|Affiliation:||Klingon Defense Force|
|Armaments:||2+ heavy disruptor cannons, 1+ photon torpedo launcher|
The D5 class battle cruiser was a type of starship introduced by the Klingon Empire in the 2120s that served for over a century and a half. Some of the first Klingon ships fitted with cloaking devices were D5 battlecruisers serving in the 23rd century. (ST reference: Klingon Bird of Prey Owners' Workshop Manual)
These ships were a flexible design as they could be converted into tankers which could carry precious resources such as Deuterium. (ENT episode: Marauders). They also made use of multi-spectral sensors and were composed of diffused bonded monocrystal. (ENT episode: Judgment).
These ships appeared to have been in common use by the Klingon Defense Force at the time and were much more advanced than the United Earth Starfleet NX class vessels though the Human ships were capable of surviving battle for a short amount of time. (ENT episode: Judgment & Divergence).
They were armed with two large disruptor cannons located at the bottom of the central section of the main hull. These weapons were mounted on a type of turret platform which allowed the weapon to rotate and fire at enemy targets regardless of direction. (ENT episode: The Augments).
The D5 class served into the 23rd century, building on the existing mainstay of the Klingon fleet, the D4, and incorporating the first operational versions of newer technologies (e.g., dilithium power focusing). The experience gained with the D5s allowed these technologies to be integrated even better into later designs such as the D6 and D7. (TOS novel: The Final Reflection)