Otto C.I

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Otto - B - 1914 - Германия Otto - C.II - 1915 - Германия

Страна: Германия

Год: 1915

O.Thetford, P.Gray German Aircraft of the First World War (Putnam)

Otto C I (1915)
A disused airframe on public display. Note kink in ailerons to give wash-out, as on L.V.G. machines. Engines, 150 h.p. Benz Bz III. Span, 14.5 m. (47 ft. 7 in.). Weights: Empty, 915 kg. (2,013 lb.). Loaded, 1,500 kg. (3,300 lb.). Armament, one Parabellum machine-gun in front cockpit.

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J.Herris Otto, AGO and BFW Aircraft of WWI (A Centennial Perspective on Great War Airplanes 37)

Otto C.I

   Whereas many operational Allied aircraft were pushers, the Otto C.I was one of the very few German aircraft to use that configuration. A partial explanation for this is because the Otto company was located in Munich, Bavaria, and the Bavarian air service, which purchased Otto aircraft, was independent of the Prussian-controlled German air service up until about 1915. The German air service strongly preferred tractor aircraft and most production German two-seaters were of that configuration, but, like France and Britain, the Bavarian air service initially favored pusher aircraft. To the Bavarians, the chief benefit of pusher two-seaters was the unobstructed forward visibility for the crew for observation, photography, and bombing.
   Consequently, when in 1912 the Bavarian air service started purchasing aircraft in earnest, 17 Otto pushers (unarmed two-seater biplanes) and six Euler pushers were obtained. The primitive and underpowered Otto B-types with which the Bavarians started combat operations in August 1914 were replaced with LVG and Albatros B-type biplanes starting in December 1914. Thus, in early 1915 the aircraft destined to become the Otto C.I was begun as a private venture to replace the obsolete Otto B-types.
   The prototype of the new aircraft, known as the Otto KD 15, performed its first flight in late May or early June 1915 powered by a 165 hp Austro-Daimler six-cylinder engine. It had twin booms to reduce drag compared to the Otto B and its wing planform and cranked ailerons were based on that of the LVG B-type biplanes then being produced by Otto under license. The prototype KD 15, later to become known as the Otto C.I, was totally constructed of Duralumin, quite an innovation for the time, which saved 200 kg or more of weight compared to steel tubing. However, since Duralumin could not be welded or soldered, the joints had to be connected with bolted sleeve clamps. A four-wheeled undercarriage was mounted to help prevent nose-overs on rough fields and, unlike most aircraft of the time, the rear wheels had brakes.
   The second Otto KD 15 was initially flown with a larger wing than the first prototype, but after being damaged in a hard landing on 7 July 1915, it was rebuilt with wings of reduced span in August. The second prototype also featured a 200 hp Rapp engine and wooden fairings on its metal struts to reduce drag.
   Because the Otto firm was financially distressed, Gustav Otto, the owner, requested and received a production order for six Otto C.I aircraft in August. These six aircraft, designated Otto C.I 544/15 to 549/15, were followed by an order for an additional six aircraft, designated C.I 1115/15 to 1120/15, in November. In addition, the first prototype was purchased after the initial production order had been placed and was given number C.I 3633/15, and the second prototype may also have been purchased for use.
   Production Otto C.I aircraft were powered by a variety of engines, including the 200 hp Rapp, the 160 hp Mercedes, and the 150 hp Benz. Despite its higher power rating, the Rapp was unpopular because it was not nearly as reliable as the Mercedes or Benz, which were strongly preferred for service use. Rapp, located in Bavaria, was later purchased by new owners and reorganized as the Bavarian Motor Works, which then produced the excellent 185 hp BMW.III engine of 1918.
   Easy to fly but with a limited operational ceiling of only about 3,000 metres (9,800 feet) when fully equipped, in German service the Otto C.I served only with Bavarian units such as Flieger-Abteilung 4b, 8b, and 9b, and was soon relegated to training units, where the remaining aircraft were converted to dual controls for pilot training.

