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Aviation History
1929
1929 - 0105.PDF
JANUARY 17, 1929 THE BLACKBURN METAL " BLUEBIRD Views of tail and nose. I " FLIGHT " Photographs The engine is a de Havilland " Gipsy." webs are merely small pieces of Duralumin sheet, placed at intervals, and having flanged lightening holes stamped in them. Needless to say, the wings are designed to be folded, and an improved type of hinge arrangement has been adopted which avoids the necessity for using jury struts. Ailerons of the Bristol-Frise type are fitted to the lower plane only, and purchasers who so desire can have Handley Page automatic wing tip slots fitted to the top plane. Tail.—The tail surfaces have spars, leading and trailing edges of steel tube, with light ribs of Duralumin. The tail plane is so mounted that it can be trimmed for incidence during flight, this being accomplished by a smaller lever in a notched quadrant in the cockpit, via a lay shaft, cranks and cables. There is no fixed fin, but the rudder is of large area and provided with a horn balance. Undercarriage.—The undercarriage is of simple " split V-type, of fairly wide track. No wire or cable bracing is used in it, the structure being stabilised by the diagonal arrangement of the steel tubes which compose the under- [" FLIGHT " Sketches THE BLACKBURN " BLUEBIRD IV ": Details of the tubular engine mounting. The actual engine bearersare of channel section, and tilted to simplify attachment to the tubes. The " feet " on the engine are sloped to correspond. 43 D 2
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