Which is better, the Supermarine Spitfire or the Hawker Hurricane? That question has been asked by pilots, historians and air enthusiasts since 1940. It does not have a definitive answer, however, each aircraft had its strong points and its disadvantages. Although both aircraft played a decisive role in the Battle of Britain they could not have been more different from one another. Each was created under a completely different set of circumstances and came from totally different backgrounds and antecedents. The Spitfire owed its famous graceful lines and speed to its early ancestors, evolving as a fighter from a series of extremely successful racing seaplanes that were designed in the 1920s–and 1930s. All of those racers were built by the firm of Supermarine Ltd. and were designed by one man–Reginald J. Mitchell. The innovative Mitchell has been called one of the most brilliant designers Britain has ever produced. His designs really were ahead of their time. In 1925, when he began building racing airplanes, streamlining was considered more a theoretical exercise than an engineering possibility. But Mitchell made engineering theories more than just possibilities; he turned them into brilliant successes.

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Mitchell’s efforts at streamlining produced aircraft that were not only graceful but also among the fastest in the world. In 1927, his S.5 racer won the Schneider Trophy with a speed of 281.65 mph. Four years later, his elegant S.6B captured the Schneider Trophy outright for Britain with a speed of 340.08. Later, on September 29, 1931, his S.6B, fitted with a special ‘Sprint’ engine with its horsepower upgraded to 2,550, pushed the world speed record to 407.5 mph.

During that time, Britain’s Air Ministry began looking for a replacement for the Royal Air Force’s (RAF) standard fighters, the Bristol Bulldog and Gloster Gladiator, both of which were biplanes. Knowing he had the experience and the reputation he acquired by designing his Schneider Trophy winners going for him, Mitchell decided to make a bid for the Air Ministry’s contract to design this new fighter. The Supermarine firm had been taken over by the industrial giant Vickers by this time; the new corporation was known as Supermarine Aviation Works (Vickers) Ltd.

The first prototype of the aircraft that would become known as the Spitfire was an odd-looking affair. Officially designated the F.7/30, it was a gull-winged monoplane with an open cockpit and spatted undercarriage. It looked more like a German Junkers Ju-87 Stuka dive bomber than the Battle of Britain fighter. Mitchell was not satisfied with his F.7/30 for a number of reasons. For one thing, it was underpowered–its Rolls-Royce Goshawk II engine gave it a speed of only 238 mph. So he began to experiment. He added a larger engine, enclosed the cockpit, and gave his new fighter a retractable undercarriage with smaller, thinner wings. These thin, elliptically shaped wings would become the fighter’s most recognizable feature. Mitchell continued to modify his design in 1933 and 1934. The larger engine he had in mind was supplied by Rolls-Royce–a new, 12-cylinder, liquid-cooled power plant called simply the PV-12. Rolls-Royce would rename this engine the Merlin–a name that would become legend among aircraft power plants. The new fighter, now designated the F.10/35, developed into a low-wing interceptor with retractable undercarriage, flaps, enclosed cockpit, and oxygen for the pilot. The Merlin engine promised to give it all the speed Mitchell wanted and the Air Ministry would require. For armament, he gave his fighter four wing-mounted .303-caliber machine guns. Air Vice Marshal Hugh ‘Stuffy’ Dowding, Air Member for Supply and Research, had been in charge of the RAF’s technical development since 1930. He was favorably impressed by Mitchell’s F.10/35 except for one item-he wanted eight machine guns. Recent tests had shown that the minimum firepower needed to shoot down an enemy bomber was six or, preferably, eight guns, each capable of firing 1,000 rounds per minute. With that armament, it was estimated that a pilot would need only two seconds to destroy an enemy bomber in the air-the time during which a fighter pilot would be able to keep the enemy in his sights, it was thought.

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