[Spaceships] getting into orbit without superscience?

[dcarson]

Originally Posted by Stomoxys

The ramjet mode of the SABRE engine is air breathing, burning fuel using oxygen from the surrounding air, so it is useless in an atmosphere with no oxygen.

Titan would be great for an electric propeller plane and it could work in the upper atmosphere of Venus too. XKCD Interplanetary Cessna

On Titan you carry oxygen and use the ramjet mode to scoop in the methane atmosphere as fuel.