DY class

General Overview
The DY-class is a family of space ship designs used by Earth throughout the 21st Century and 22nd Century. The first ship to be launched of this class was the DY-100-subclass interplanetary sleeper ship SS Botanny Bay, used by Khan Noonien Singh to escape the end of the Eugenics Wars in 1996. 

The DY-class continued to be upgraded and built upon for the next 120 years, including the addition of fusion impulse in the 2020s and warp drive in the 2060s. DY-class designs continued to be utilised well into the 22nd Century and 23rd Centuries, despite being replaced by the J-class in the 2110s. (: "Nuclear Time",, )

Subclasses
There are several subclasses of the DY-class.

DY-100
The DY-100 is proberbly the most famous of the DY-class vessels, manily because the SS Botanny Bay was of this class. The DY-100 was advanced for it's time, using several high classified tecnologies in it's construction. These included a nuclear fission powered ion drive for propulsion and an early form of Transparent Aluminium. As travel to its destination was scheduled to take months or even years, the ships of this class also carried cryo-stasis units for it's passengers. (TOS Novel: "")

DY-200
In the early 2020s, advacement in propusion engineering resulted in the creation of the DY-200 subclass. This ships now featured a fusion impulse drive system that was twice as efficiant as the DY-100's ion drive meaning that travel inside the solar system became less reliant on the ships cryo-stasis units. (: "Nuclear Time")

DY-300
Further improvement in the impulse drive system and a redesign of the DY-200's space frame in the 2040s resulted in the DY-300-class and was the first to carry the design of fusion impulse drive that was largely unchanged well into the 24th century. (: "Nuclear Time")

DY-430
Following Zephram Cochrane's successful warp flight in 2063 the DY-300-class was modified to include the first generation of warp drive, fueling Earth's first major period of extrasolar colonisation. (Novel:, : "Nuclear Time")

DY-500
During Earth's second major period of extrasolar colonisation the DY-500 class was used extensively. The sublcass included at least two varients, the DY-500-B and the DY-500-C. 

DY-1200
The last of the DY-class family of designs.(: "Nuclear Time")

Commisioned ships

 * SS Botanny Bay (DY-100)
 * SS Hatteras (DY-245)
 * BRS Argus (NAR-24) (DY-300)
 * SS Urusei Yatsura]] (DY-430)
 * SS Mariposa (DY-500)
 * SS Hokule'a (DY-500-B)
 * HMS Lord Nelson (DY-500-C)
 * VK Yuri Gagarin (DY-732)
 * HMS New Zealand (DY-732)
 * DEV Eagle Valley (DY-950)
 * VK Velikan (DY-1200)