 The new design , given the company designation B @-@ 48 , was known unofficially by Blackburn as the " Firecrest " but was always known by its specification number by the Air Ministry and Navy . It was a low @-@ winged , single @-@ seat , all @-@ metal <unk> . <unk> of the cockpit the fuselage was an oval @-@ shaped stressed @-@ skin semi @-@ <unk> , but forward it had a circular @-@ section , tubular @-@ steel frame . The cockpit of the Firecrest was moved forward and raised the pilot 's position so that he now looked over the wing leading edge , and down the nose . The canopy was adapted from the Hawker Tempest fighter . In the rear fuselage was a single 52 @-@ imperial @-@ gallon ( 240 l ; 62 US gal ) fuel tank with two 92 @-@ imperial @-@ gallon ( 420 l ; 110 US gal ) fuel tanks in the centre wing section . The aircraft had a redesigned , thinner , inverted gull wing of <unk> flow <unk> section . The wing consisted of a two @-@ spar centre section with just over 6 @.@ 5 degrees of <unk> and outer panels with 9 degrees of dihedral . It could be <unk> folded in two places to allow more compact storage in the hangar decks of aircraft carriers . Four Fowler flaps were fitted to give good low @-@ speed handling for landing and the wing had retractable dive brakes on both surfaces . In the course of the redesign the structure was simplified which reduced weight by 1 @,@ 400 lb ( 635 kg ) and even after the fuel capacity was increased by 70 imperial gallons ( 320 l ; 84 US gal ) the gross weight was still 900 pounds ( 410 kg ) less than that of the Firebrand . 
