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Aviation History
1923
1923 - 0019.PDF
JANUARY I I , 1923 E S B 0 S S S The Hanriot all- metal biplane : This view, taken from above, gives a good idea of the single-spar wing construction. Both in the fuse- lage and wings, channel section Duralumin is used extensively. H H H H H H H a a H a a a a a a a a a a a a a 0 a a a a a form of sheet steel fittings, some of which are of somewhat complicated shape, but all of which appear extremely well- made, and, like the rest of the machine, beautifully finished. The lower main spar is attached, also by a sheet steel fitting, to lower longeron and the junction of two of the under- carriage struts with the fuselage. The upper plane, which is of much larger span and chord than the lower, is of similar construction, with the exception that the main spar, placed fairly far aft in the Schoukowsky aerofoil, is not a one-piece Duralumin tube, but is built-up of sides stamped out to form an N-girder, riveted to flat top and bottom flanges. In stamping-out the lightening pieces of the spar sides, these are given a slight curvature, so that the " legs " of each " N " are in section like a very shallow trough. Each side of a spar appears to be in one* piece, stamped out of a single strip of Duralumin. The ribs of both top and bottom plane are built up in the form of a Warren girder, the material used being light Duralumin of channel-section. Ailerons are fitted to top plane only, and are operated by a system of tubes, chains SOMF HANRIOT DETAILS : Fig. 1 shows a small portion of the lower plane, which is built up of channel-section ribband stringers over rectangullr section Duralumin tube spars. In the inset is shown the system of tribula- tion which takes the place of internal drag and torsion bracing. Fig. 2 shows the fuselage construction which is of channel-section Duralumin for longerons and triangulating struts. A number of light stringers are added to the main structure, as shown in the inset. i9 1^~-;::-
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