Fuselage

Fuselage of a Boeing 737 shown in brown

The fuselage (pronounced /ˈfjuːzəlɑːʒ/; from the French fuselé "spindle-shaped") is an aircraft's main body section that holds crew and passengers or cargo. In single-engine aircraft it will usually contain an engine, although in some amphibious aircraft the single engine is mounted on a pylon attached to the fuselage which in turn is used as a floating hull. The fuselage also serves to position control and stabilization surfaces in specific relationships to lifting surfaces, required for aircraft stability and maneuverability.

Contents

Types of structures

Tipo se fuselajes.JPG


Piper PA-18 welded tube truss fuselage structure

Truss structure

This type of structure is still in use in many lightweight aircraft using welded steel tube trusses. A box truss fuselage structure can also be built out of wood—often covered with plywood—as can be seen on this Ibis canard fuselage.

Geodesic construction

Geodesic airframe fuselage structure is exposed by battle damage

Geodesic structural elements were used by Barnes Wallis for British Vickers between the wars and into World War II to form the whole of the fuselage, including its aerodynamic shape. In this type of construction multiple flat strip stringers are wound about the formers in opposite spiral directions, forming a basket-like appearance. This proved to be light, strong, and rigid and had the advantage of being made almost entirely of wood. A similar construction using aluminum alloy was used in the Vickers Warwick with less materials than would be required for other structural types. The geodesic structure is also redundant and so can survive localized damage without catastrophic failure. A fabric covering over the structure completed the aerodynamic shell (see the Vickers Wellington for an example of a large warplane which uses this process). The logical evolution of this is the creation of fuselages using molded plywood, in which multiple sheets are laid with the grain in differing directions to give the monocoque type below.

Monocoque shell

The Van's Aircraft RV-7 fuselage is slender for high speed flight

In this method, the exterior surface of the fuselage is also the primary structure. A typical early form of this (see the Lockheed Vega) was built using molded plywood, where the layers of plywood are formed over a "plug" or within a mold. A later form of this structure uses fiberglass cloth impregnated with polyester or epoxy resin, instead of plywood, as the skin. A simple form of this used in some amateur-built aircraft uses rigid expanded foam plastic as the core, with a fiberglass covering, eliminating the necessity of fabricating molds, but requiring more effort in finishing (see the Rutan VariEze). An example of a larger molded plywood aircraft is the de Havilland Mosquito fighter/light bomber of World War II. No plywood-skin fuselage is truly monocoque, since stiffening elements are incorporated into the structure to carry concentrated loads that would otherwise buckle the thin skin. The use of molded fiberglass using negative ("female") molds (which give a nearly finished product) is prevalent in the series production of many modern sailplanes. The use of molded composites for fuselage structures is being extended to large passenger aircraft such as the Boeing 787 Dreamliner (using pressure-molding on female molds).

Semi-monocoque

Sectioned fuselage showing frames, stringers and skin all made out of aluminium

This is the preferred method of constructing an all-aluminum fuselage. First, a series of frames in the shape of the fuselage cross sections are held in position on a rigid fixture, or jig. These frames are then joined with lightweight longitudinal elements called stringers. These are in turn covered with a skin of sheet aluminum, attached by riveting or by bonding with special adhesives. The fixture is then disassembled and removed from the completed fuselage shell, which is then fitted out with wiring, controls, and interior equipment such as seats and luggage bins. Most modern large aircraft are built using this technique, but use several large sections constructed in this fashion which are then joined with fasteners to form the complete fuselage. As the accuracy of the final product is determined largely by the costly fixture, this form is suitable for series production, where a large number of identical aircraft are to be produced. Early examples of this type include the Douglas Aircraft DC-2 and DC-3 civil aircraft and the Boeing B-17 Flying Fortress. Most metal light aircraft are constructed using this process.

Both monocoque and semi-monocoque are referred to as "stressed skin" structures as all or a portion of the external load (i.e. from wings and empennage, and from discrete masses such as the engine) is taken by the surface covering. In addition, all the load from internal pressurization is carried (as skin tension) by the external skin.

