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Salmson 2
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The Salmson 2 A.2, (often shortened to Salmson 2) was a French biplane reconnaissance aircraft developed and produced by Salmson to a 1916 requirement. Along with the Breguet 14, it was the main reconnaissance aircraft of the French army in 1918 and was also used by American Expeditionary Force aviation units. At the end of the First World War, one-third of French reconnaissance aircraft were Salmson 2s.
Key Information
Design and development
[edit]During the First World War, the Salmson factory built aircraft engines, generally 9- and later 18-cylinder water-cooled radial engines developed from the Swiss Canton-Unné design, an early stationary radial engine design used for military aircraft. The company's first aircraft was the Salmson-Moineau S.M.1, an unusual three-seat reconnaissance biplane with twin propellers gear-driven from a single Salmson engine mounted sideways in the fuselage but it was not successful although it saw limited production.
The Salmson 2 came from a requirement to replace the Sopwith 1½ Strutter and Dorand A.R. reconnaissance aircraft in the A.2 (tactical reconnaissance) role. Salmson had built the 1½ Strutter under license, and the Salmson 2, while an original design, had more in common with the Sopwith than to the Salmson-Moineau. The aircraft was of conventional construction with a two-bay biplane configuration, powered by the company's own 230 hp (170 kW) Salmson 9Z water-cooled radial engine. Some minor control problems were quickly resolved in early testing, but the main defect of the Salmson 2, shared with the contemporary Airco DH.4, was that the pilot and gunner were widely separated, making communication difficult. Production was ordered after trials on 29 April 1917, and deliveries were underway by October of that year. Around 3,200 Salmson 2s were built in France, 2,200 by Salmson and the remainder by the Latécoère, Hanriot, and Desfontaines, companies. Some of these were Salmson 2 E.2 dual control advanced training (Ecole) aircraft.
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Variants
[edit]Developments of the Salmson 2 included:
- Salmson 2 A.2 standard model.
- Salmson 2 E.2 dual control advanced training aircraft.
- Salmson 4 Ab.2 was an enlarged version fitted with armour to meet the ground attack role. Production in 1918 was limited, and was cancelled at the end of the war.
- Salmson 5 A.2 was a modified Salmson 2, with no production.
- Salmson 7 A.2 was a modified Salmson 2. The primary change was that the pilot and gunner were seated back-to-back in a single cockpit. Large scale production was planned, but was cancelled with the end of the war.
- Salmson Limousine ex-military Salmson 2s converted into enclosed civilian passenger aircraft after the First World War.
- Salmson 2 Berline ex-military Salmson 2s converted into open cockpit civilian passenger aircraft after the First World War.
- Kawasaki Army Otsu-1 (乙-1) Reconnaissance Aircraft was a Japanese licence-built Salmson 2 A.2.
Operational history
[edit]In addition to its service with the French army, the Salmson 2 served during the First World War with United States air units. Some 700 were purchased, and were generally successful.
Postwar Salmson 2s were purchased by Czechoslovakia, and remained in service until 1924. Others were transferred to Poland, but were withdrawn by 1920, and replaced by Bristol F.2Bs. Japan undertook licensed production as the Army Type Otsu 1, also known as the Kawasaki-Salmson. The number of aircraft built in Japan is unclear; 300 were built by Kawasaki, and the same quantity by the Imperial Japanese Army's Tokorozawa supply depot, although the total number of aircraft produced may have been as high as 1,000.
After First World War, the Salmson 2 A.2 produced by Latécoère were the first aircraft used by French pioneering airmail company Aéropostale.
Military operators
[edit]Wartime
[edit]
Post-war
[edit]
- Belgian Air Force - One aircraft only.
- Peruvian Air Force - One aircraft only.
- Spanish Air Force - One aircraft only.
Aircraft on display
[edit]- Kakamigahara Aerospace Museum, Kakamigahara, Gifu (replica)
- L'Envol des Pionniers, Toulouse, France (replica)
- Replicas
-
Replica Salmson 2 A.2/Otsu 1 in Japan. -
Replica Salmson 2 A.2 in Toulouse, France.
