The more, the merrier though, Don. This one's shaping up fairly nicely.
Here's what I think: It's not impossible to have some form of FTL drive if you can do it in more than one way. Internal kinds of FTL drives from Borg vessels to other alien vessels. The standard pair(s) of cylindrical warp engines, rings... I think it's arrogance to think that the galaxy operates on "warp" drive anyhow. Perhaps similar FTL drives, but I don't think everyone outside Starfleet and the Federation operates on Warp Drive, aside from the usually-known Alpha Quadrant powers. Because the S.S. Enterprise was thought of before Enterprise, I somehow thought they might've tried some internal form of Warp drive. In the Ent-era's Quantum Reality, she could be using a similar design to the Vulcan "rings". Anything's possible.
Same with the DY series. I think the first ones was later a mid-21st century/22nd-century commercial designs, aside from the Botany Bay. Have any of you read the Eugenics Wars series by Greg Cox? It
brilliantly places the Eugenics Wars in the 1990s, with many character and tech tie-ins. If you ask me, I say that Greg Cox had a nice idea, that Gary Seven and Roberta Lincoln
had something to do with the DY-100 design (and that the engines were, as Ratboy explained it first), reverse-engineered Ferengi Impulse Engines, and that it was built somewhere around Area 51, etc.
And if you haven't read the books, why not go read 'em?
The Eugenics Wars: The Rise and Fall of Khan Noonien Singh - Volume 1The Eugenics Wars: The Rise and Fall of Khan Noonien Singh - Volume 2To Reign in Hell: The Exile of Khan Noonien SinghI've yet to read the third novel as it's newer, but the first two are
very good, in my opinion, and real exiting to read.