Fat Man (Fallout 3)

The Fat Man is a tactical nuclear catapult in Fallout 3.

Characteristics
The Fat Man is a pre-War heavy weapon that launches mini nukes. The mini nuke projectile is very heavy, and if simply fired straight ahead, it will travel only a short distance before falling to the ground and detonating (causing you to be caught well within the very damaging mini-nuclear blast). For optimal range, the Fat Man should be fired in V.A.T.S. mode at high skill levels (which automatically compensates for the projectile's downward trajectory), or at an upward angle to catapult the mini nuke further, so that it impacts at a safer distance.

The Fat Man has an estimated range of 150+ yards. The blast zone will be irradiated for a short time after detonation, giving out up to 5 rads/second.

Durability
The Fat Man's condition can wear down surprisingly fast with frequent use (though its firepower is still devastating at any state of repair). It can fire a total of about 167 mini nukes from full condition before breaking.

Variants

 * Experimental MIRV - An incredibly destructive weapon, the MIRV fires 8 mini nukes in a single shot.
 * Sim version - A sim-only version of the weapon, which has the same health.

Locations

 * Capitol Building, during or after the fight with the super mutant behemoth. One of the Talon mercs is armed with it, as well as a single mini nuke.
 * Evergreen Mills - at the top of the Foundry in a locked room.
 * Fort Bannister - in the Fort Bannister Main building in an Average locked room at the bottom of the concrete stairs.
 * Fort Constantine - along with 2 mini nukes. You will need all 3 of the special keys from the You Gotta Shoot 'Em in the Head quest to access the room.
 * GNR building plaza, on a dead Brotherhood soldier with 8 mini nukes, during the quest Following in His Footsteps. (The corpse of the Brotherhood soldier will not appear if the normal GNR quest is skipped and Sentinel Lyons is not encountered.)
 * Germantown Police HQ - in the basement armory in an Average locked closet near the firing range.
 * Olney sewers - in a small room in the center of the sewer. The same room has three locked safes and a missile launcher.
 * White House - in the ruins, near a skeleton. Next to the Fat Man are three mini nukes. The White House can be accessed from a Utility manhole at White House Plaza, south of the building on Pennsylvania Ave.
 * Flak and Shrapnel in Rivet City sell one.
 * The first time you go to Bannister crater after The Waters of Life, you will encounter an Enclave soldier carrying one, plus a mini nuke.
 * In a random encounter, a dead scavenger is carrying a Fat Man and a mini nuke.
 * Towards the end of the Operation: Anchorage! quest, four American soldiers with T-51b power armor will equip Fat Men, which can be knocked out of their hands or pickpocketed, and kept using the Gary 23 glitch.

Behind the scenes

 * The only real-world weapon remotely similar to the Fat Man is the M-388 Davy Crockett, developed by the United States during the Cold War. However, the Davy Crockett was not meant to be shoulder-fired, instead being set up on a tripod.
 * Fat Man was the codename for the atomic bomb that was detonated over Nagasaki, Japan by the United States on August 9, 1945.
 * Because of its relation to the real historic event, the weapon was renamed to the Nuka Launcher in the Japanese version of Fallout 3. It is, however, still referred to as the Fat Man in dialogue.
 * The bell heard after reloading is actually the lunch bell at Bethesda.