full-hard, strain hardened stainless steel, at cryogenic temperature the strength to weight is actually similar to carbon fiber." Starship ran on cryogenic methane and oxygen. The airframe lived at temperatures that flipped steel ahead of carbon fiber. "You could smoke a cigar while welding stainless steel." After Musk made the call, steel weighed less than the carbon fiber version. Fifty times cheaper in raw material. Twice the heat tolerance. Half the heat shield mass. Musk, looking back: "In retrospect, we should have started with steel in the beginning. It was dumb not to do steel." What "obvious" material in your work is silently costing you the project? If you're new here, GeniusThinking is a gallery for the greatest minds in economics, psychology, and history. Follow along for more similar content. P.S. I've made a free playbook on how to use and create your own mental models. This includes the same thinking strategies Feynman, Munger, and Musk built their careers on. Ttrusted by 5,000+ founders and investors. Grab your copy: — Elon Musk ( Elon Musk ), CEO of Tesla and SpaceX, on Dwarkesh Patel's ( Dwarkesh Patel ) podcast

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