| The
            Derwent was actually two different engines.  The first
            was a redesigned B.23 Welland with increased airflow and
            straight through combustion chambers.  Marks I through IV were
            of this design reaching 2,450 lb thrust.  Production began in
            1944. It was suggested a scaled down Nene engine would
            fit the nacelle of a Gloster Meteor.  A quick calculation
            estimated thrust at 3,650 lb.  By the end of 1945, a Meteor
            powered by the Derwent V set a world speed record of 606 mph. |  | 
              |  | Turbojet |  |  | Compressor: Dual-sided centrifugal |  |  | Turbine: single-stage axial |  |