E-25 Single sleeve valve single cylinder research engine |
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| This engine carried a load of 520 lb per sq. in. B. M. E. P. when engaged in supercharging tests in the 1930s. From this kind of work was evolved the successful sleeve valve aircraft engines which alone among the belligerents the British used. The Perseus, Hercules, Taurus, Centaurus from Bristols, the Rolls-Royce Eagle, and the Napier Sabre produced 200, 000, 000 H. P. during the war years. In fact, the Rolls-Royce Merlin and Griffon were the only common British poppet valve aircraft engines by 1945. |