The Gloster Meteor was a British single-seat twin-jet fighter monoplane of the Second World War. It was the only Allied jet-propelled aeroplane to go into operational service during the war, and was armed with four 20 mm British Hispano cannons mounted alongside the pilot and firing forward. A camera gun was also included in the fuselage nose which was linked to the cannon firing mechanism, or could be used independently. The Gloster Meteor F1 was powered by two Rolls-RoyceWellandcentrifugal turbojets providing a top speed of 410 mph, the F4 model was powered by two Rolls-RoyceDerwent 5 engines providing a top speed of 550 mph. Research Gloster Meteor