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{{ShipSpecs
|image= defiant2.jpg
|name= Defiant Class
|category= Escort
|duration= 45 Years
|resupply= 1 Year
|refit= 1 Year
|officers= 15
|enlisted= 35
|marines=
|passengers=
|evaccap=
|stardock=
|cruisevel= Warp 5
|maxvel= Warp 9
|emervel= Warp 9.52 (12 Hours)
|diameter=
|mainheight=
|overallheight=
|length= 120 Metres
|width= 90 Metres
|height= 25 Metres
|decks= 4
}}

==Description==

The ''Defiant'' class starship was officially classified as an escort, but began development in 2366 as a small, highly-powered, heavily-armed [[starship]] intended to defend the [[Federation]] against the [[Borg]]. The USS ''Defiant'' (NX-74205) was the first of what was to be a new Federation battle fleet. [[Starfleet]] abandoned the project when the Borg threat became less urgent and after design flaws turned up during the Defiant's shakedown cruise.

The ''Defiant'' prototype was pulled out of storage in 2371 when the [[Dominion]] threat emerged. After several upgrades by [[Operations]] Chief Miles O'Brien, the ship was deemed worthy of use and several more ships of the class were constructed.

==History==
The ''Defiant'' class [[starship]] is a heavily armed, limited-role [[Starfleet]] vessel, developed in response to the [[Borg]] threat as originally encountered in 2365, and spurred on by the shocking results of the [[Battle of Wolf 359]] in 2367. With the knowledge that existing weaponry and defenses would be inadequate to meet this threat, it was recognized that a new type of starship was needed to meet the [[tactical]] requirements of facing this superior enemy. Shortly after the massacre at Wolf 359 in 2367, [[Lieutenant Commander]] Benjamin Sisko joined the developing team at the [[Utopia Planatia Fleet Yards]].

===Design and construction history===
The USS ''Defiant'' (NX-74205) was the class' prototype. It was Starfleet's first dedicated combat vessel, and therefore did not house provision for families or diplomatic missions, nor science labs or recreational facilities.

The ''Defiant'' class was a heavily armored, stripped-down [[starship]] that was created as the first strike vehicle for use in war, and incorporated the latest in [[Starfleet]] weaponry and defensive technology. The ''Defiant'' class was also equipped with a class-7 [[warp drive]]. As befitted its role, the ''Defiant'' was considerably smaller than most other [[Federation]] starships.

The initial mission of the ''Defiant'' did not change radically until late 2370, when intelligence-gathering efforts had come upon the [[Jem'Hadar]] problem. In the final year of spaceworthiness testing (2371), the NX-74205 was redirected to starbase [[Deep Space 9]] to become a mobile defensive platform with orders to defend the station, the [[Bajoran wormhole|wormhole]], and the [[planet]] of [[Bajor]].

===Early service years===
Once the ''Defiant'' prototype had proven itself, [[Starfleet]] took the decision to put the ''Defiant'' class into production. By the end of 2373, there were a significant number of ''Defiant'' class ships in operation, and over the next two years they played a vital role in the [[Dominion War]].

===Dominion War===
The USS ''Defiant'' was destroyed by a [[Frigate class|Breen warship]] in 2375, during the [[Dominion War| Second Battle of Chin'toka]]. Another ''Defiant'' class ship, the USS ''São Paulo'', was assigned to Deep Space 9. Given the USS ''Defiant's'' exceptional record under [[Captain]] Benjamin Sisko's command, the Chief of Starfleet Operations gave a special dispensation to change the ship's name to ''Defiant''. On this ship, the [[shield]] generators were completely reconfigured so that it would not be affected by the [[Breen]]s energy-dampening weapon. This new ''Defiant'' played a distinguished role in the final battle with the [[Dominion]] at [[Cardassia Prime]], and remained stationed at Deep Space 9.

==Technical Data==
===Physical arrangement===
''Defiant''-class vessels were constructed of standard [[Tritanium]] and [[Duranium]] alloys and composites. The [[bridge]] had been submerged within a larger Deck 1 than was envisioned for the pathfinder vehicle, and the entire vessel had been shortened to four decks plus allowances for crawlways and cable trunks. The notched forward hull had been equipped with a detachable pod consisting of the vehicle's main [[sensor]] and [[Deflector|navigational deflector]], airlock module, and a last-resort [[matter]]-[[antimatter]] warhead. The [[nacelle|warp nacelles]] had been brought inboard to a minimum safe distance for field EM, and all EPS weapon-power conduits had been truncated to provide a nearly zero lag time between activation signal and beam launch.

