By David J. Peery

Suitable for undergraduate scholars, this quantity covers equilibrium of forces, house constructions, inertia forces and cargo components, shear and bending stresses, and beams with unsymmetrical go sections. extra issues comprise spanwise air-load distribution, exterior so much at the aircraft, joints and fittings, deflections of buildings, and targeted equipment of research. subject matters regarding a data of aerodynamics seem in ultimate chapters, permitting scholars to review the prerequisite aerodynamics themes in concurrent courses.

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**Extra resources for Aircraft Structures**

**Sample text**

How much time is required? 2 If an airplane with the dimensions used in Prob. 1 is taxiing,what maximum braking force may be applied at the main wheels without the airplane nosing over? 3. An airplane weighing 5,000 lb strikes an upward gust of air which producee a wing lift of 25,000 lb. What tail load P is required to prevent a pitching dD erstion, if the dimensions are as shown? What will be the vertical acderation of the airplane? If this lift force acts until the airplane obtains a vertical velocity of 20 ft/sec, how much time is required?

In many of the loading conditions, the airplane may be considered as being in pure translation, since the rotational velocities and accelerations are small. The inertia force on any W element of m888 is equal to the product of the ma88 and the acceleraF ----+ N@=f tion and acts in a direction opposite to the acceleration. If the applied loads and inertia forcea act on an element as a free body, these forces R=W are in equilibrium. 1. shown in Fig. 1, the block will be accelerated in the direction of the force.

Where bulkheads are not free to warp, as in the case of wing bulkheads at the center line of the airplane, local corrections are applied to the analysis made by superimposingbending and torsional forces. 6. W i n g Structures. Most of the early types of airplanes were biplana, because it mas possible to design an efficient, lightweight wing structure with extend bracing. The wing loading, which is the ratio of the gross weight of the airplane to the total wing area, was quite low for the early biplanes in order to permit slow landing speeds and to permit cruiaing at a low engint+power output.