Bulgarian Service

   The Otto C.I first batch served with Bavarian Flieger-Abteilungs and one with Prussian FFA58 before it was converted to training service. In 1915 a Bulgarian purchasing commission visited Munich and were taken to see the Otto Werke, where about a dozen Otto C.I aircraft were in storage. The aircraft were available immediately and the Bulgarians bought them all.
   In Bulgarian service the Otto C.I aircraft seemed to be used in action only by the 2nd Aeroplane Otdelenie based at Udovo and others were at the Aeroplane School at Bojurishte.
   Thirteen Otto C.I two-seat twin-boomed biplanes (powered by the 150 hp Benz Bz.III) were delivered to Bojurishte in the spring of 1916. They were used by 2 Aeroplane Otdelenie at Udovo airfield in the bombing and reconnaissance roles. These were still used at the start of 1917 for reconnaissance but soon withdrawn in favor of the Albatros C.III. The known serial numbers appear in the nearby table.

Otto C.I Aircraft Production
   Production Serials Qty Notes
   Prototype C.3633/15 1 At Schleifiheim school (2nd prototype serial unknown)
   1st batch C.544/15-549/15 6 Primarily used by Bavaria (mostly FFA 2b, FFA 4b, FFA 9b, Si FFA 58)
   2nd batch C.1115/15-1120/15 6 Bulgaria
   3rd batch C.3575/15-3580/15 6 Bulgaria

Bulgarian Otto C.I Aircraft
   Serial Delivered Notes:
   C.1115/15 1916 Shown at 2 Otdelenie. Suffered minor crash but appears to have been repaired.
   C.3575/15 1916
   C.3579/15 1916
   C.3580/15 1916
   Probably all Bulgarian Otto C.I aircraft were from production series 2 & 3.

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Описание:Description:

O.Thetford, P.Gray German Aircraft of the First World War (Putnam)
J.Herris Otto, AGO and BFW Aircraft of WWI (A Centennial Perspective on Great War Airplanes 37)
M.Dusing German Aviation Industry in WWI. Volume 1 (A Centennial Perspective on Great War Airplanes 84)

J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Otto C.I C.545/15. Armee Abteilung Gaede. Black/White bands are the unit marking.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Otto C.I C.546/15. Fl.Abt.9b (part of Armee Abteilung Gaede). Black/White bands are the unit marking.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Otto C.I C.546/16. After being withdrawn from front-line service, the aircraft was converted to a dual-control trainer. Unit markings were painted over, and to conserve rubber, the rear wheels were replaced by wooden wheels.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Otto C.I, serial number and unit unknown. Many Otto C.I aircraft had the extra national insignia on white background on the nose.

J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

The Otto KD 15 prototype was later purchased by Prussian authorities and designated C.I C.3633/15.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

The Otto KD 15 prototype after being designated Otto C.I C.3633/15.The engine was a 165 hp Austro-Daimler whose exhaust pipe was led through the upper wing.The struts were not faired to reduce drag.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)
M.Dusing - German & Austro-Hungarian Aero Engines of WWI. Vol.3 /Centennial Perspective/ (66)

The second Otto KD 15 prototype was powered by a 200 hp Rapp engine and had an extended wing span. The steel-tube struts were now streamlined with wood to reduce drag; as a result a 25 km/h speed advantage was claimed. The nacelle appears to be covered with plywood. After a few flights the aircraft was damaged on 7 July 1915. It was rebuilt with wings of reduced span and was completed on 24 August 1915.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

The Otto KD 15 second prototype after its accident and shorter wings were fitted. The struts were faired with wood.
J.Herris - Development of German Warplanes in WWI /Centennial Perspective/ (1)

Thought to be the Otto KD 15 second prototype after modifications. This aircraft was apparently later accepted as a production aircraft. In addition to two prototypes, 18 production Otto C.is are thought to be built.
The Otto C.I was one of the few German pusher designs. This was because the Otto company was located in Munich, Bavaria, and the Bavarian air service, which purchased Otto aircraft, initially favored pusher aircraft, primarily due to the unobstructed forward visibility for the crew for observation, photography, and bombing. The German air service strongly preferred tractor aircraft for their aerodynamic efficiency and, later, better defensive capability, and most production German two-seaters were tractor designs. Engines used included the 160 hp Mercedes, 150 hp Benz, and 200 hp Rapp. Despite its higher power rating, the Rapp was unpopular because it was not nearly as reliable as the Mercedes or Benz.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

