This is the federation starship Prometheus NX-59650, Prometheus class (thanks victimraid). I saw this ship in Voyager's "Message in a Bottle" episode, and remember thinking how cool it looked. I like the arrowhead design of the saucer section and the four warp nacelles. My model doesn't have a multi-vector assault mode. But I'd like to try it someday.
Always nice to see a lovingly-made Trek MOC on this site - it's a nice break from all the Star Wars MOCs running around. Anyways, yours looks very fun and "swoosh-able," and I look forward to a verson that can do the multi-vectored assault mode.