planned, but to reduce cost only the smallest () and largest () were flown. Since the diameter of the Jupiter was about , the cylinder heads were well exposed with the smaller fairing and enclosed by the larger. Operational history Powered by a Jupiter V engine, the Type 92 first flew from Filton on 13 November 1925. It was ungainly in the air, was never registered nor flown far from Filton, but it was in use for more than two years, mostly with the fairing. The larger fairing was fitted in 1928, but not long after, the undercarriage was damaged in a heavy landing and the Type 92 did not fly again. By the end of the 1920s, the problem of cowling radial engines was beginning to be mastered, though it is not clear how much the Type 92 contributed to the solution. In 1929, the Townend ring appeared, improving the airflow but open enough not to impede cooling; in 1928-9, NACA was releasing and applying the results of very successful tests on closely cowled engines in the diameter Propeller Research Tunnel (PRT). The PRT's ability to test full scale cowlings meant that they could be developed under ground-based laboratory conditions, rather than flying them on a laboratory aircraft, and the difficult problems of trying to scale low Reynolds number model data to realistic values were avoided. Specifications References Notes Bibliography 1920s British experimental aircraft Type 092 Aircraft first flown in 1925 Biplanes