The rocket engine has always been a compromise—striking a delicate balance between power and efficiency. However, SpaceX's Raptor engine is changing the game with its radical design and meticulous ...

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 ...

The Earth is much larger than most people realize. You need to use engines if you want to efficiently navigate large sections of the planet. Everything from cars to planes relies on engines, but they ...