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Specifications
[edit]
Data from French Aircraft of the First World War[2]
General characteristics
- Crew: 2
- Length: 8.5 m (27 ft 11 in)
- Wingspan: 11.75 m (38 ft 7 in)
- Height: 2.9 m (9 ft 6 in)
- Wing area: 37.27 m2 (401.2 sq ft)
- Empty weight: 780 kg (1,720 lb)
- Gross weight: 1,290 kg (2,844 lb)
- Powerplant: 1 × Salmson 9Za 9-cylinder water-cooled radial piston engine, 172 kW (231 hp)
- Propellers: 2-bladed fixed-pitch propeller
Performance
- Maximum speed: 188 km/h (117 mph, 102 kn) at sea level
- Range: 500 km (310 mi, 270 nmi)
- Service ceiling: 6,250 m (20,510 ft)
- Time to altitude: 2,000 m (6,562 ft) in 7 minutes 13 seconds[3]
Armament
- Guns: *
- 1 × forward synchronized 0.303 in Vickers machine gun
- 2 × rear, ring-mounted 0.303 in Lewis guns
References
[edit]- ^ Morareau 1990, p. 15.
- ^ Davilla, James J.; Soltan, Arthur (1997). French Aircraft of the First World War. Mountain View, CA: Flying Machines Press. pp. 25–26. ISBN 978-0-9637110-4-5.
- ^ Owers, Colin A.; Jon S. Guttman; James J. Davilla (2001). Salmson aircraft of World War I. Boulder, CO: Paladin Press. ISBN 1-891268-16-3.
Bibliography
[edit]- Méchin, David (April 2023). "Le Salmson 2A2: Bonne surprise sous l'uniforme, Première partie" [The Salmson 2A2: A Pleasant Surprise under the Uniform, Part 1]. Le Fana de l'Aviation (in French) (641): 62–70. ISSN 0757-4169.
- Méchin, David (May 2023). "Le Salmson 2A2: Le guerrier de retour au civil" [The Salmson 2A2: The Warrior Returns to Civil Life]. Le Fana de l'Aviation (in French) (642): 68–75. ISSN 0757-4169.
- Morareau, Lucien (February 1990). "Histoire de l'Aviation Embarquée en France: La 4eme Flotille, de la reconnaissance au bombardement". Le Fana de l'Aviation (in French) (243): 14–17, 19–21. ISSN 0757-4169.
Further reading
[edit]
Wikimedia Commons has media related to Salmson 2.
- Hirschauer, Louis; Dollfus, Charles, eds. (1920). L'Année Aéronautique: 1919−1920. Paris: Dunod. p. 33. OCLC 7049186.
Salmson 2
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Design and development
Background and requirements
In 1916, the French Army issued a specification for a new two-seat reconnaissance biplane to address the shortcomings of existing aircraft in frontline roles, particularly the outdated Dorand AR series, Sopwith 1½ Strutter, and earlier Salmson designs such as the Salmson-Moineau S.M.1, which lacked sufficient speed, range, and stability for effective artillery spotting and aerial photography amid intensifying aerial threats.[1] The requirement emphasized a robust platform capable of operating closer to enemy lines with enhanced performance to improve survivability and mission accuracy, building on lessons from earlier reconnaissance types that proved vulnerable to fighter interception.[1] Salmson's entry, developed in early 1917 under the A2 (two-seat army cooperation) specification, was evaluated against competing designs, with particular focus on the integration of Salmson's own 9-cylinder radial engine for reliable power output.[7] After successful trials in April 1917, the Salmson 2 was selected for production due to its superior handling and structural integrity compared to rivals, marking a shift toward more modern tractor biplane configurations in French aviation.[7] The initial design goals prioritized operational effectiveness, targeting a maximum speed exceeding 180 km/h, an endurance of approximately 3 hours, and a service ceiling above 6,000 m to enable safer patrols and coordination with ground forces behind enemy lines.[1] These parameters were critical for fulfilling the French Army's demands for a versatile observation aircraft that could evade pursuit while carrying photographic equipment and forward artillery corrections, ultimately positioning the Salmson 2 as a cornerstone of late-war reconnaissance efforts.[7]Engineering and features
The Salmson 2 employed a conventional two-bay biplane configuration with equal-span wings measuring 11.75 meters, designed for inherent stability during reconnaissance flights over contested airspace. The airframe featured a wooden structure throughout the fuselage and wings, covered in fabric for lightweight strength, and reinforced by interplane struts and wire bracing to withstand the stresses of aerial operations. This construction addressed the need for a robust yet maneuverable platform capable of evading enemy fighters while carrying photographic equipment and defensive armament.[1][2] Powering the aircraft was the Salmson 9Z (or 9Za), a nine-cylinder water-cooled radial engine rated at 230 horsepower, mounted in the nose and driving a two-bladed fixed-pitch wooden propeller. The engine's compact radial layout allowed for a frontal radiator to manage cooling during prolonged low-altitude missions, while the fuel system provided approximately 265 liters of capacity in protected tanks to support extended endurance. Developed in response to French Army specifications issued in 1916 for a reliable two-seat observation plane, these mechanical elements emphasized reliability and range over speed.[8][9] The cockpit arrangement positioned the pilot in a forward open bay for optimal forward visibility and control, with the observer and gunner in a rear open cockpit equipped with camera mounts and a trainable ring for machine guns. The wide separation between cockpits posed significant communication challenges, relying on hand signals or written notes until rudimentary intercom systems were retrofitted in late 1918 models. This layout prioritized the observer's role in reconnaissance and defense but highlighted early limitations in crew coordination.[7] For survivability, the Salmson 2 incorporated self-sealing fuel tanks to mitigate fire risks from ground fire or enemy bullets, a critical innovation for frontline operations. The fixed conventional landing gear, with V-struts and shock absorption via rubber cords, enabled operations from unprepared forward airfields typical of World War I battle zones. These features collectively enhanced the aircraft's resilience in the demanding role of short-range tactical reconnaissance.[10][1]Production history
The first prototype of the Salmson 2 conducted its maiden flight in April 1917, following initial development to meet French military reconnaissance requirements.[7] After rigorous evaluation at the Villacoublay military airfield, including performance trials that confirmed its suitability for frontline use, the aircraft entered service with the French Aviation Militaire in October 1917.[10] This rapid transition from prototype to operational deployment underscored the urgent need for reliable two-seat reconnaissance platforms amid escalating World War I demands. Primary manufacturing responsibility fell to the Société des Moteurs Salmson at its Billancourt facility near Paris, where the company leveraged its expertise in radial engine production to assemble the airframes. To meet surging wartime orders, Salmson subcontracted assembly to several firms: Latécoère produced approximately 300 units, Hanriot over 500, and Desfontaines more than 200, contributing to a total French output of around 3,200 Salmson 2 aircraft by the Armistice in November 1918.[11] Of these, Salmson itself built about 2,200 at Billancourt, integrating the Salmson 9Z radial engine directly into the production line for streamlined assembly.[10] Production scaled significantly during the conflict, reaching a peak rate of approximately 200 units per month by mid-1918 as French industrial capacity expanded to support Allied air operations.[1] However, manufacturers faced notable hurdles, including intermittent shortages of raw materials like aluminum and steel due to wartime rationing, as well as delays in Salmson 9Z engine supplies amid competing demands from other aircraft programs.[12] Post-Armistice, limited production continued at Billancourt primarily for export markets, with several hundred additional units completed through 1919 to fulfill outstanding contracts. In 1918, the French government authorized a licensing agreement with Japan for local manufacture of the Salmson 2, designating it the Army Type Otsu 1 and assigning production to facilities like the Tokyo Artillery Arsenal and Kawasaki Shipyards.[13] Japanese output began in 1922 and continued into the mid-1920s, with estimates varying due to incomplete records; sources indicate between 300 and 1,000 units were built, though a commonly cited figure is around 600.[14][15] This licensed production extended the aircraft's legacy beyond Europe, supporting Imperial Japanese Army aviation training and reconnaissance needs.Variants
Primary military variants
