I would wager a hundred dollars the illustrator of this cover did the early Tom Swift Jr. covers. It's not just the style, it's the way he two-toned his machinery.

Review:

The cover of Fire in the Heavens features a spaceship pulling a string of sailing ships through interplanetary space. I assumed that was just a piece of artistic license -- the artist fancifully depicting the theme of the book. I was wrong -- the cover is a fairly accurate representation of an actual scene! That should tell you just how hokey this novel is.

In case anyone was confused by the ships and thought "is this space?" there's a ringed planet for reassurance.