Among the three car brands owned by BMW, Mini Cooper represents the youthful, urban-friendly option, while Rolls-Royce focuses on opulence and luxury. BMW stands in the middle as a premium offering ...
Robert Zubrin talks about reducing the mass of SpaceX Starship by a factor of 5 for a Starboat mini-Starship. The linear dimensions would scale by the cube root of 1/5 ≈ 0.58. This gives a diameter of ...