 The Vampire was first powered by a single Halford H1 (later produced as the de Havilland Goblin) turbojet engine, initially capable of producing 2,100 lbf (9.3 kN) of thrust, designed by Frank B Halford and manufactured by de Havilland.This engine was a centrifugal-flow type, a configuration later superseded after 1949 by the slimmer axial-flow units.In 1947, Wing Commander Maurice Smith, assistant editor of "Flight" magazine, stated upon piloting his first jet-powered aircraft, a Vampire Mk III