Size
The dimensions of the
Constitution-class, being 947 feet (289 meters) long for the original configuration and 1000 feet (305 meters) for the refit-configuration, have been set in stone in time immemorial as far as
Star Trek -lore is concerned. That being said and oddly enough, neither dimension has actually ever been
canonically confirmed, as neither dimension was ever seen or referred to in any of the live-action
Star Trek productions.
[...]
Remarkably, the dimension of the starship had been in flux until that time as a Producer
Gene Roddenberry's memo of 24 August 1964 evidenced, "
We anticipate a final design might see the ship as 200 feet in length, and thus even a 1½-inch scale would give us quite a huge miniature." This figure, initially accompanied with a crew complement of 203 would actually more or less stand until Jefferies, utilizing his engineering background, recalculated the figures for his design three years later.
The original configuration
Constitution-class length came closest to canon, when two ship size comparison graphics were featured in the
Original Series third season episode "The Enterprise Incident". The two computer console graphics, also created by Jefferies, showed a
Constitution-class vessel in comparison with a
Romulan D7-class battle cruiser and an in the episode barely discernible yardstick. Yet, careful measurement of the production art of the graphic, using the featured yardstick, measured the
Constitution-class vessel actually at exactly 900 feet (274 meter). Jefferies later sold his original plan view design art, including that for AMT, in the
Profiles in History The Star Trek Auction of 12 December 2001, in order to raise funding for the "
Motion Picture & Television Fund" charity.