Hydra

The Mammoth Hydra is a military VTOL fighter jet featured in Grand Theft Auto: San Andreas, and as part of the Heists Update in Grand Theft Auto Online.

Design
The Hydra is a jet-powered military aircraft, bearing roundels of the United States Air Force on its wings. It is suggestively based on the British Aerospace Harrier II (Formerly known as the Hawker Siddley Harrier) a well-known British fighter jet with Vertical Takeoff and Landing (VTOL) capabilities. This is further proven by the cheat code that is used to spawn the jet in the PC version: "Jumpjet", which is a nickname for Harrier jets. The Hydra features the Harrier's VTOL system, as well as its weaponry, including missiles and countermeasures. The built-in machine gun of the Harrier, however, does not appear; instead, the machine gun is featured on another vehicle, the Hunter.

Combat
The Hydra is well-known for being one of the best performing in-game vehicles when it comes to combat, being on par with the Hunter. The Hydra comes with three sets of weapons:
 * Countermeasures: When used, the Hydra will drop a white flare that has the ability to deviate incoming heat-seeking missiles from enemy Hydras at high wanted levels, and the surface-to-air missiles of Area 69. It should be noted however that the flares will not put the Hydra in a safe situation entirely, as sometimes the missile may head towards the jet again after deviating for a few seconds. Shots fired from a Rocket Launcher cannot be deviated at all.
 * Missiles: When used, the Hydra will fire one unguided rocket per side. Despite being unguided, if correctly aimed (deadly when used with the downward thrusts), it will make short work of vehicles, blowing them up on contact (except for the Rhino). The missiles, if they do not hit anything, will travel a relatively long distance before blowing up.
 * Heat-seeking missiles: This alternative fire mode of the missiles is identical to the handheld Heat-Seeking Rocket Launcher. The Hydra can lock onto vehicles, and once it is done, any fired missile will be heat-seeking and will head towards the target. These missiles however are less powerful than the unguided missiles (requiring three missiles to destroy a car instead of a single rocket for the unguided missiles). When fired towards an aircraft, it will be much faster, and is likely to reach its target.

Design
The Hydra was originally going to be in Grand Theft Auto V, but it was replaced by the P-996 LAZER for unknown reasons. It was briefly seen flying over the city at the end of the first GTA V trailer, and was later shown in more detail shooting down a Police Maverick in the second trailer. It was distinguishable from the P-996 due to its shorter, vented fuselage and black-painted nose.

The Hydra is included in the Heists Update, similar to how other beta vehicles returned in DLCs. Like the San Andreas rendition, the jet is based largely on the British Aerospace Harrier II (Formerally known as the Hawker Siddley Harrier) however the nose, vertical fins and horizontal stabilizers resemble those of the F-35 Lightning II. The jet retains its Vertical Takeoff and Landing capabilities, allowing it to be flown in a hover mode akin to a helicopter, or flown as a plane. These modes can be changed by pressing right on the D-pad. It features identical armaments to the P-996; those being heat-seeking or free fire rockets, and two 30mm cannons.

Grand Theft Auto San Andreas
The Hydra is the most sophisticated aircraft in the GTA series, boasting a variety of equipment. One of its more prominent abilities is its VTOL(Vertical Take Off and Landing) capabilities, which allow it to hover, descend or ascend vertically like a helicopter, and travel horizontally like an airplane; these abilities are achieved by directing thrust from four jet outlets downwards or backward using specific directional controls (by pushing the right analog stick forward/back, or, on a PC, by holding down 2/8 on the number pad or Ins/Del, by default. Or, with the IOS version, snaps automatically forward at a moderate speed). Due to its excellent engine and maneuverability, the Hydra is the fastest and fail-deadly aircraft (and one of the fastest vehicles) in GTA San Andreas, with a fixed top speed of 200 kph, and one of the easiest to fly when the player learns the basics of fixed-wing flight. However, similar aircraft like the Rustler and the Stuntplane, are more agile. It is very complicated, one mistake can send it plummeting towards the ground.

The Hydra is the most preferred aircraft for its speed, agility, and weapons which make it an excellent choice for nearly any purpose requiring an airplane. Its chief disadvantage comes not from the vehicle itself, but the game engine - high-speed flight can allow the plane to hit objects, such as trees, before they've become visible due to model/texture loading being slower than the plane itself (this process is also nick-named 'pop-in'). Another drawback is that there is no passenger or co-pilot seat, restricting it to only carry one person, making it unsuitable for several-man transport.

Unlike the Hunter in GTA Vice City and GTA San Andreas,Vigilante side-missions cannot be started or performed using the Hydra.

Grand Theft Auto Online
Similar to the San Andreas rendition, the Hydra is able to switch between a vertical takeoff/landing mode and an horizontal one. When in horizontal flying mode, the Hydra is almost identical in performance to the P-996 Lazer, being able to reach very high speeds, having an excellent maneuverability, and being extremely responsive and able to quickly pitch, yaw and roll in any direction. Add to that a short take-off and landing distance which make the use of the VTOL mode optional on roads. The Hydra, however, is heavier than the Lazer, and as such, is a bit less manoeuvrable.

