Yamato class

## SPACECRAFT CLASS

Development project patch (Thomas Marrone)

The ***Yamato*-class**, named after one of the first *Galaxy*-class vessels, was a type of spacecraft developed by Starfleet in the early 25th century. It was derived from the *Federation*-class and was designed concurrently with the *Andromeda*-class.

## History

Designed concurrently with the *Andromeda*-class, the *Yamato*-class was an upgrade to the *Federation*-class dreadnought that was so successful during the early years of the Last Federation-Klingon War.

Following the success of the *Pathfinder*-class in Operation Delta Rising, designers in the Advanced Starship Design Bureau began work on updates of other core ship designs in the Federation fleet. The first two designs to come from this effort were the *Andromeda*-class, a subclass of the decades-old *Galaxy*-class design, and the *Yamato*-class, an update to the *Galaxy*-derived dreadnought.

Vessels of both classes were constructed simultaneously, but due to the additional armaments and their connected systems, the first *Yamato*-class starship did not launch until months after the *Andromeda* prototype.

## Technical specifications

### Physical arrangement

The *Yamato*-class was 700 meters in length. Holding an M-class environmental standard, starships of the class carried a complement of 800, with a maximum evacuation capacity of 12,000. The decrease in required crew was due to high efficiency in the *Yamato* design prompted by a push from Starfleet Command for starships requiring less personnel.

Like its parent design, the *Yamato*-class was developed with the ability to reversibly separate the primary and secondary hulls in what was called saucer separation, often truncated sau-sep. In this maneuver, the primary hull would disconnect near the top of the stardrive. The original concept was that in dangerous or emergency situations, non-essential personnel could be evacuated to the saucer and the secondary hull could be commanded from the battle bridge, located on Deck 11. While this remained true for the Yamato design, designers planned a secondary purpose: the ability to increase the maneuverability of the separated parts and increase tactical options.

In order to serve on the bridge of an *Yamato*-class starship, officers had to pass the Saucer Separation Clearance Exam in addition to the standard Bridge Officer's Test.

#### Deck plan

The following was the standard layout for *Yamato*-class vessels.

### Propulsion systems

A Yoyodyne 47A Matter/Anti-Matter Reaction Assembly powered the *Yamato*-class and was connected to three Cochrane Type 11K7 Variable Warp Drive Nacelles and the starship's three impulse engines, its primary HeliosCorp G90 Hyper Subatomic Unified Energy Impulse Engine and two secondary Inline Flux Mk45 Subatomic Unified Energy Impulse Engines.

The class also carried a single Rigel Labs X06-A quantum slipstream field projector, which allowed each vessel to travel at slipstream speeds exceeding 300 light years per hour. However, due to power limitations at the time, the drive could only be operated for 30 minutes before needing a 60 minute recharge.

An Ithra IT-5 Transwarp Coil allowed *Yamato*-class starships to connect to the Federation Transwarp Network and jump to gateways within the network at speeds of 360,000 light years per hour. The system had massive power needs, even more than the quantum slipstream drive. To power the coil, starships had to divert energy from weapon and shield systems. Due to strains on the IT-5 coil, it could only be used once every 20 hours.

### Science and remote sensing systems

To add to the sensor capabilities of the class, multiple Multidifferential-multispectral (MDMS) Passive Sensor Vanes were placed on the dorsal section of the secondary hull beneath the secondary impulse engines.

### Tactical systems

The phaser system of the class were designed to project a Molecular Cohesion Nullifier Field (MCNF) around the arrays. Though the system could only be activated for a short time, it would amplify the power of phaser beams, allowing them to inflict enhanced damage to a target. Due to the power requirements and intricacies of the system it was only ever implemented in the *Yamato*-class and its simbling *Andromeda*-class.

### Crew support systems

Holographic projectors were equipped throughout *Yamato*-class vessels, which allowed for emergency holograms to be quickly activated at any location in a time of need. Each starship's Zimmerman HS-5.3 photonic core stored the programs for 5 Emergency Medical Holograms, 5 Emergency Engineering Holograms, 18 Emergency Security Holograms, and a single Emergency Command Hologram.

