This thing is cute. Before SpaceX announced Starship, I always expected the first fully-reusable orbital launcher to be very small, because it's so much easier and less expensive to make prototypes, and to come from a small, focused company.
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It has some interesting features. Peroxide/alcohol is a well-recognized option for room-temperature propellants, but I hadn't heard before about dissolving propane in the alcohol to make it self-pressurizing. x.com/vbklgd/status/…