The Otto KD 15 second prototype with original extended wings before its accident and shorter wings were fitted.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

The first production Otto C.I was designated C.544/15 as marked on the nacelle side. The engine is a 200 hp Rapp, an unreliable design used in some aircraft because the superior Mercedes, Benz, and Argus engines were in short supply. The aircraft above was photographed at FFA 58.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Production Otto C.I C.545/15 was powered by a 160 hp Mercedes D.III; some other aircraft in this batch had the 150 hp Benz Bz.III engine. The black and white markings on the tail boom are the markings of the units of Armee-Abteilung Gaede.The black & white bands around the tail booms were to differentiate the Otto C.I and Ago C.I from French pushers in the air and prevent the Ottos and Agos from being attacked by mistake by other German aircraft.
M.Dusing - German & Austro-Hungarian Aero Engines of WWI. Vol.3 /Centennial Perspective/ (66)

Otto C.I 545/15.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Production Otto C.I C.546/15 was marked on the nacelle side while serving with Armee-Abteilung Gaede.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Otto C.I C.546/15 after being converted to dual-control and relegated to a Bavarian training unit.The overall color has been darkened but the previous markings are still somewhat visible. Due to the shortage of rubber, the rear wheels are wooden ersatz wheels.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

German and Turkish airmen with an Otto C.I during training at Schleissheim air station (FEA 1b).The German airman standing in the center of the group in front (with goggles and scarf in photos) is instructor Max Holtzem (Pfalz test pilot and later a Pfalz D.IIIa pilot with Jasta 16b). Holtzem said he couldn't speak Turkish and the Turks didn't speak German, but they managed to communicate in their "schoolboy French"
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Loading a bomb on an Otto C.I.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Otto C.I serving with a front-line unit. Note the side radiators. Early national insignia are painted on white squares on the front and sides of the nacelle.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Otto C.I aircraft in action.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Mediocre photograph of an unidentified Otto C.I.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

The C.I was marked on the tail boom with the diagonal black and white bands indicating service with Armee-Abteilung Gaede.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Otto C.I serving with a front-line unit with unit markings on the tail booms and pennants attached to the bottom of the outer rear interplane struts. The national insignia are painted on white squares inboard on the wings and on both sides of the rudders.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Unidentified Otto C.I on display.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Rear view of an Otto C.I
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Unidentified Otto C.I in the field. No national insignia is on the nose.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Front view of an Otto C.I
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Otto C.I aircraft in action.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Unidentified Otto C.I in flight.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Unidentified Otto C.I in flight.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Unidentified Otto C.I in the air. Note the inboard placement of the national insignia.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Unidentified Otto C.I in the air. Note the inboard placement of the national insignia.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Otto C.I serving with the Bulgarian air service.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Otto C.I serving with the Bulgarian air service.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Otto C.I of the Bulgarian air service with food containers; was it used to resupply its unit?
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Otto C.I of the Bulgarian air service appears ready for its next mission.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Otto C.I serving with the Bulgarian air service prepares for a light bombing mission
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Otto C.I C.1115/15 serving with the Bulgarian air service. Standard German national insignia were used.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

C.1115/15 has run off the cleared airfield surface into brush that has caused some damage.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

The central nacelle of an Otto C.I serving with the Bulgarian air service is retrieved by a truck after a crash.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

Otto C.I C.3580/15 photographed after the war in Bulgaria by the RAF for report #8309.These three photos of the Bulgarian C.I were included as part of the report. The rubber tires have been removed.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

This Otto C.I has suffered an undercarriage failure despite its robust construction. It has identification pennants on the wing tips and a national insignia on the nose of the nacelle.
J.Herris - Otto, AGO and BFW Aircraft of WWI /Centennial Perspective/ (37)

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