## Derivatives

As with the *Andromeda*-class, the *Yamato* design eventually received a significant refit with the *Sirius*-class. This included the addition of a secondary navigational deflector at the forward edge of the primary hull, a slimming of the secondary hull, and updated warp nacelles and pylons.

## Appendices

### Connections

**Project groups:** **Union Station** (*Geneva* • *Concorde* • *Presidio*) • **Century Cruiser** (*Springfield* • *New Orleans* • *Challenger* • *Niagara* • *Freedom II* • *Galaxy* • *Nebula* • *Cheyenne*) • **Multi-Mission explorers** (*Brigid* • *Esquiline* • *Palatine*) • **Deep Shadow** (*Eclipse* • *Phantom* • *Scryer*) • **Miracle Worker** (*Scott* • *Daystrom* • *Tucker* • *Gagarin*) • **Aeronaut** (*Mercury* • *Ajax* • *Icarus* • *Shran*)

**Other named classes:** *Aegian* • *Aerie* • *Akula* • *Atlas* • *California* • *Centaur* • *Challenger* • *Cheyenne* • *Constellation* • *Constitution III* • *Crossfield* • *Curry* • *Daedalus* • *Dauntless* • *Excelsior II* • *Freedom II* • *Gemini* • *Glenn* • *Guardian* • *Inquiry* • *Iwo Jima* • *Jupiter* • *Lexington* • *Niagara* • *Obena* • *Okinawa* • *Parliament* • *Perseus* • *Pioneer* • *Ranger* • *Sagan* • *Solanae* • *Springfield* • *Turing* • *Ulysses*

**Auxiliary craft:** *Aero* • Class C • Class F • *Danube* • *Flyer* • *Gondola* • *Kodai* • *Mollard* • *Peregrine* • *Selenic* • Type 4 • Type 5 • Type 6 (Type 6A • Type 6S) • Type 7 • Type 8 • Type 9 (Type 9A) • Type 10 • Type 11 • Type 14 • Type 17 • Type 19 • *Valkyrie* • *Venture* • *Waverider* • *Yellowstone*

**Leadership:** Commander-in-chief • Joint Chiefs • Chief of Starfleet External Affairs • Chief of Starfleet Operations • Chief of Starfleet Research and Exploration • Chief of Starfleet Tactical

**Agencies:** Operations (Engineering • Judicial • Materiel Supply • Mission Operations • Personnel Management • Records Service • Shipyards Operations • Starbase Operations) • Research & Exploration (Science • Medical) • External Affairs • Tactical (Intelligence • Security • MACO)

**Notable units:** Ktarn Fleet • Task Force 77

**Facilities:** Deep Space K-7 • Deep Space K-13 • Deep Space 9 • Masamichi Array • Starbase 45-Keepsake • Starbase 82-Maat • Starbase 234-Beskerm • Starbase 247-Vershina

**Agencies:** Starfleet • Diplomatic Corps • Department of Temporal Investigations • Federation Security Agency

**Facilities:** 40 Eridani A Starfleet Construction Yards • Antares Ship Yards • Beta Antares Ship Yards • Copernicus Ship Yards • Laikan Starfleet Shipyards • McKinley Station • Memory Project • New Aberdeen Shipyards • Proxima Maintenance Yards • Salazaar Shipyards • San Francisco Fleet Yards • TL-9139 Starfleet Maintenance Yards • Tranquility Base • Utopia Planitia Fleet Yards

### Sources consulted

* Yamato class (dreadnought) article at *Memory Beta*.
* Yamato Dreadnought Cruiser article at the *Star Trek Online Wiki*.
* Yamato Class Dreadnought Cruiser artwork by Thomas Morrone posted at ArtStation.

### Footnotes

1. ↑ Derived from the MSD created by Dodye and posted to Reddit/r/sto.
2. ↑ *Star Trek Online Starships Collection* issue 03: "U.S.S. Andromeda NCC-92100."