 Complete the following phrase:  The F.8 also featured a fuselage stretch of , intended to shift the aircrafts centre of gravity and also eliminate the use of ballast formerly necessary in earlier marks due to the subsequent elimination from the design of two of the originally designed six installed cannon. The F.8 incorporated uprated engines, Derwent 8s, with thrust each combined with structural strengthening, a Martin Baker ejection seat and a blown teardrop cockpit canopy that provided improved pilot visibility. Between 1950 and 1955, the Meteor F.8 was the mainstay of RAF Fighter Command, and served with distinction in 