from starfleet museum to Enterprise....i re-introduce you to the NCC-05 USS Atlantis, NX Atlantis Class - Final NX Design. this design became the future for all federation vessels with it being the first ship with a secondary engineering hull storing the warp core and shuttlebay.
the original engineering rooms were changed to science labs and cargo holds allowing for more advanced studies and storage on long term voyages.
As the first of her class was under construction the United federation of Planets charter was signed, with it the Atlantis was painted with UFP markings. 
th Atlantis was the first ship capable of reaching the top speed of Warp 7