Did anyone else notice that the default plane the "albatross" (which is probably the first one most people fly) has the same name as the first airplane ever built in Jules Verne's science fiction book "Robur the Conqueror"?
Take of the battery, add an RTG. Use a command seat instead of a lander can. Add a large reaction wheel instead of the RCS. You could probably also do it with just one ehat shield.... Just try to make it smaller.
Unless im missunderstanding this, the game is 32bit, and they would have used a float for the velocities, so this may be the actual highest possible speed in the game...