The wings were completely redesigned with a new structure and using thicker-gauge light alloy skinning. Stronger undercarriage legs were raked 2 inches (5.08 cm) forward, making the Spitfire more stable on the ground and reducing the likelihood of the aircraft tipping onto its nose.The Hispano Mk IIs were now belt fed from box magazines allowing for 120 rpg (the "Chattellerault" system). Otherwise this version of the FR Mk XIVE was essentially the same as the standard aircraft. When the Mk XII was able to engage in combat it was a formidable fighter and several Fw 190s and The first Griffon-powered Spitfires suffered from poor high altitude performance due to having only a single stage supercharged engine. In addition, 30, 45, 50 or 90 gal drop tanks could be carried. The modified, hand-built wing was first fitted to a Mk VIII The final Spitfire variant, the Mk 24, was similar to the Mk 22 except that it had an increased fuel capacity over its predecessors, with two fuel tanks of 33 gal (150 l) each installed in the rear fuselage. In comparative tests with a Mk IX it was 14 mph (23 km/h) faster at sea level, but above 20,000 ft (6,100 m) it had become slower. In fighter configuration the F Mk 24's armament consisted of 4 × short-barrelled 20 mm Hispano cannon – operational experience had proved that the hitting power of these larger weapons was necessary to overcome the thicker armoured plating encountered on enemy aircraft as the war progressed.
Although initially based on the Mk VIII airframe, common improvements made in aircraft produced later included the cut-back fuselage and The Mk XIV differed from the Mk XII in that the longer, two-stage supercharged Griffon 65, producing 2,050 hp (1,528 kW), was mounted 10 inches (25.4 cm) further forward: the top section of the engine bulkhead was angled forward, creating a distinctive change of angle to the upper cowling's rear edge. By late 1944, Spitfire XIVs were fitted with an extra 33 gal in a rear fuselage fuel tank, extending the fighter's range to about 850 miles (1,370 km) on internal fuel and a 90 gal drop tank.The first test of the aircraft was in intercepting V1 flying bombs, and the Mk XIV was the most successful of all Spitfire marks in this role. They were used by only one RAF squadron, Introduced into service in 1946, the F Mk 24 differed greatly from the original Spitfire Mk I in many respects and was twice as heavy, more than twice as powerful and showed an increase in climb rate of 80% over that of the prototype, 'K5054'. By 1943, Rolls-Royce engineers had developed a new Griffon engine, the 61 series, with a two-stage supercharger. When retracted the wheels were now fully enclosed by triangular doors which were hinged to the outer edge of the wheelwells.In other respects, the first production Mk 21s used the same basic airframe as the Mk XIV. To ensure sufficient ground clearance for the new propeller, the undercarriage legs were lengthened by 4.5". Unless otherwise noted all Griffon-engined Spitfire variants used the strengthened DunlopAH10019 "four spoke" pattern mainwheels.
1943-1948 was a transition period during which new aircraft entering service were given On 4 December 1939, the Supermarine design staff produced a brochure which mooted the idea of converting the Spitfire to use the The Griffon IIB which powered the Mk IV was a single-stage supercharged engine of 1,735 hp (1,293 kW). Stronger main longerons were needed to cope with the weight of the Griffon and it required a bigger radiator and oil cooler, although it kept the asymmetric under-wing radiator layout of the single stage Merlin marks. The majority of Spitfires, from the Mk VIII on, used three basic wing types — the C through to the E types.
All had the larger "Although designed primarily as a fighter-interceptor aircraft, the Spitfire proved its versatility in several different roles. The fighter's maximum range was just a little over 460 miles (740 km) on internal fuel since the new Griffon engine consumed much more fuel per hour than the original Merlin engine of earlier variants;. Don Healy of In spite of the difficulties pilots appreciated the performance increases. A total of 81 Mk 24s were completed, 27 of which were conversions from Mk 22s. To achieve this a new hatch, similar to the radio hatch on the port side, was installed on the starboard side, and both hatches were fitted with camera ports in streamlined blisters. As the Spitfire gained more power and was able to fly at greater speeds the possibility was that pilots would encounter The standard armament was now four 20mm Hispano IIs or the shorter, lighter Hispano V cannons each with 150 rounds per gun. The new wing was torsionally 47% stiffer, allowing an increased theoretical aileron reversal speed of 825 mph (1,328 km/h). The oil tank (which had been moved from the lower cowling location of the Merlin engine variants to forward of the fuselage fuel tanks) was increased in capacity from 6 to 10 gal. It was identical in most respects including engine (the Griffon 65) and cockpit enhancements, but it carried extra fuel and had a revised, stronger wing structure.
The ailerons were 5% larger, and were no longer of the The Griffon engine drove an 11 ft (3.35 m) diameter five-bladed propeller, some 7 inches (17.8 cm) larger than that fitted to the Mk XIV. Although the Griffon-engined Spitfires were never produced in the large numbers of the Merlin-engined variants they were an important part of the Spitfire family and, in their later versions, kept the Spitfire at the forefront of piston-engined fighter development. To help balance the new engine the radio equipment was moved further back in the rear fuselage and the access hatch was moved from the left fuselage side to the right.
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