The Voyager class was a low cost refit of the final 20 Vindicator class Frigates, using the same concept as the Constitution class based Endeavour class. The Vickers SCNN self contained Linear Warp drives offered a way to update relatively new hulls in a more affordable way, which was also far quicker than the full scale rebuild option.
The Voyager class served loyally for 30 years, latterly in second line duties. Although deemed old fashioned by some they performed valuable work, and were surprisingly sought after postings as they retained the older style internal and external aesthetic and use of space until their eventual retirement.
Based on Vindicator from Jackills Starship Data Sheet and Endeavour from Ships of the Starlet Vol 1
The Vindicator class of 2261 was a development of the Anton/Miranda Class Cruiser and Surya/Coventry Class Frigate platform. A more compact looking vessel than its earlier forebears the Vindicator mounted its warp drives closer to the primary hull on much more substantial mounts. This modification of the design was based upon after action feedback from various vessels of the family that had been engaged in the Four years war.
The Vindicator class was the last twin engine version of this basic design platform produced before the adoption of the Linear Warp Drive (the later Durrett prototype being single engined).
Like many of the other ships of this overall design family, many of the Vindicator class ships were extensively rebuilt to form part of the refitted Miranda class in the 2270s and 2280s. However, the 20 newest ships of the class were rebuilt much like the Endeavour refit of the Constitution class with Vickers SCNN Linear Warp Nacelles to form the Voyager Class which continued in service until the early 2300s.
The Coventry differed from the Surya by having an extended rear edge to the primary hull to house extended hangar decks. These hangars often carried Attack ships as well as the more usual shuttles. Some ships of this class served 50 years in the fleet.
The Sheffield Class was built in very small numbers as it was a victim of technical progress.
Intended to supplement the Surya and Coventry class Frigates, the USS Sheffield Commissioned in October 2266, and a class of 30 ships was envisaged to allow the replacement of the remaining Asia class ships. However while the Sheffield was being tested Starfleet started to bring Linear warp drives into the inventory. The Sheffield’s design was assessed and it was found that the changes from the standard Coventry class design made the ship less suitable for use with the linear drive nacelles and warp core.
As a result only 7 further Sheffields were completed, the remaining 22 were cancelled in favour of additional ships of the new Babcock class.
The Delta Class was an off shoot from the Perimeter Action Ship program, initially designed n response to the requirement that led to the building of the Kiaga class PA, the design was put into limited production as a light frigate. The Delta was a relatively small vessel, with a very flat side profile which was intended to increase the stealthiness of the design. Only 12 Deltas were built, but they were intended for gathering intelligence in locations were the use of a specialist intelligence gathering ship was not possible for political or tactical reasons.
The Surya class was designed as a Frigate counterpart for the the Constitution class. The ships had useful hanger capacity in the rear of the primary hull, and, along with the Miranda class, set the basics for classes to follow from the Coventry through to the Avenger/Reliant.