The RAF's Gloster Meteor had been 1st and just functional Allied jet fighter to actually enter combat in WWII. In March 1943, a jet model created by the Gloster business and loaded with a De Havilland H.1 motor made its very first effective test flight. In July of 1944, pilots traveling the initial production form of the Meteor, the F.1 fighter, fought fearlessly into the Battle of Britain under the No. 616 Squadron. The F.1 housed two Rolls-Royce Welland jet engines capable of taking the fighter to rates of 668km/h and was fairly effective in protecting the Uk homeland against German V-1 rockets. The F.1 ended up being later replaced by the enhanced F.3 variation with its Rolls Royce Derwent engines, changed canopy design, and increased gas capability.