WHAT IS AN FUSELAGE ?

The fuselage, or body of the airplane, is a long hollow tube which holds all the pieces of an airplane together.

What are the types of fuselage?

Mainly there are three types

1. Monocoque

2.Semi Monocoque

3. Truss type

Monocoque :-

Which commonly means single shell. It is mainly constructed of Bullheads, formers and Aircraft Skin. In this case Aircraft skin is the primary load carrying member. Bulkheads and formers are secondary load carrying members. Although it practically can carry more load, the drawback of this type is that it may require maintenance more compared to the other designs, as the structure needs to be reinforced in order to maintain the structural integrity. Note: It has low strength to weight ratio. Used in old age aircraft.

The semi monocoque :-

It is a strengthened structure and has high strength to weight ratio. It is mainly constructed of bulkheads, frames, longer ons, stringes and aircraft skin. Here the primary load carrying members are longerons and secondary load carrying members are bulkheads, frames and skin whereas tertiary load carrying member is stringes. This concept is widely used both in military and also in the commercial industry. In military, this concept is believed to enable planes to gain more speed.

The truss type construction :-

It is used in olden days light weight Aircraft. Truss type construction is mainly of Longerons, vertical members and diagonal members where the longerons are the primary load carrying members. The truss-framed fuselage is generally covered with fabric. The truss-type fuselage frame is usually constructed of steel tubing welded together in such a manner that all members of the truss can carry both tension and compression loads.

SOME DEFINITION

  1.  STRINGERS  In aircraft construction, a stringer is a thin strip of material to which the skin of the aircraft is fastened. In the fuselage, stringers are attached to formers (also called frames) and run in the longitudinal direction of the aircraft.
  1.  STRINGERS  In aircraft construction, a stringer is a thin strip of material to which the skin of the aircraft is fastened. In the fuselage, stringers are attached to formers (also called frames) and run in the longitudinal direction of the aircraft.
  2. LONGERONS A longeron and stringer is the load-bearing component of a framework. The term is commonly used in connection with aircraft fuselages and automobile chassis. Longerons are used in conjunction with stringers to form structural frameworks
  3. FRAME Frame is related both to the fuselage structure and to the lifting surfaces located at both sides of the fuselage. The term “lifting surface” includes wings of the aircraft, and associated stabilizing and/or supporting surfaces, such as horizontal stabilisers or pylons for supporting the engines of the aircraft.

The principal structural parts of the wing are

1.spars, In a fixed-wing aircraft, the spar is often the main structural member of the wing, running spanwise at right angles to the fuselage

2.ribs,the ribs attach to the main spar, and by being repeated at frequent intervals, form a skeletal shape for the wing.

3.stringers.

These are reinforced by trusses, I-beams, tubing, or other devices, including the skin. The wing ribs determine the shape and thickness of the wing (airfoil).

Author: TECH SINGH Urs

TECH LEARNING WITH NEW VISION

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