The Pirates of Ersatz by Murray Leinster

Hoddan did not worry about his followers -- captives -- noting the obsolescence of the space fleet into which they presently drifted. Ancient hulks and impractical oddities did not seem antique or freakish to them. They had no standards in such matters. The planet Darth seemed slightly off to one side in space, at some times, and at others it seemed underfoot while at others it looked directly overhead. At all times it moved visibly, while the spaceboat and the ships in orbit seemed merely to float in nearly fixed positions. When the dark part of Darth appeared to roll toward the spaceboat again all the bright specks which were ships about them winked out of sight and there were only faraway stars and a vast blackness off to one side like nothingness made visible.

The spearmen were wholly subdued when there was light once more and eccentric shapes around them. There was a ring-ship -- the hull like a metal wheel with a huge tire, with pipe passages from the tire part to the hub where the control room was located. It seemed unbelievable that such a relic could still exist, dating as it did from the period before gravity-fields could be put into spacecraft. It would have provided a crazy sort of gravity by spinning as it limped from one place to another. Whoever had collected this fleet for the emigrants from Colin must have required only one thing -- that there be a hull. Given something that would hold air, a Lawlor drive, a gravity-unit, and air apparatus would turn it into a ship that could go into overdrive and hence cross the galaxy at need. Those who bargained with the emigrants had been content to furnish nothing more than that.