The benefit was a superstructure that was extremely resilient to weapons fire and even collision damage from rebel ships. What was not as common was that about a dozen of the Halcyon-class vessels were modified during initial construction at the Reyes-McLees Shipyards with an experimental framework of interstitial honeycombed framing members. This is actually common for all UNSC ship construction. The internal skeletal structure of the Halcyon-class cruiser was primarily made from carbon-molybdenum (C-Mo) I-beams. Skeletal Structure Interstitial Honeycomb All massive vessels of this size and greater are built in zero-G environments, usually in orbit of a planet or moon. Atmospheric flight was limited to much smaller vessels. Ships of the Halcyon-class' tonnage were not designed to operate within a planet's atmosphere.
In the event the ship was too crippled to move under its own power, another UNSC ship could dock with it and ferry it from a combat zone to safety. The ship's engine baffles are made from vanadium steel.Īs with all modern UNSC ships, the Halcyon-class was designed with structural hardpoints on its dorsal and ventral surfaces.
Normally a silver-colored alloy, uncoated, it turns white if exposed to solar radiation. Another major hull metal was a TR steel alloy. The chemical name for this armor is known as Titanuim-50 (Ti-50) one of several stable isotopes of titanium. Spacecraft Structure External Structure Hull Layers/MaterialsĪs is standard on all UNSC warships, the cruiser's outer hull was constructed from dense Titanium-A armor battle plate. The ship was destroyed several days later by an intentional destabilization of its reactor anticipated to destroy the ringworld and prevent the spread of a parasitic species discovered on the surface of the ring. Most of the ship's complement was evacuated prior to the its touchdown via dropships, lifepods and HEVs, which included the Autumn's standard crew, a contingent of Marines, and one of the only known remaining Spartan-IIs. After another engagement with the Covenant, the Pillar of Autumn's commanding officer, Captain Jacob Keyes, ordered the damaged ship onto the surface of the ring in a somewhat-controlled crash landing. This led the Autumn and crew to a star system containing a derelict ringworld of alien origin. Although they were required to plot a random non-colony-vectored course out of the system, according to the Cole Protocol, the ship's mission AI, Cortana, programmed a stellar vector based on a set of coordinates found on an alien artifact. When Reach's defeat was inevitable, the Pillar of Autumn activated its Slipspace drive to flee the system to avoid capture. The Autumn was in the system and saw her fair share of combat against the Covenant. That mission was suspended when the Covenant found and attacked Reach, the UNSC's primary naval base of operations and shipyards. It was refitted for a newer mission in 2552 to try to put an end to the Covenant war by capturing a member of the Covenant leadership and forcing a cease to hostilities. Later in its operational life, the Autumn did see some action in the combat theatre near Zeta Doradus (Onyx) in 2550.
Only her sister ship Dawn Under Heaven had almost as remarkable a history. Of the 50 Halcyon-class cruisers constructed, one of the most noteworthy was the SCS Pillar of Autumn. Due to some experimental architecture in eleven ships of the class, these cruisers could hold their own in a firefight when many larger ships would have been too badly damaged to continue fighting. The smallest human warship to receive the designation of cruiser, these still-enormous vessels exceeded a kilometer in overall length. The Halcyon-class cruiser was a mainstay of the UNSC fleet for about half a century. SCS Pillar of Autumn History of the ClassĪ UNSC cruiser was the most powerful warship ever created by humanity. MAC: Boosted Capacitance (3-shots/charge) Commanding Officer (2552): Captain Jacob Keyes
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