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WORLD WAR 1

SPAD S.XI


Biplane Fighter Aircraft (1917)


Aviation / Aerospace

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Jump-to: Specifications

The two-seat SPAD S.XI was dogged by issues which led to limited production during World War 1.



Authored By: Staff Writer | Last Edited: 06/04/2018 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.
The storied engineering career of Frenchman Louis Bechereau spanned decades and several popular designs during World War 1 (1914-1918). Hired by Armand Deperdussin to head design at Societe de Production des Aeroplanes Deperdussin ("S.P.A.D."), Bechereau delivered the early SPAD S.VII and later SPAS S.XIII. In between these two notable designs fell the oft-forgotten SPAD S.XI, a two-seat reconnaissance-minded biplane fighter attempting to fulfill Specification C2 for the French Air Service. The SPAD S.XI did not prove itself an outright success as other SPAD designs did and witnessed only a short shelf-life during the war, dogged by issues throughout its career. This led to a rather limited production reach of about 1,000 aircraft in the series.

To fulfill the French air Service (Aeronautique Militaire) requirements, Bechereau attempted to continue using the proven qualities of his previous single-seat biplane fighter offerings. A longer fuselage was necessary when incorporating a second observer's/gunner's cockpit aft of the pilot. Sections of the wings were cut out for improved viewing while many other qualities of the design remained consistent with the period - the front-mounted engine driving a two-bladed wooden propeller, parallel struts and cabling to stiffen and control the "over-under" wing structure and conventional single-finned tail unit. The undercarriage was wheeled though fixed through reinforced struts and the tail supported by a simple skid. The pilot was given a single fixed, forward-firing 7.7mm Vickers series machine gun and the observer could manage an optional 7.7mm Lewis machine gun on a trainable mounting. The aircraft emerged under the company model number of "SPAD 11", also written as SPAD S.XI.

Power to the S.XI was served through 1 x Hispano-Suiza 8Bc series V-8 water-cooled engine of 200 horsepower and this allowed a maximum speed was 112 miles per hour with an mission endurance time of approximately 2.25 hours. The aircraft's service ceiling was listed at 23,000 feet with a rate-of-climb of 9,850 feet reached in roughly 12.5 minutes. Some airframes were also fitted with a Renault 12-cylinder engine instead of the aforementioned Hispano-Suiza installation, though this powerplant actually reduced performance figures and was not popular.

The SPAD S.XI joined the war during 1917 and eventually proved itself not a success. The modified single-seat fighter approach for a larger two-seat design made the airframe tricky in its handling while performance from the engine of choice proved underwhelming. The type did hold characteristics that superseded some existing types then in service with French forces so the aircraft still managed to serve in notable numbers. It managed a frontline status until the fall of 1918 before being replaced by the SPAD S.XVI - itself a direct offshoot of the S.XI though outfitted with a Lorraine-Dietrich engine of 250 horsepower. These proved no better than the originals but were kept in action nonetheless.

Operators beyond the French Air Service became Belgium, Italy, Japan, Russia (into the Soviet Union years), Uruguay and the United States (American Expeditionary Force - "AEF").

Specifications



Service Year
1917

Origin
France national flag graphic
France

Status
RETIRED
Not in Service.
Crew
2

Production
1,000
UNITS


Societe Pour l'Avions et ses Derives (SPAD) - France
National flag of Belgium National flag of France National flag of Italy National flag of the Kingdom of Italy National flag of modern Japan National flag of Russia National flag of the Soviet Union National flag of the United States National flag of Uruguay Belgium; France; Kingdom of Italy; Imperial Japan; Imperial Russia; Soviet Union; United States; Uruguay
(OPERATORS list includes past, present, and future operators when applicable)
Air-to-Air Combat, Fighter
General ability to actively engage other aircraft of similar form and function, typically through guns, missiles, and/or aerial rockets.
Intelligence-Surveillance-Reconnaissance (ISR), Scout
Surveil ground targets / target areas to assess environmental threat levels, enemy strength, or enemy movement.


Length
25.7 ft
(7.84 m)
Width/Span
36.8 ft
(11.21 m)
Height
9.2 ft
(2.80 m)
Empty Wgt
1,499 lb
(680 kg)
MTOW
2,293 lb
(1,040 kg)
Wgt Diff
+794 lb
(+360 kg)
(Showcased structural values pertain to the SPAD S.XI A2 production variant)
Installed: 1 x Hispano-Suiza 8Bc V-8 water-cooled engine developing 220 horsepower.
Max Speed
112 mph
(180 kph | 97 kts)
Ceiling
22,966 ft
(7,000 m | 4 mi)
Range
249 mi
(400 km | 741 nm)
Rate-of-Climb
788 ft/min
(240 m/min)


♦ MACH Regime (Sonic)
Sub
Trans
Super
Hyper
HiHyper
ReEntry
RANGES (MPH) Subsonic: <614mph | Transonic: 614-921 | Supersonic: 921-3836 | Hypersonic: 3836-7673 | Hi-Hypersonic: 7673-19180 | Reentry: >19030


(Showcased performance specifications pertain to the SPAD S.XI A2 production variant. Compare this aircraft entry against any other in our database. View aircraft by powerplant type)
1 x 7.7mm Vickers fixed, forward-firing machine gun
1 OR 2 x 7.7mm Lewis machine gun on trainable mount in rear cockpit.


Supported Types


Graphical image of an aircraft medium machine gun


(Not all ordnance types may be represented in the showcase above)
Hardpoint Mountings: 0


S.XI - Base Series Designation
S.XI A2 - Formal production model designation


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