TAILIEUCHUNG - Aircraft Design Projects Episode 11

Tham khảo tài liệu 'aircraft design projects episode 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | High-altitude long-endurance HALE uninhabited aerial surveillance vehicle UASV 281 Fig. Flying-wing layout option production aircraft with the exception of the B-2 stealth bomber . Many enthusiasts for the type have claimed the layout to be aerodynamic and structurally efficient but it seems that such expectations have not yet been realised the B-2 layout is selected for stealth reasons . The reason may be due to the linking of stable torsional deflections to the aerodynamic forces and the consequential requirement to modify the wing planform and sectional geometry to avoid this problem. The layout is regarded as efficient at one design point but seriously compromised away from this condition. The flying wing configuration was considered in the German study1 but dismissed on these technical issues. Braced wing layout Figure The structural bracing of the wing to the fuselage was a common feature in historic aircraft layouts. This was done to reduce the loads in the wing to match the relatively poor structural properties of the materials used in the construction. The development of stronger and more consistent materials allowed such bracing and the associated drag penalty to be eliminated. The traditional monoplane wing layout has been the preferred choice over the past several decades. As wing aspect ratio is increased the benefit of bracing becomes more attractive as it significantly reduces wing bending moments. In recent years some NACA funded research6 has shown that wing bracing could provide advantages to the design of long-range civil jet transport aircraft. The purely tensile loaded brace reduces the shear bending and torsion on the wing structure. This correspondingly allows either a thinner wing or a larger aspect ratio to be used on the wing geometry. A thinner wing would allow the wing to be less swept for a design critical Mach number. All of these effects reduce aircraft drag and consequently fuel burn. Positioning the brace attachment to

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