The Salmson 2 A.2 served as the primary two-seat reconnaissance variant of the Salmson 2 biplane, developed to meet French military requirements for a robust, short-range observation aircraft during the final stages of World War I.[2] Powered by a 260 hp Salmson (Canton-Unné) 9Z nine-cylinder water-cooled radial engine, it accommodated a pilot and observer in open cockpits, with the airframe constructed primarily of wood and fabric for a balance of strength and light weight.[4] The design emphasized reliability and ease of maintenance, allowing it to replace earlier underpowered and fragile reconnaissance types like the Dorand A.R. 1 and Sopwith 1 A.2 in frontline service.[2] Armament on the Salmson 2 A.2 typically included a single 0.303-inch Vickers machine gun synchronized to fire through the propeller arc for the pilot, providing forward defensive fire, while the observer operated two 0.303-inch Lewis machine guns mounted on a trainable rear cockpit ring, enabling flexible coverage against pursuing aircraft.[1] By mid-1918, this configuration became standardized across French and American units, with the ring mount—often a Scarff type—enhancing the observer's field of fire, and some aircraft receiving an improved pilot windscreen to reduce airflow interference and boost visibility during low-level missions.[7] Production reached approximately 3,200 units, with manufacturing handled by Salmson and subcontractors such as Latécoère, Hanriot, and Amiot, enabling widespread deployment in 19 French reconnaissance squadrons and several U.S. Army Air Service units by war's end.[1] A minor adaptation, the Salmson 2 B.2, emerged as a rare bomber variant in late 1918, featuring underwing racks for light ordnance loads of up to 24 anti-personnel bombs, though it saw only brief operational use in select French escadrilles for ground support roles.[7] This configuration retained the core reconnaissance structure but prioritized modest bomb-carrying capability over extended range, reflecting the aircraft's versatility in tactical scenarios without significant redesign.[4] Overall, the primary military variants prioritized reconnaissance duties, contributing substantially to Allied aerial intelligence efforts in the war's closing months.Trainer and experimental variants
The Salmson 2 E.2 was a dual-control trainer variant adapted from the standard reconnaissance model, featuring modifications to the rear cockpit to accommodate a student pilot, along with added throttle and rudder linkages for instructional purposes.[16] This configuration addressed limitations in crew communication inherent to the base Salmson 2's tandem seating arrangement.[1] Introduced in 1918, it served primarily for advanced reconnaissance training within French aviation units, with approximately 100 units produced to support pilot instruction amid wartime demands. The Salmson 4 Ab.2 represented an experimental armored ground-attack prototype derived from the Salmson 2 airframe, enlarged to incorporate reinforced fuselage armor weighing up to 300 kg for enhanced protection against ground fire.[17] It was equipped with dual synchronized machine guns for forward fire, aligning with the French STAé's Ab.2 specification for low-level assault roles.[18] Tested in 1918 with a 260 hp Salmson 9Z radial engine, the added weight severely impacted performance, reducing maximum speed to around 168 km/h at sea level and extending climb times significantly, such as 20 minutes to 4,000 m.[17] Only 12 examples were completed before production ceased, limiting its frontline evaluation by escadrilles prior to the Armistice.[18] Developed in late 1918 as a refinement to the Salmson 2 for improved observer-pilot interaction, the Salmson 7 A.2 featured a novel back-to-back seating arrangement within a single elongated cockpit tub, eliminating the communication barriers of separate cockpits.[19] Powered by a 260 hp Salmson (Canton-Unné) 9Z engine and fitted with swept wings for better stability, it achieved a top speed of 189 km/h during trials.[19] Although an initial order supported delivery of 20 units to army cooperation squadrons, the variant's program was curtailed by the end of hostilities in November 1918, rendering further development obsolete in the post-war environment.[19]Foreign and civilian adaptations
The Kawasaki Otsu-1 was a license-built version of the Salmson 2.A2 reconnaissance biplane produced for the Imperial Japanese Army, with manufacturing commencing in 1922 following the import of 29 examples in 1919 for evaluation and training purposes.[15] Kawasaki handled local production of both the airframe and a copy of the 260 hp Salmson (Canton-Unné) 9Z nine-cylinder radial engine at its Hyogo Works, resulting in approximately 300 units built there, though total Japanese production estimates range up to 1,000 due to contributions from other facilities and incomplete records.[13][20] These aircraft served in reconnaissance roles into the mid-1920s, including operations in Siberia in 1922 and China in 1931, before being phased out by 1933.[21] Post-World War I, surplus Salmson 2 airframes underwent conversion to civilian passenger configurations, adapting the biplane's robust structure for non-military transport. The Salmson Limousine variant, introduced around 1919, featured an enclosed four-passenger cabin and retained the standard 260 hp Canton-Unné 9Z engine, enabling early commercial operations by airlines such as Ligne Aériennes Latécoère in the early 1920s; roughly 20 examples were produced from demilitarized stock.[1][22] Similarly, the Salmson 2 Berline emerged post-1920 as a luxury adaptation for executive transport, with enhancements for passenger comfort including a fully enclosed fuselage and extended range capability approaching 600 km through optimized fuel systems, though only a small number were built for limited civil use.[1] These adaptations highlighted the Salmson 2's versatility in transitioning from wartime reconnaissance to peacetime aviation, bridging military surplus with emerging commercial demands.Operational history
Service in World War I
The Salmson 2 entered service with the French Aéronautique Militaire in late 1917, becoming a primary reconnaissance platform alongside the Breguet 14 and equipping numerous escadrilles for artillery spotting, photographic surveys, and escort duties for bomber formations. By late 1918, it comprised one-third of the French reconnaissance fleet, replacing earlier types such as the Sopwith 1 A.2 Strutter and Dorand A.R. series. Units like Escadrille SAL 16 and Escadrille SAL 259 operated the aircraft from bases such as Pretz-en-Argonne, conducting low-level patrols to support ground advances in the final months of the war.[23][24][25] The American Expeditionary Force (AEF) adopted the Salmson 2A2 in spring 1918, with the first deliveries arriving in April and squadrons including the 1st, 12th, 24th, and 91st Aero Squadrons receiving the type to bolster observation capabilities during the closing stages of the conflict. These units, part of the 1st Army Observation Group, flew the aircraft from fields in Lorraine and the Argonne sector, accumulating significant flight hours on missions such as visual reconnaissance, infantry contact patrols, and artillery adjustment—examples include the 1st Aero Squadron logging 36 hours and 20 minutes over multiple sorties, while the 12th recorded 24 hours and 20 minutes in similar roles. The Salmson 2's defensive armament enabled it to engage enemy fighters, with the 12th Aero Squadron downing a German biplane over Regnieville and the 24th crediting a victory on September 15, 1918; aces like 1st Lt. William T. Badham of the 91st achieved multiple kills while escorting Salmsons, and even pursuit pilot Frank Luke Jr. briefly supported reconnaissance flights by protecting Salmson formations from interception. American pilots flying the Salmson 2 achieved notable successes, including ace Lt. William Portwood Erwin scoring 8 aerial victories.[26][23][27][4][2] During the Meuse-Argonne Offensive from September 26 to November 11, 1918, the Salmson 2 played a defensive and tactical role, providing constant aerial surveillance despite adverse weather and intense German opposition from Fokker D.VII fighters, which inflicted losses including crashes into balloon cables and missing crews from the 24th Aero Squadron. Squadrons like the 50th and 91st conducted aggressive low-altitude patrols—often below 100 feet—for infantry liaison, driving off enemy observation planes and supporting the advance of over a million American troops; one notable engagement saw a Salmson repel a German aircraft over Allied lines on October 3. Overall, the type's reliability in these operations contributed to enhanced Allied air superiority in the war's final push, with observation aviation highlighted as a high point of AEF performance despite vulnerabilities to superior German pursuits.[26][28]Interwar and later use
Following the Armistice of 1918, the Salmson 2 transitioned to peacetime roles, notably in early airmail operations. In 1919, Latécoère Airlines adopted the Salmson 2-A2 as its initial airmail aircraft for the inaugural France-to-Morocco route, marking one of the first regular international airmail services.[29] Modified versions featured enhanced fuel capacity to achieve a range of up to 800 km, enabling reliable short-haul postal flights despite the aircraft's open cockpit and wooden biplane construction.[29] Didier Daurat, as head of operations, oversaw these expeditions with strict discipline, establishing the "Spirit of the Line" that emphasized punctuality and safety in the nascent aviation network, which later expanded toward South American routes by the mid-1920s, though the Salmson was gradually supplanted by longer-range designs like the Breguet 14.[29] Export orders sustained the Salmson 2's military utility in the early interwar period. The Czechoslovak Air Force acquired postwar examples for reconnaissance and training duties, maintaining them in service until 1924.[7] In Poland, Salmson 2s supported operations during the 1919–1920 border conflicts, including the Polish-Soviet War, where escadrille SAL 582 (later redesignated as the 1st Reconnaissance Squadron) deployed them for tactical reconnaissance in the war's opening phases.[7] Japan's Imperial Army licensed production as the Kawasaki Otsu-1, deploying it during the Siberian Intervention from 1918 to 1922 for reconnaissance in the Russian Far East before repurposing it for domestic training roles into the 1930s.[7] Limited Soviet evaluations occurred in 1920, with four aircraft assigned to the Siberian Air Fleet of the Far Eastern Republic, a provisional buffer state aligned with Bolshevik interests.[7] By the mid-1920s, the Salmson 2's obsolescence—stemming from its modest speed, limited payload, and vulnerability to advancing fighter designs—led to its phase-out across most operators, confining it to secondary or reserve roles.[7]Military operators
Allied forces during wartime
The French Aviation Militaire was the primary operator of the Salmson 2 A.2 during World War I, integrating it into its reconnaissance forces from mid-1918 onward. By November 1918, the aircraft equipped 52 escadrilles, forming the backbone of French aerial observation capabilities along the Western Front.[11] These units, including Escadrille SAL.259, conducted frontline reconnaissance missions from airfields such as Poix and Gondreville-sur-Moselle, supporting artillery spotting and infantry coordination in the closing stages of the war.[30] The United States Army Air Service's American Expeditionary Force (AEF) adopted the Salmson 2 A.2 as its standard observation aircraft, receiving 705 examples to outfit ten squadrons by late 1918.[2] Key units included the 1st Aero Squadron, 12th Aero Squadron, 24th Aero Squadron, and 91st Aero Squadron, which flew from bases like Gondreville-sur-Moselle and participated in major offensives. During the St. Mihiel offensive in September 1918, for instance, the 1st Aero Squadron operated 24 Salmson aircraft for visual reconnaissance and photography, while the 91st conducted patrols over the Apremont and Pont-a-Mousson sectors; these squadrons later supported the Meuse-Argonne campaign with similar roles.[26][31] Belgian Aviation Militaire units saw limited employment of the Salmson 2 A.2 in 1918, primarily for observation duties near the Ypres salient. Up to three aircraft were acquired, including one confiscated "war-orphaned" example by the 4th Escadrille at Hondschote airfield, enabling brief reconnaissance operations in support of ground forces before the Armistice.[32][7]Post-war and other operators
Following the end of World War I, the Salmson 2 continued to serve in various air forces around the world, primarily in reconnaissance roles. In Czechoslovakia, the Czechoslovak Air Force purchased approximately 50 Salmson 2 A.2 observation aircraft in 1919, which entered service and remained operational until 1924.[7] These aircraft were utilized by early flight regiments for general reconnaissance duties.[25] Poland received Salmson 2A2 aircraft post-war and employed them in multiple reconnaissance squadrons, including the 580th, 581st, and 582nd, during the Polish-Soviet War of 1919–1920.[33] Approximately 15 such aircraft were in use by the Polish Air Force at the time, supporting observation and light bombing missions before retirement around 1922.[7] Peru acquired four Salmson 2 aircraft in November 1919 as part of a French aviation mission, assigning them to the Escuela de Aviación Militar for coastal reconnaissance in the 1920s.[7][34] Spain imported a batch of Salmson 2 aircraft in 1920, including at least one for evaluation by the Servicio de Aeronáutica Militar, with some allocated to the Civil Guard for patrol duties.[7][1] The Soviet Union captured Salmson 2 aircraft during the Russian Civil War, including one in 1919 and another in 1922; by 1923, at least nine were overhauled and used for reconnaissance training and operations in the early interwar period.[7][1] Greece received a small number of Salmson 2 A.2 aircraft post-war for reconnaissance roles in the Hellenic Air Force during the early 1920s.[11] Japan license-produced the Salmson 2 as the Otsu-1 reconnaissance aircraft, with approximately 350 built; these served in units such as the 7th and 8th Flying Brigades until the 1930s.[35][7]Preservation
