Danger, Will Robinson - S1-E10
[Radio beeping in Morse code]
John Robinson: It's Morse code.
Don West: What's he spelling?
John: F.
Don: OK.
John: U.
Don: "FU"? That's his message? "FU"? This is how your kids talk?
John: E.
Don: OK, that changes everything.
John: L.
Don: Fuel! They have fuel.
John: Hey, they got fuel!
Don: Yeah! Yeah. So if we'd just waited a couple hours, we wouldn't be here. Great.
Answer: The Fortuna didn't have an Alien Engine. The cover story was the Fortuna was to explore Alpha Centauri but it was exploring the rift. The rift is what the Alien Engine creates and explains how the Fortuna was able to travel to a distant planet (what you call "galactic travel").
Bishop73