Chris Roberson

sailship n.	2012 C. Roberson Further: Beyond the Threshold xiii. 67 The Pethesilean mining vessel was a sailship. Propelled by the pressure upon their light[-]reflective sails of photons broadcast from laser arrays in orbit around stars, they are able to reach speeds approaching half the speed of light in one-point-six years.
torchship n.	2012 C. Roberson Further: Beyond the Threshold xxxiii. 155 It couldn’t reach superluminal speeds, but its metric engineering drives could generate internal gravity in the crew compartments, and it could land and take off from spaces that a torchship wouldn’t be able to reach, much less a sailship.