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Aviation History
1927
1927 - 0481.PDF
JUNE 30, 1927 Boulton and Paul " Sidestrand " Two Bristol " Jupiters " For a day bomber the " Side- strand " is a somewhat unusual machine, the twin-engine arrange- ment having certain very consider- able advantages connected with view, field of fire, etc. Generally the resistance of the wing engines is a serious item, but by careful study of the flow of the streamlines it has been possible, in the " Side- strand " to reduce interference effects to a minimum, with the result that the performance is something rather out of the ordinary. The careful planning of the lines of the fuselage should be noted. Needless to say, the machine is of all-steel construction. De Havilland " Hound " Napier " Lion " Another " General Purpose" machine, also fitted with the Napier " Lion " engine. Although an obvious De Havilland product the " Hound " represents several departures, and particularly should its clean lines be noted. So good are these that the performance of the " Hound " is quite exception- ally good. In fact, it has been jestingly remarked that the per- formance is " too good " for a machine of this type. There is nothing exceptional in the general design, no startling changes in arrangement. The high perform ance is simply due to careful avoidance of interference effects as far as possible. Fairey III F Napier " Lion " The type III F of the Fairey Aviation Co. is one of the " General Purpose" machines for which a competition was held recently. It is also the type used on the recent successful Royal Air Force flight to Cape Town and back, when this great distance was completed to schedule and without untoward incident. The III F has a strong family resemblance to the famous Fairey " Fox," and especially should it be noted how carefully the Napier " Lion " has been cowled in so as to give a clean run over the nose of the machine. In addition to the machines in use by the R.A.F., this type has been ordered by a foreign power. Vickers "Valiant " Bristol " Jupiter " This machine represents Vickers' interpretation of the General Pur- pose type specification. Aero- dynamically the machine is a clean design of fairly orthodox type, with large span, and consequently a high value of the ratio span2 : weight. This makes for low in- duced drag, and results in good climb. Structurally the " Valiant " is of all-metal construction, of forms developed by this firm during the last few years. Large balanced con- trol surfaces result in great con- trollability at low speeds. Note also the careful streamlining of the engine cylinders. 439
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