A. Bertram Chandler

A man in WW2 Britain trades minds with his descendant, an officer on a spaceship. They are shipwrecked on Venus, where his 20th century seaman’s experience saves the day.
—Dave Hook

Upon his 21st birthday, the twentieth in the line of descendants of Aubrey St. John Sheraton is to be taken into confidence about the secret of his family’s centuries-long financial success.

Pilot Tillot (still grieving over the recent loss of Valerie—yes, the car accident was quite likely his fault) and inventor Abbotsford set out to test the first FTL engine, which turns out to not move so quickly in space after all, although it does make some interesting moves in time.

I’ve seen this listed as a retrofitted alternate timeline story in Chandler’s Rim World series, but I haven’t read enough of that series to know where the FTL time machine would fit in. Stay tuned for updates.

Chandler’s widely traveled, spacefaring captain John Grimes had at least one adventure through time which he told to a pretty reporter named Kitty on the Rim World of Elsinore. It seems that when Grimes was a much younger spacehand on leave in his native Australia, he once ran into two former crewmates who had figured out how to project themselves and Grimes into their own nefarious ancestors in the 1880 outback.

I’m still searching for other time travel stories about Grimes or Chandler’s Rim Worlds.