The original 8-foot model of the Enterprise that was built by Industrial Light and magic was not used much during the series. For motion control work, the 4-foot model was much easier to use, is much more detailed, and, for far-away shots, itís easier to make it seem far away. The original     8-foot model was used only for extreme close-ups or for saucer separations. The 4-foot model was built by Greg Jein during the third season.

 There are actually a total of six Galaxy-Class starships. The first was the U.S.S. galaxy, second was the U.S.S. Yamato (destroyed), the third was the U.S.S. Enterprise (also      destroyed).