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Aviation History
1913
1913 - 1215.PDF
NOVEMBER 15, 1913. (/JJGHT] THE DUNNE BIPLANE. THE DUNNE BIPLANE.—View from the rear. AT the present time there may be said to be two general types of aeroplanes which have been designed with a view to obtaining inherent automatic stability. One type has been developed in Austria and Germany by Herr Etrich and in this country by Mr. Handley Page, and the other is the Dunne type here described. As the theory of the Dunne machines has already been fully explained in the columns of FLIGHT (June 18th and 25th, 1910), we need not here enlarge upon that subject, but can confine ourselves to a description of the practical construction of the machine. We should like, however, to point out the most essential difference between the Etrich-Handley Page type and the Dunne. In the former stability is obtained by having the trailing edge of the back swept wing tips raised, thus setting these at a negative angle of incidence, whilst in the Dunne the leading edge of the wings are given a negative dihedral angle in order to obtain a negative angle of incidence on the wing tips. Another point in which the Dunne differs very consider ably from the other types is that whilst these have tail planes of the ordinary type the Dunne machines have no tail planes, or, more correctly speaking, the back swept main planes perform the duty of the usual tail planes, in so far as they serve as both rudder and elevator. From the plan view of the machine it will be seen that the main planes slope backwards very considerably, 14 ft. to be exact. Whilst the chord remains the same through out the whole length of the planes, the rear spars slope • m III I ''."* The Gnome engine in place on the Dunne biplane. THE DUNNE BIPLANE. -Three'Cjuarter view from the front. 1241
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