Pomilio, Ottorino · New York, McGraw-Hill · leaf 32
section for lightness (Fig. 20). The vertical struts between the upper and lower wingsof a biplane may be either of wood or steel tubing (Fig. 21). THE WINGS 17 In either case, they must have a streamHne section in orderto reduce to a minimum their head resistance. Woodstruts are often hollowed to… … ngTip Interioryfing Trussing Strut Rear Spar Fig. is. Interior Sleel tVire Cross SraCnc
Airplanes
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