Gloster Gorcock  J7503                       (c/n


                                    Three of these experimental fighters were built (J7501-7503)      The first two Gorcocks were
                                    of  mixed construction with steel fuselage longerans and wooden wing spars and ribs. The third
                                    machine, seen above, was basically all metal.  All, of course, had fabric covering.    The three
                                    machines were fitted with various Napier Lion engines, and, despite their being used purely for
                                    research, carried twin synchronized 7.7 mm Vickers machine guns.  Design of J7503, with a
                                    geared Lion IV engine, commenced in mid-1925 although it was not completed until June 1927.