Odysseus-class Federation starships were an experimental class of Starfleet vessels in service in the late 23rd and early 24th centuries, from approximately 2280-2311.
Specifications
The most distinct feature of the Odysseus-class starships were their curved warp nacelles, which gave the ship a rather boxy appearance, especially when compared to the sleeker Excelsior-class vessels. It was theorized at the time of construction that the curved engine nacelles would allow for more efficient warp-field generation. Though the Odysseus-class ships were functional, the curved nacelles never provided any significant advantage. Only eight Odysseus-class vessels were constructed, and by 2311 only two were still in service, one of them the USS Agamemnon. (ST - The Lost Era novel: Serpents Among the Ruins)