The Defiant-class refit is not a true refit, rather, it is an experimental modification of the Defiant-class design. It was created by a group of Starfleet engineers who wanted to see how far they could push a Defiant-class shipís weapons and tactical systems. The changes made include:
Four forward facing rapid fire quantum torpedo launchers were added. These are a new design, capable of firing six torpedoes a second. They can use expelled warp plasma to accelerate the torpedoes, allowing the ship to fire while cloaked, but it can only fire one torpedo at a time in this mode, and the risk of detection increases. They also take up a great amount of space inside the ship.
The rear-facing torpedo launchers were removed and replaced with a single, multi-torpedo launcher, capable of firing one torpedo per second.
The pulse phasers have been replaced with Mk. III versions, which are slightly more powerful.
Three type V phaser strips have been added.
Deck 4, as well as the shuttlebay, was entirely removed. This is to allow a greater line-of-sight between the nacelles, which, in turn, gives it a tighter turning radius and better handling at warp speeds.
To compensate for the reduced space, the crew complement was reduced to thirty.
The entire crew quarters were changed to resemble those of a 20th century Earth submarine. These have the advantage of taking up less space.
A Captainís Yacht was added.
The entire Warhead was reworked and expanded. It now contains a pair of tri-cobalt devices with 28,000 Isotones total yield.
40 centimeters of ablative armor were installed on top of the original layer of armor.
New warp engines, designed to avoid subspace disturbances, were installed. These allow the ship to be harder to detect when cloaked.
The starboard mess hall replaced with Holodeck. Officially, this is so they may practice missions en route, unofficially it is because crews aboard normal Defiant-class ships often complained about the shipís lack of any recreational facilities.
A Romulan cloaking device was installed.
The first ship to be given these upgrades was the USS Mustang. It spent almost two years in dry-dock while being upgraded.
I designed this ship for my story Star Trek: Mustang. It chronicles the adventures of the Mustangís crew doing the Dominion war. Currently, I have only uploaded the pilot episode, but I will be uploading more chapters soon. The story can be found here: