The Dewoitine D.25 was a single-engine, two-seat, parasol-wing fighter aircraft built in France in the 1920s. The 1925 French two-seat fighter programme was cancelled before any orders were placed, but four examples were exported to Argentina .
17-491: (Redirected from D-25 ) D25 may refer to: Vehicles [ edit ] Aircraft [ edit ] Dewoitine D.25 , a French fighter New Standard D-25 , an American biplane Ships [ edit ] ARA Seguí (D-25) , an Allen M. Sumner-class destroyer of the Argentine Navy Brazilian destroyer Marcilio Dias (D25) ,
34-641: A Gearing -class destroyer of the Brazilian Navy HMS ; Warwick (D25) , a W-class destroyer of the Royal Navy Spanish destroyer Jorge Juan (D25) , a Fletcher -class destroyer of the Spanish Navy Rail transport [ edit ] LNER Class D25 , a class of British steam locomotive Other uses [ edit ] D-25 (rocket engine) , a Soviet liquid rocket engine D-25 gun ,
51-485: A Soviet field gun D25 road (Croatia) DB-25 , an electrical connector Soloviev D-25 , a Soviet turboshaft helicopter engine Manitowish Waters Airport , in Vilas County, Wisconsin [REDACTED] Topics referred to by the same term This disambiguation page lists articles associated with the same title formed as a letter–number combination. If an internal link led you here, you may wish to change
68-400: Is also applied to the width of wing flaps , ailerons and rudder on an aircraft. The term is also applied to compressor and turbine aerofoils in gas turbine engines such as turbojet , turboprop , or turbofan engines for aircraft propulsion. Many wings are not rectangular, so they have different chords at different positions. Usually, the chord length is greatest where the wing joins
85-455: Is defined as wing area divided by wing span: where S is the wing area and b is the span of the wing. Thus, the SMC is the chord of a rectangular wing with the same area and span as those of the given wing. This is a purely geometric figure and is rarely used in aerodynamics . Mean aerodynamic chord (MAC) is defined as: where y is the coordinate along the wing span and c is the chord at
102-534: Is the distance between the trailing edge and the point where the chord intersects the leading edge. The point on the leading edge used to define the chord may be the surface point of minimum radius. For a turbine aerofoil the chord may be defined by the line between points where the front and rear of a 2-dimensional blade section would touch a flat surface when laid convex-side up. The wing , horizontal stabilizer , vertical stabilizer and propeller /rotor blades of an aircraft are all based on aerofoil sections, and
119-467: Is usually measured relative to the MAC, as the percentage of the distance from the leading edge of MAC to CG with respect to MAC itself. Note that the figure to the right implies that the MAC occurs at a point where leading or trailing edge sweep changes. That is just a coincidence. In general, this is not the case. Any shape other than a simple trapezoid requires evaluation of the above integral. The ratio of
136-558: The Dewoitine D.21 single-seat, parasol-wing fighter, developed to the 1925 C2 (2 seat Chasseur or fighter) programme from the Section Technique de l'Aéronautique (Technical Section of Aeronautics, STAé) for an aircraft capable of daytime and nighttime fighter duty and daytime reconnaissance. The chief structural difference between the two models, which shared the same span and length, was the D.25's second cockpit itself and
153-415: The fuselage strengthening around it to allow a gun mounting. Though the two-seater was heavier, it had a less powerful engine: it used a 450 hp (336 kW) Lorraine-Dietrich 12Eb water-cooled upright W-12 instead of the similarly arranged 500 hp (373 kW) Hispano-Suiza 12Gb . Both the D.21 and D.25 had much in common with the Dewoitine D.12 of 1924. For example, the D.25's parasol wing
170-464: The propeller . Flight testing of the D.25 began in 1926 but the STAé dropped the 1925 C2 programme. Dewoitine therefore sought to export it and in 1928 gained an order for four from Argentina . These were armed with two pairs of fixed 7.9 mm (0.311 in) Madsen machine guns , one fixed and fitted with synchronisation , firing forward through the propeller arc, and the other on a gun mounting in
187-454: The aircraft's fuselage (called the root chord ) and decreases along the wing toward the wing's tip (the tip chord ). Most jet aircraft use a tapered swept wing design. To provide a characteristic figure that can be compared among various wing shapes, the mean aerodynamic chord (abbreviated MAC ) is used, although it is complex to calculate. The mean aerodynamic chord is used for calculating pitching moments. Standard mean chord (SMC)
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#1732783487607204-408: The coordinate y . Other terms are as for SMC. The MAC is a two-dimensional representation of the whole wing. The pressure distribution over the entire wing can be reduced to a single lift force on and a moment around the aerodynamic center of the MAC. Therefore, not only the length but also the position of MAC is often important. In particular, the position of center of gravity (CG) of an aircraft
221-426: The length (or span ) of a rectangular-planform wing to its chord is known as the aspect ratio , an important indicator of the lift-induced drag the wing will create. (For wings with planforms that are not rectangular, the aspect ratio is calculated as the square of the span divided by the wing planform area.) Wings with higher aspect ratios will have less induced drag than wings with lower aspect ratios. Induced drag
238-429: The link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=D25&oldid=1132529970 " Category : Letter–number combination disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages Dewoitine D.25 The D.25 was a tandem two-seat version of
255-452: The rear cockpit. The construction of these machines was sub-contracted to the Hanriot aircraft company. Data from Green and Swanborough p.177 General characteristics Performance Armament Chord (aircraft) In aeronautics , the chord is an imaginary straight line joining the leading edge and trailing edge of an aerofoil . The chord length
272-402: The term chord or chord length is also used to describe their width. The chord of a wing, stabilizer and propeller is determined by measuring the distance between leading and trailing edges in the direction of the airflow. (If a wing has a rectangular planform , rather than tapered or swept, then the chord is simply the width of the wing measured in the direction of airflow.) The term chord
289-402: Was similar to that of the D.12, with the same span, a constant chord inner panel, outer sections tapered on both the leading and trailing edges but chiefly on the latter, ending in blunt tips . It was braced to the lower fuselage by a parallel pair of long struts on each side. The D.12 and D.25 used the same Lorraine-Dietrich engine with a circular nose-mounted radiator immediately behind
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