Back in the first season of The Flash, we got introduced to a Time Sphere and Eobard Thawne (Tom Cavanagh) commented at the time that it, "Looks like Rip Hunter's ship." It looked like this:
And it was pretty true to the original comics, as you can see by this cover to Rip Hunter… Time Master #4 by Nick Cardy from 1961.
So how did we go from a single-seat bubble to the Waverider we see now? Did Rip (Arthur Darvill) hop around in the Time-Sphere for years but grabbed the bigger ship when he realized he was going to go get the Legends? All the stuff Rip has on the ship makes me doubt that one. I think Rip has had the Waverider for a while, which makes me wonder how Thawne had known about Rip and why he thought the Time-Sphere looked like the Waverider. As for the last part there, according to what executive producer Marc Guggenheim told EW.com, the topic had come up.
I would say it was taken into consideration in the design of the Waverider. The sphere that's in the front of the Waverider is meant to be an homage to the time sphere that we've seen on Flash and Legends. So make of that what you will.
Interesting. There is a sphere at the front of the ship. Maybe Rip is a bit of a DIY guy and started doing add-ons in his spare time.
DC's Legends of Tomorrow airs Tuesdays at 9 PM on the CW.