Download Airplane Power Plants Systems Designing (synopsis) by V. Shmyrov, et al., PDF

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Node A Fig. 16. Engine Mounts of Bypass Turbojet to Fuselage Thrust force and side loadings are carried in nodes A and A’. These nodes are formed by rods 1, 3, 4, 5 arranged almost in horizontal planes. The most part of vertical load is carried by group of rods 1, 2, 3 lying in one vertical plane. Rods 6 and 7 take part in transmission of M y moment and side loading. At rigging statically indeterminable structures, first of all they detach redundant members. Rigging is carried out. Then redundant members are 44 attached again.

The nacelle usually consists of a body and cowlings. Airframe of cowlings can be frame and panel. In the frame schemes, strength and stiffness are formed by a framework. Removable covers with thin skin, reinforced by load–carrying structure, are mounted to this framework. The panel cowling consists of stiff panels connected among themselves by locks and forming the closed load–carrying shell. Loads from a cowling are transmitted to an engine, and through engine mounts to an aircraft. Simultaneous attachment of the cowling to the engine and to the aircraft is prohibited.

The engines are in personal nacelles (Fig. 35, c). [+] Fire danger is minimal. [+] Length of air intakes is minimal. [+] Engines unload the wing in flight. Hence the wing has smaller weight. [–] Turning moment, when one engine is failed, is the biggest. [–] Positive effect from compression is minimal. 29 Theme 3. NACELLES AND COWLINGS OF ENGINES. 1. 1. Purpose and Components of Nacelles and Cowlings The nacelle is intended to reduce aerodynamic drag and to organize airflow ensuring cooling of engine.

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