Yorktown class

The is slightly smaller than the , which the ship is derived from. However, the Yorktown, does still serve as a frontline explorer and flagship with an emphasis on diplomatic and command capabilities. In service, she has complemented leaner, more efficient explorers, like the and the , by providing advanced long-range communications and command functions, engineering, and technical support. Similar to the Odyssey-class, the Yorktown-class also featured medical facilities previously only found on Starbases.
== Mission objectives ==
Pursuant to Starfleet Exploration Directives 902.3 & 914.5, Starfleet Defense Directives 138.6, 141.1, & 154.7, and Federation Security Council General Policy, the following objectives have been established for a Yorktown-class starship.
# Provide a multi-mission mobile platform for a wide range of scientific and explorative research projects.
# Provide autonomous capability for full execution of Federation defensive, cultural, scientific, and explorative policy in deep space or border territory.
# Serve as a frontline support vehicle during times of war and emergencies.
# Provide a mobile forward operating base for humanitarian aid missions.
# Provide a mobile facility for diplomatic functions.
# Supplement and eventually replace the , , Ross-class, and Odyssey-class.
== Features ==
=== Propulsion ===
The Yorktown-class was equipped with multiple types of propulsion systems, including a matter/antimatter warp core, primary and secondary impulse engines, and impulse thrusters. The class was certified for a regular cruising speed of warp 8.5, a maximum speed of warp 9.8, and an emergency speed of warp 9.99 for a period of 12 hours. Once Warp 9.99 had been held for 12 hours, the ship automatically dropped to Warp 8.5 to "cooloff" this process could not be overwritten.
The primary and secondary impulse engines were capable of making the Yorktown-class travel at sublight speeds up to 0.333c, while the impulse thrusters were only capable of 0.002c.
==== Speed, Distance, & Time ====
* Traveling at Warp 8.5: 1 ly per 7 hours or 0.14 ly per hour
* Traveling at Warp 9.8: 1 ly per 3.58 hours or 0.28 ly per hour
* Traveling at Warp 9.99: 1 ly per 1.11 or 0.9 ly per hour
** Maximum distance @ Warp 9.99: 10.83 light years
=== Armaments ===
==== Phasers ====
Mark XIV phasers, when set to maximum power, gave off the heat equivalent of 4,000 celsius.
==== Torpedoes ====
Photon torpedoes utilized antimatter explosions. The following are a unit of antimatter and the amount of destructive force in contains.
* 1 ounce: 1.22 megatons
* 1 pound: 19.52 megatons
* 1 kilogram: 42.96 megatons
* 1 ton: 39,040 megatons (39.04 gigatons)