All protected internal systems that required access to the vessel exterior were equipped with articulated or jettisonable hull plates, so that most of the familiar structures were hidden from view, including shuttlebay doors, docking ports, lifeboats and impulse vents.

===Propulsion systems===
''Defiant'' class ships achieved warp flight through two warp nacelles, which housed multiple pairs of [[warp coil]]s. The [[warp core]] spanned three decks in the aft section of the ship. The Class-7 [[warp drive]] was extremely powerful for a ship of this size, and as such, ''Defiant''-class vessels put out a warp signature equivalent to much larger starships.

The primary [[Impulse engine|impulse system]] consisted of three pairs of redundant fusion reactors, space-time driver coils, and vectored exhaust directors. All three main impulse engines were located on both Decks 2 and 3.

===Tactical systems===
====Pulse phaser cannons====
A total of four [[Phaser technology|pulse phaser cannon]] assemblies were located in forward-facing locations onboard ''Defiant'' class vessels. The cannons were located above and below the [[nacelle]] root attachments on the main body on both port and starboard sides of the ship. Due to the ship’s extreme maneuverability, yard engineers deemed it unnecessary to mount aft-facing cannons onboard vessels of this class.

====Phaser beam emitters====
The standard [[Phaser technology|phaser beam emitter]]s aboard ''Defiant'' class vessels served almost as a secondary supplement to the primary pulse phaser cannons. The vessel's two emitters were located behind the [[Bridge]] on the dorsal surface, and behind the shuttlebay doors on the ventral surface.

The ''Defiant'' class vessels [[deflector]] arrays can also be refitted into a makeshift phaser emitter, providing one shot capability in extreme emergency. The phaser emission is generated by the nose/deflector unit.

====Torpedo launchers====
''Defiant'' class vessels have a total of three [[torpedo launcher]]s, two forward and one aft. These are located one forward on the hull just ahead of each of the warp [[nacelle]]s. The rear launcher is located tucked in near the back end of the warp nacelles.

Along with the [[Sovereign class]], ''Defiant'' class vessels were initially the only starships in the fleet normally outfitted with [[quantum torpedo]]es. But like all Starfleet vessels, the launchers onboard a ''Defiant''-class [[starship]]s were capable of firing standard [[photon torpedo]]es as well.

====Deflector shields====
The ''Defiant'' class carries a total of four [[shield]] generators located throughout the vehicle space frame. The forward-most generator was located along the vehicle centerline within the warhead section. Two additional generators were located further within the hull from the warp nacelles, port and starboard, while the final generator was located on the centerline just above the main [[impulse engine]]s and forward of the deuterium storage tanks on Deck 1.

====Ablative armor====
Defensive energy [[shield]]s were not the only protection the Defiant class has against enemy fire; the hull was also plated with [[ablative armour]].

The ''Defiant's'' outer body is coated with ablative armour hull plating, a top-secret technology that had been in development for a number of years. Ablative armour provides an extra layer of defense for the vessel against enemy fire if the [[shield]]s failed. It works by forming a protective layer over the hull surface that helped disperse large amounts of incoming phaser blasts. Ablative armour dissipates phaser fire, minimizing the damage to the ship.

====Warhead====
With the addition of the warhead component aboard the ''Defiant'' class, yet another radical departure has been made from [[Starfleet]]s standard policy concerning tactical operations. Designed as a single-use last-ditch explosive component, usage of the warhead weighs as heavily upon a ship's [[Commanding Officer]] as the possible order to initiate self-destruct.

Housed at the forward-most portion of the ship, the warhead contained the ship's main navigational deflector, forward [[torpedo launcher]] and magazine, forward [[Airlock]]s, and dedicated [[impulse engine]]s for independent powered flight. Access to this area was provided by two walkways on Decks 2 and 3 where miniaturized versions of the standard airlock provided sealable entry between the main vehicle and the warhead. A dedicated control room was located on Deck 2 and allowed for both user operated and automatic control of the warhead.

