CARRIAGE GLYPH<127> Propulsion System GLYPH<127> Flight Deck GLYPH<127> Landing Gear WING Figure 3-1. Wing and carriage of WSC aircraft. The wing has a structural frame that the sail fits over.  Although the wing structure is rigid, it is designed to move  and allow the sail to flex and the wing to deform or “warp,”  to provide a simple control system with no pulleys, push  rods, hinges, control cables, or separate control surfaces. This  simplifies maintenance and reduces the cost and weight of  the wing. Each wing is built from high quality aircraft parts  including alloyed aluminum tubes, stainless steel cables,  hardware, and specially designed sail cloth.  The structural frame of the wing is composed of the leading  edges, keel, crossbar, pilot control frame, king post and wires/ struts. The wing frame is a number of structural triangles  formed by the wing components. These triangles, braced by  wires and struts, provide a strong and lightweight frame to  support the fl exible sail.  [Figure 3-2] Leading edges are tube assemblies that are at the front of the  wing, the leading edges of the wing airfoil. These are swept  back to form the front shape of the wing and attached to each  The outboard leading edge sections can be removed to pack  up the wing into a “short pack” which is commonly used for  shipping.  [Figure 3-3] The leading edges are each made up of two main  sections, an inboard and an outboard section, as shown in  Figures 3-2  and  3-3 . Additional tubing “sleeves” are typically  used for added strength where the leading edge attaches to  the nose plates, and where the inboard and outboard tubes  join at the crossbar attachment. This sleeving can be internal  or external depending on the specifi c manufacturer’s design.  Typically, additional sleeving is used throughout the leading  edges at various locations to strengthen and vary the fl ex for  the particular design of the wing. Each manufacturer and  make/model uses different internal and external sleeving  to accomplish specific strength and fl ex characteristics.  Generally, the inboard sections are stiffer and the outboard  leading edge section flexes as part of the fl exible wing  design. Sleeving is commonly added throughout the aircraft  where bolt holes are drilled through the tubing to reinforce  it around the bolt hole.  other with nose plates. The leading edges support the airfoil  and are designed to flex as part of the wing structure.   Wing   Wing Frame Components   Leading Edges 3-2