Scylla class

The Scylla-class was a type of Federation class VI scout starship in Starfleet service in the 23rd century, becoming active on reference stardate 2/2208.

History and specifications
The Scylla was created in the late 23rd century as an attempt to propogate certain design technology developed for the starships, on a smaller scale. Scylla-class vessels crew 184 officers and men and could carry 135 SCU (standard cargo units), a capacity of 7,200 metric tons. The vessels unloaded massed around 68,875 metric tons. The Scylla measured 196 meters in length, 86.5 meters in width and 44 meters in height. The Scylla had two standard (6-person) personnel transporters and two 22-person escape transporter stages.

The Scylla warp engines were FWB-2 type, rated to cruise at warp factor 6 and max out at warp factor 7. The Scylla impulse engines were of the FIE type. The Scylla weapons consisted of three dual-emitter FH-4 phaser banks, a total of 6 phaser emitters, with forward, port and starboard firing arcs. The vessels had two FP-6 photon torpedo launcher with a forward firing arc. Scylla was defended by FSH model deflector shields.

The Scylla-class history began after experimental technology was being created for the Excelsior-class, but had not been extensively tested since the Excelsior project fell several years behind schedule and did not have a spaceworthy prototype. Because of the new technology visible in the ship's makeup, the Scylla vessels were not posted near Orion, Klingon or Romulan space for fear of becoming targets for espionage and capture. 

Background
It was specified that registry codes assigned to this class ranged from NCC-4105 to NCC-4110 without mentioning any ship names, although by the class nomenclature there would likely be a forefront prototype named USS Scylla.