The Valiant B2. One of the three prototypes was the B.2 version. The B.2 was intended to serve as a Pathfinder aircraft, flying at low level to mark targets for the main bomber force. To cope with increased air turbulence at low level, the B.2 had a strengthened airframe. In particular, the wing was strengthened with the removal of the cut-outs in the wing structure into which the main wheels retracted, allowing the wing torsion box structure to be uninterrupted and giving more room for internal fuel storage; instead the main landing gear, which had four wheels instead of the two wheels of the B.1, retracted backwards into large fairings set into the rear of the wings. The B.2 had a lengthened fuselage with a total length of , in contrast to a length of for the Valiant B.1, with the extra length giving room for more avionics.