Distinctive Starfleet design with nacelles on pylons hugging the saucer underside and a distinctive triangular wedge, located over the rear saucer, rather than an underside secondary hull. Phasers can be emitted from the underside of the saucer. The warp engines of the class are rated at WF 9.5, but O'Brien coaxed those of the U.S.S. Prometheus up to 9.6.