When in VTOL mode, the Hydra is surprisingly much more manoeuvrable than its previous rendition; the Hydra is easily controllable in this mode, and makes using the vehicle's weaponry much easier. However, caution should be taken when switching to the VTOL mode, as unlike San Andreas, it may take a while before the Hydra flies vertically; as such, the player should not try to land it immediately, doing so will usually cause the aircraft to crash.

Overall, the Hydra can be considered as a VTOL counterpart to the Lazer. Despite being a bit heavier, the VTOL features make the Hydra a very deadly aircraft with its weaponry, which is partially balanced by the fact that the vehicle is not available outright to players Online.

GTA San Andreas

 * Vertical Bird

GTA Online

 * Humane Labs Raid - GTA Online Heist

GTA San Andreas

 * Easter Basin Naval Station: Available on the aircraft carrier after completing Vertical Bird, the player instantly gains a 5-star wanted level upon entry of the base, then stealing will cause the player to be chased down by NPC Hydras.
 * Verdant Meadows: In the hangar furthest away from the Abandoned AC Tower after the mission Vertical Bird.
 * Ganton: On Sweet's House rooftop after attaining 100% completion.
 * Area 69: Two spawn by a tank garage after Vertical Bird (dangerous to obtain, even if you use the 'lock wanted level' cheat code at zero stars; Surface to Air Missiles will still shoot at the player unless the player takes them out with Satchel Charges).
 * 2 NPC Hydras pursue the player when in the air after reaching a 4-star wanted level; although it's extremely difficult as the wreck is likely to disappear and you are likely to get Busted, you can attain 6-star wanted level, shoot down one of them with a Rustler or Hunter, theoretically even a Sea Sparrow, as close as possible to Verdant Meadows (this is the easy part), land and bail out next to the wreck, jack a nearby Rhino and use it to push the wreck into your hangar.
 * The Hydra can be obtained with the cheat code "jumpjet" for PC. For other consoles, see Cheats in GTA San Andreas.

GTA Online

 * Aircraft Carrier 96 in preparation for The Humane Labs Raid.
 * Can be bought from Warstock Cache and Carry for $3,000,000.

Glitches

 * There is a glitch that occasionally occurs with the flares; at times they do not deploy. You would then have to rely on the Hydra's evasiveness in order to avoid incoming missiles (hint: if you are flying at a high enough altitude, you can roll your Hydra upside down, then pull up. You will almost certainly evade the missile. If it is too high to dive, then use the rudder and turn at the same time.)
 * If you go to the Mount Chiliad (where a Mountain Bike appears) with the Hydra, if you start to lock-on over it and fire the missiles, oddly the Hydra receives damage until it explodes like if you are being attacked. This is due to the fact that bicycles aren't meant to explode and it will glitch the damage values, like a "bouncing" damage that affects the Hydra. (PS2 Confirmed)

General

 * The Hydra is named after a Greek mythological beast, a 9 headed serpent-like creature that lived in Lake Lerna on the Pelopennese Island in Greece. Other vehicles named after mythological creatures include the Leviathan, Phoenix, Banshee and Kraken.
 * Both of its introductory missions are very similar. They both involve the player stealing the VTOL from an aircraft carrier after a shootout with military personnel, only to use it for another ultimate purpose.

GTA San Andreas

 * Once the player attains a 4 star wanted level or higher and is in the air, two Hydras will pursue and try to shoot down the player. The enemy Hydras should be no match, as they have a penchant for flying in lazy circles and not deploying flares, and as a result they will easily crash into buildings when flying in cities.
 * [[Image:DMAHydra.jpg|thumb|190px|The lettering on the rear fuselage.]]Part of the text on the side of the aircraft features the letters "DMA", this is likely a reference to Rockstar North, since the company was formerly known as DMA Design. DMA is also a play on United States Marine Corps squadrons that use the AV-8B Harrier II (VMA).
 * The Hydra has a U.S. Air Force logo on its left wing, but on the right wing, it does not.
 * The Hydra has a handling similar to that of a helicopter if the thrusters are not faced backwards.
 * An alternative model of the aircraft can be seen on one of Zero's hobby shop kits, sporting a V-tail and a more Harrier-esque look.
 * Hydra model kit.jpg all other planes in the game, the Hydra will cease to accelerate once it reaches 300 km/h. However, several trainers (such as the SCM hook) can disable the cessation.
 * The NPC Hydras chasing CJ in a dogfight are actually piloted by police officers from the city/region that they spawned from.
 * If the player enters the Hydra with the landing gears retracted, upon entering the plane, the Hydra will explode.

Grand Theft Auto V

 * The Hydra cut before the release can be seen in the in-game TV Cunning Stunt Academy, with various features, such a black narrow nose, Harrier-like landing gears (which is oddly short) and 2 thrusters in a side (like a Harrier) and a rear main turbine (like the Lazer).
 * The Hydra is described by the Heist Planner to be a piece of 40-years old technology, yet it is fairly comparable to the Lazer in design and performance. This may simply be a mis-statement on his part, or  because the real world jumpjet system is developed in the 1960s and introduced into the United States in the 1970s.
 * The mission objective Hydra in the preparation mission curiously has the EMP device installed inside its nacelle, where its radar would logically be,yet it can still lock missiles onto incoming enemy aircrafts. This may be a gameplay design oversight, or a referrence to the infamous "Blue Circle" concrete radar placeholder equipped by British aircrafts in the 1970s and 1980s.

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