Warshawski sail
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The Warshawski sail is a fictional technological device in the Honorverse. Named after its inventor, the sail is part of the system used for faster-than-light travel. When the sail is "rigged", the alpha nodes of the impeller drive generate disks of gravitational energy hundreds of kilometers wide. In hyperspace, the sails can be used to tap the energy of a grav wave. Before the invention of the sail, grav waves were deadly to all starships. Now, pilots seek them out, so they can reach other stars much faster.