Surviving airframes
Partial remains of a Japanese license-built variant, the Kawasaki Otsu-1, including a nose section, are preserved at the Kakamigahara Aerospace Science Museum in Japan, recovered from an original aircraft.[36][37] No complete surviving airframes are documented worldwide as of 2025, and there are no fully airworthy examples.[38]Museum displays
The Gifu-Kakamigahara Air and Space Museum in Kakamigahara, Japan, houses a full-scale replica of the Kawasaki Otsu-1, the Imperial Japanese Army's licensed version of the Salmson 2 A.2 reconnaissance aircraft, alongside the partial original remains. This static display, constructed in 1995 using historical documents, has been exhibited since the museum's opening and features the aircraft painted in authentic Imperial Army markings. Accompanying interpretive panels provide context on Kawasaki's license production of over 300 units between 1917 and 1927, emphasizing the type's role in early Japanese aviation.[20][39][40] The National Museum of the United States Air Force in Dayton, Ohio, preserves a two-blade wooden propeller from a World War I-era Salmson biplane in its collection, donated in the mid-20th century and currently in storage. This artifact illustrates the type's use by American units.[41] The National Air and Space Museum in Washington, D.C., displays a static wood and metal model of a United States Army Air Service Salmson 2 A.2 reconnaissance aircraft in green and tan camouflage with cream undersurfaces, representing its World War I service.[5]Specifications
General characteristics
The Salmson 2 A.2 was a conventional two-bay biplane reconnaissance aircraft accommodating a crew of two, consisting of a pilot and an observer.[1] Its overall dimensions included a length of 8.5 m, a wingspan of 11.75 m, a height of 2.9 m, and a wing area of 37.27 m².[42] The aircraft had an empty weight of 780 kg and a gross weight of 1,290 kg.[42] It was powered by a single Salmson (Canton-Unné) 9Z nine-cylinder water-cooled radial piston engine producing 260 hp.[4] The propeller was a two-bladed fixed-pitch wooden unit, and the fuel capacity totaled approximately 265 L.[9][10]Performance
The Salmson 2 A.2 exhibited reliable flight characteristics suited to its reconnaissance role, with official tests confirming a maximum speed of 188 km/h (117 mph) at sea level and a cruise speed of 165 km/h (103 mph).[9][2] Its operational range measured 500 km (310 mi), supported by an endurance of approximately 3 hours, while the service ceiling attained 6,250 m (20,500 ft).[1][4] The aircraft achieved a rate of climb of 5.25 m/s (1,030 ft/min), enabling it to reach 1,000 m in 3 minutes 18 seconds during standardized evaluations.[9][2] Powered by a 260 hp Salmson 9Z radial engine, these metrics underscored its effectiveness in frontline conditions as validated by STAé trials in 1917.[2]Armament
The Salmson 2 A.2 featured a standard armament configuration optimized for defensive protection during reconnaissance flights, with limited offensive capability. The pilot controlled a single fixed, forward-firing 7.7 mm Vickers machine gun, synchronized to fire through the propeller disc without striking the blades.[1][9] In the rear cockpit, the observer operated a flexible 7.7 mm Lewis gun (or occasionally a Vickers) mounted on a Scarff ring, providing coverage for rear and upper defense against pursuing aircraft.[7][2] Some configurations allowed for a second Lewis gun on the same mount to enhance firepower.[9] Field modifications enabled light bombing (up to 230 kg of ordnance) and ground-attack missions, though the standard load remained modest to preserve the aircraft's reconnaissance performance.[43][2] Beyond weaponry, the Salmson 2 included provisions for a camera mount in the observer's position to support aerial photography missions.[9] The design did not accommodate torpedoes or heavy ordnance, aligning with its classification as a light two-seat biplane unsuitable for maritime strike or major bombing operations.[7]References
- https://commons.wikimedia.org/wiki/File:Remains_of_Kawasaki_Army_Otsu-1_-ID_unknown-_%2848128367447%29.jpg