Chimera class (fast frigate)

The Chimera-class was a type of starship in service with Starfleet during the latter half of the 24th century. (Star Trek Encyclopedia)

The Chimera was designed as a fast frigate and launched in 2366. It is derived from the sharing the same saucer and nacelle design. The Chimera has three nacelles, one located above and two below. 

Background information

 * Specifications from the.