Materials

Early aircraft were constructed of wood frames covered in fabric. As monoplanes became popular, metal frames improved the strength, which eventually led to all-metal aircraft with metal covering all surfaces. Some modern aircraft are constructed with composite materials for major control surfaces, wings, or the entire fuselage such as the Boeing 787. On the 787, it makes possible higher pressurization levels and larger windows for passenger comfort as well as lower weight to reduce operating costs.

Wing integration

"Flying wing" aircraft, such as the Northrop YB-49 Flying Wing and the Northrop B-2 Spirit bomber have no separate fuselage; instead what would be the fuselage is a thickened portion of the wing structure.

Conversely there have been a small number of aircraft designs which have no separate wing, but use the fuselage to generate lift. Examples include NASA's experimental lifting body designs and the Vought XF5U-1 Flying Flapjack. In semi-monocoque type most of the loads are carried by longerons and stringers a part of load is carried by skin.

A blended wing body can be considered a mixture of the above. It carries the useful load in a fuselage producing lift. A modern example is Boeing X-48. One of the earliest aircraft using this design approach is Burnelli CBY-3, which fuselage was airfoil shaped to produce lift.

Gallery

See also

External links


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Look at other dictionaries:

  • fuselage — [ fyz(ə)laʒ ] n. m. • 1908; de fuselé, ou de l expr. fuseau moteur ♦ Corps (d un avion, d un planeur) auquel sont fixées les ailes. ● fuselage nom masculin Corps fuselé d un avion ou d un planeur, reliant les ailes à l empennage et constituant… …   Encyclopédie Universelle

  • fuselage — fu se*lage n. [F. fusel spindle shaped + age; fr. L. fusus spindle.] (A[ e]ronautics) The central, approximately cylindrical portion of an airplane which carries the passengers, crew, and cargo. It usually forms the main structural portion of an… …   The Collaborative International Dictionary of English

  • fuselage — (n.) 1909, from Fr. fuselage, from fuselé spindle shaped, from O.Fr. *fus spindle, from L. fusus spindle. So called from its shape …   Etymology dictionary

  • fuselage — ► NOUN ▪ the main body of an aircraft. ORIGIN French, from fuseler shape into a spindle …   English terms dictionary

  • fuselage — [fyo͞o′sə läzh΄; fyo͞o′zəläzh΄; fyo͞o′səläj΄, fyo͞o′zə läj΄, fyo͞o′zəlij΄, fyo͞o′zə lij΄] n. [Fr < fuselé, tapering (< OFr fus, spindle < L fusus) + age, AGE] the body of an airplane, exclusive of the wings, tail assembly, and engines …   English World dictionary

  • Fuselage — Article principal : Configuration générale d un aéronef. Fuselage avant (et poste de pilotage) d un bombardier B 29 Le fuselage désigne l enveloppe d un avion qui reçoit généralement la charge transportée, ainsi que l équipage. Le fuselage d …   Wikipédia en Français

  • fuselage — /fyooh seuh lahzh , lij, zeuh , fyooh seuh lahzh , zeuh /, n. Aeron. the complete central structure to which the wing, tail surfaces, and engines are attached on an airplane. [1905 10; < F, equiv. to fusel(é) spindle shaped (deriv. of fuseau… …   Universalium

  • fuselage — UK [ˈfjuːzəlɑːʒ] / US [ˈfjuzəˌlɑʒ] noun [countable] Word forms fuselage : singular fuselage plural fuselages the main part of an aircraft that the wings are fixed to …   English dictionary

  • fuselage — Nacelle Na*celle (n[.a]*s[e^]l ), n. [F.] 1. A small boat. [Obs.] [Webster 1913 Suppl.] 2. The basket suspended from a balloon; hence, the framework forming the body of a dirigible balloon, and containing the machinery, passengers, etc. [Webster… …   The Collaborative International Dictionary of English

  • fuselage — [[t]fju͟ːzɪlɑːʒ[/t]] fuselages N COUNT The fuselage is the main body of an aeroplane, missile, or rocket. It is usually cylindrical in shape …   English dictionary


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