It's not. That thing is called the rocket equation and the law is logarithmic. https://en.wikipedia.org/wiki/Tsiolkovsky_rocket_equation https://en.wikipedia.or

It's not. That thing is called the rocket equation and the law is logarithmic. https://en.wikipedia.org/wiki/Tsiolkovsky_rocket_equation https://en.wikipedia.org/wiki/Tsiolkovsky_rocket_equation So basically in your example, if the Earth gravity was 1.3% stronger, payload would be ~37.8t instead of 40.