Catch the Star Winds — A. Bertram Chandler

Unable to exceed the speed of light, he found ways around the law of nature, twisting space and time to his bidding. But the lure of FTL speeds could would not be forgotten...and the crew of the Flying Cloud - casts-offs from the great civilisations of the galaxy - found themselves breaking through the barriers of the past to discover new worlds - worlds from which they could never return!