Typically used when the vessel was totally disabled, it should be noted that once the warhead was launched it could not be reattached to its parent craft without the assistance of a starbase equipped to handle small starships. Once the order was given, the warhead section would separate from the parent spaceframe by means of four explosive bolts that served to provide the initial forward momentum for the pod before it engaged its own engines. Once free from the ship, the warhead would automatically arm all remaining torpedoes present in the launcher storage area. [[Computer]] projections indicated that the entire warhead vehicle would be destroyed in the resulting collision between it and its target. Due to space restrictions, no escape pods were present in the warhead section, meaning any crewmembers aboard tending to the vehicle would perish in the resulting explosion. Without its main deflector dish, the ''Defiant'' class vessel would be unable to engage in high-warp speed travel.

===Cloaking device===
The ''Defiant'' class was unique in a number of ways, not least because it was the first [[Federation]] vessel fitted with a [[cloaking device]].

The [[Romulan]]s loaned a cloaking device to the USS ''Defiant'' in exchange for the intelligence Starfleet had gathered on the [[Dominion]]. It was soon found that the [[cloaking device]] had drawbacks as it could be penetrated by certain types of antiproton beams. The ''Defiant'' was especially vulnerable as it put out a high power signature that was difficult to mask fully. However, it worked well enough to provide a major tactical advantage over [[Jem'Hadar]] ships.

==Ships Commissioned==
*USS ''Defiant'' (NX-74205)
*USS ''São Paulo'', renamed USS ''Defiant'' (NCC-75633)
*USS ''Valiant'' (NCC-74210)
*[[USS Tripoli]] (NCC-75607)

==Auxiliary Craft==
Shuttlebays: 1

Shuttles
:[[Type 10 class|Type 10 Shuttle]]: 1
:[[Type 18 class|Type 18 Shuttlepod]]: 2

==Armament==
Defensive Systems
:[[Ablative armour|Ablative Armour]]
:[[Cloaking device|Cloaking Device]]
Phasers
:[[Type U|Type U Pulse]]: 4
:[[Type X|Type X Array]]: 2
Shielding Systems
:[[Auto-modulating shields|Auto- Modulating Shields]]
:[[Metaphasic shielding|Metaphasic Shielding]]
Torpedoes
:[[Pulse-fire torpedo launcher|Pulse-Fire Torpedo Launcher]]: 3
::[[Quantum torpedo|Quantum Torpedoes]]: 57
::[[Photon torpedo|Photon Torpedoes]]:29
::[[Polaron torpedo|Polaron Torpedoes]]:4
:[[Tri-cobalt torpedo|Tri-Cobalt Devices]]: 4

'''The Defiant has a 5th sub-deck below the 4th deck in the nacelles for maintenance access.<br>
<br>
Please note, due to design limitations, the Defiant class cannot land on a planetary body. It is also unsuited for atmospheric flight, and this should be avoided wherever possible. Landing struts are primarily used while docked internally with a large starbase.'''

==Deck Listing==

{| border="1"
|+
|-
!Deck || Items
|-
|Deck 1 || [[Bridge|Main Bridge]], [[Captain's Ready Room]], [[Transporter|Transporter Room]] 1, Pulse Phaser Cannon (2), [[Main Engineering|Upper Main Engineering]], Plasma Exhaust Vents, Upper [[Sensor Array]], [[Officer's Quarters|Officer]] and [[Crew Quarters]], [[Escape Pods]], [[Deuterium Storage]]
|-
|Deck 2 || [[Main Engineering|Lower Main Engineering]], [[Impulse engine|Main Impulse Engines]], [[Computer Core]] (Level 1), Targeting Sensors, [[Torpedo Magazine]]s, Forward Torpedo Launchers (2), [[Mess Hall]], Warp Coils, [[Medical Laboratories|Med]]/[[Science Lab]], [[Sickbay]], [[Transporter|Transporter Room]] 2, Officer and Crew Quarters, [[Deflector Control]] Room
|-
|Deck 3 || [[Impulse engine|Main Impulse Engines]], [[Auxiliary Craft Maintenance]] and [[Auxiliary craft elevator]] System, [[Computer Core]] (Level 2), [[Antimatter Storage]], [[Cargo Bay]]s 1-4, [[Airlock]]s (2), Torpedo Magazine, Warp Coils
|-
|Deck 4 || [[Landing Strut]]s, [[Navigational deflector]], Pulse Phaser Cannon (2), Aft Torpedo Launcher, Probe Launcher, Lower Sensor Array, Shuttlebay Exterior Doors and Elevator System, [[Tractor beam]] Emitters, Warp Coils
|}

{{Ships}}

[[Category:Ship class]]

Defiant class - Revision history

Thedrew: 1 revision imported

Thedrew at 15:24, 3 June 2016