Silly Photon Drives [1.1.1] Last Updated: October 9th, 2024 KSP 1.12.5 Download *Also on CKAN Although they carry no mass, photons still have momentum. We can use this principle to build engines that use light itself as an exhaust. This is a small mod which adds engines that use electricity to produce light – a photon engine. This is different from a solar/photon sail, which uses light from produced from an external source to push on a sail. These engines produce their own li