Traveler generational ships are interstellar vessels built and used by the Travelers as shelter for their entire civilization. They serve a purpose similar to that of Wraith Hive ships and Ancient City-ships, although on a much smaller scale.
Traveler ships share a relatively symmetrical design. They are mostly flat, with a raised area near the rear of the vessel. Two prominent sublight engines are mounted on the rear, instead of being built into the vessel as they are on most ships. They are smaller than most capital ships, being roughly half the size of a Daedalus-class vessel. They are hyperspace-capable and equipped with both shields and energy weapons.
Travelers live aboard their ships, being an entirely space-faring race. Thus, their ships are designed to house as many people as possible, though their total crew compliment is unlikely to be very high given their size. Because the Travelers lack the ability to build new ships, their current fleet is the total capacity of their entire civilization.
Because they remain in space the majority of their lives, Travelers seldom land their ships for repairs. Thus, their ships are largely kept operational by a large amount of "jury rigging". This makes individual ship performance within their fleet inconsistent. (SGA: "Travelers", "Be All My Sins Remember'd", "The Lost Tribe")
Traveler ships possess a wide range of technologies common to space-faring races. Their ships are equipped with hyperdrives,shown only to be capable of interstellar travel and are of variable speed. Katana Labrea says her ship is faster than any other in Travelers fleet (it is unknown if she includes the Aurora-class battleship in this comparison). Their hyperdrives run on more primitive wires and chips as opposed to control crystals, and are built from mismatching components. Though unstable, they are remarkably durable considering their construction, as Mila, the engineer on Katana Labrea's ship was able to restore hyperdrive functionality, at least momentarily, only minutes after overloading the drive to reach their destination faster.
Traveler ships have shields capable of resisting several shots from the main weapon of a Vanir spaceship. (SGA: "The Lost Tribe") They are also capable of withstanding fire from the pulse weapons of an Aurora-class battleship, though they will fail after sustained fire; during the Battle of Asuras, a Traveler ship was one of the few non-Asuran ships lost during the engagement. (SGA: "Be All My Sins Remember'd", "The Lost Tribe") These ships also possess energy weapons capable of destroying a Vanir ship within 10 shots. (SGA: "The Lost Tribe")
In 2007, Lt. Colonel John Sheppard's Puddle Jumper was disabled by a generational ship while he was on his way back to Atlantis after a resupply mission. After being questioned and unsuccessfully hijacking their Aurora-class battleship, he was released, leaving the ship in his Puddle Jumper while the Traveler fleet left with the Aurora-class battleship. (SGA: "Travelers")
During the Battle of Asuras, six generational ships and the Aurora-class battleship joined the Daedalus, Apollo and seven Wraith Hive ships to defeat the Asurans. One generational ship was lost. (SGA: "Be All My Sins Remember'd")
During the Battle of M6H-987, one Traveler ship, commanded by Katana Labrea, successfully engaged and destroyed two Vanir ships. After the battle, the ship opened a hyperspace window large enough to encompass the Daedalus, preventing its collision with Janus' research outpost by taking both ships through the planet. After the Daedalus was safe, the ship fired at the outpost on the planet, destroying it and the Attero device. Because it had sustained moderate damage, the ship was taken to Atlantis where it was repaired with the help of Dr. Radek Zelenka. (SGA: "The Lost Tribe")