FSX Northrop P-61B Black Widow WW2 night fighter. The Northrop P-61 is a twin-engine two to three place night fighter. It was designed as a cantilever monoplane with a central fuselage pod, engine nacelles blended into the double booms carrying the double-fin empennage. It had a retractable tri-cycle undercarriage and was equipped with the radar gear and gun and rocket armament. Update by by Wayne Farrell.