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Development and design
The Ca.1 was a three-engine biplane of fabric-covered wooden construction. It had four crew members in an open central nacelle: two pilots, a front gunner, and rear gunner-mechanic, who manned upper machine guns, standing upon the central engine in a protective cage, just in front of the rear propeller. The Ca.1 had a tricycle landing gear.
Italy and Russia were among the first countries to start developing a heavy bomber capability before World War I. The first heavy bomber, designed by Gianni Caproni was a twin-boom biplane, featuring a layout that included three 67 kW (80 hp) Gnome rotary engines housed one behind the other in a central nacelle, the rearmost driving a pusher propeller, and the other two driving tractor propellers mounted on the fronts of the two booms. Referred to by Caproni as the Caproni 260 hp and retrospectively, after the war, as the Ca.30), this design flew in a slightly modified form (later called the Ca.31) in October 1914.
Test flights revealed the power to be insufficient and the engine layout unworkable. Caproni altered the aircraft, retaining the pusher engine in its original location and moving the other two engines to the front of the booms, directly driving the propellers. With more powerful inline engines, the air arm of the Italian Army became interested in purchasing the Caproni 300 hp (later known as the Ca.32), which they designated the Ca.1. A total of 166 aircraft were delivered between August 1915 and December 1916.
Some Ca.1s survived the war to be rebuilt as airliners, able to carry up to six passengers. This conversion became known as the Ca.56 in Caproni's postwar naming scheme.
There is some variation in published sources over early Caproni designations. The confusion stems, in part, from three separate schemes used to designate these aircraft – Caproni's in-house designations of the time, those used by the Italian Army, and designations created after the war by Caproni to refer to past designs.
Operational history
The Ca.1 entered service with the Italian Army in the middle of 1915 and first saw action on August 20, 1915, attacking the Austrian air base at Aisovizza. Fifteen bomber squadrons (1-15 Squadriglia) were eventually equipped with Ca.1, Ca.2, and Ca.3 bombers, bombing mostly targets in Austria-Hungary. The 12th squadron operated in Libya. In 1918 three squadrons (3, 14 and 15) operated in France.
Operators
Development
The Ca.2 was a minor development of the Caproni Ca.1. It had become evident early in the Ca.1's service life that the design could benefit from more power. Caproni therefore replaced the central, pusher engine of the aircraft with a more powerful one. Caproni referred to this as the Caproni 350 hp at the time, and the Italian Army dubbed it the Ca.2. No separate number seems to have been allocated to it in Caproni's postwar redesignation scheme.
Only nine aircraft were built, supplied to the Italian Army alongside deliveries of Ca.1s between August 1915 and December 1916.
The benefits of increased power encouraged Caproni to continue in this direction, leading to the definitive Caproni Ca.3.
Description
Three-engine biplane of a wooden construction, covered with fabric. The crew of four were placed in an open central nacelle (front gunner, two pilots and rear gunner-mechanic). The rear gunner manned upper machine guns, standing upon the central engine in a protective "cage," just in front of a propeller. It had tricycle landing gear.
Armament consisted of two to four Revelli 6.5 mm or 7.7 mm machine guns, one on a front ring mount and one, two or sometimes even three on an upper ring mount. Bombs were suspended under the hull.
Development
The development of the Ca.1 to the Ca.2 suggested the benefits of increasing amounts of power to the very sound airframe. The Ca.3 was a development of Ca.2, by replacing the two engines mounted on the booms with the same Isotta-Fraschini engine that had been used as the central, pusher engine on that design. The prototype flew in late 1916 and was soon put into production. Known by Caproni at the time as the Caproni 450 hp, the Italian Army designated it the Ca.3. In Caproni's postwar renaming, it became the Ca.33. Between 250 and 300 of these aircraft were built, supplying the Italian Army and Navy (the latter using the type as a torpedo bomber), and the French Army. Late in the war, Robert Esnault-Pelterie licence-built an additional 83 (some sources say only 19) aircraft in France.
Note: there is some variation in published sources over early Caproni names. The confusion stems, in part, from three schemes used to label the aircraft – Caproni's in-house designations of the time, those used by the Italian Army and names created after the war by Caproni for past designs.
Description
The Ca.3 was a three-engined biplane of wooden construction, with a fabric-covered frame. The crew of four were placed in an open central nacelle (front gunner, two pilots and rear gunner-mechanic). The rear gunner manned upper machine guns, standing upon the central engine in a protective "cage" in front of a propeller. The fixed conventional undercarriage had double mainwheels under each engine and a tailskid under the extreme tail of each boom. A substantial double nosewheel prevented damaging and dangerous noseovers.
Armament consisted of two to four Revelli 6.5 mm or 7.7 mm machine guns, one in a front ring mount and one, two or sometimes even three in an upper ring mount. Bombs were suspended under the hull.
Operational history
The Ca.1 entered service with the Italian Army in the middle of 1915 and first saw action on 20 August, attacking the Austrian air base at Aisovizza. Fifteen bomber squadrons (1°–15° Squadriglia) were eventually equipped with Ca.1, Ca.2 and Ca.3 bombers, mostly bombing targets in Austro-Hungary. The 12° Squadriglie operated in Libya. In 1918, the 3°, 14° and 15° Squadriglia operated in France.
Apart from the Italian Army, original and licence-built examples were used by France (original Capronis were used in French CAP escadres, licence-built examples in CEP escadres). They were also used by the American Expeditionary Force. There has been some confusion regarding the use of the Ca3 by the British Royal Naval Air Service. The RNAS received six of the larger triplane Ca4s and did not operate the Ca3. The British Ca4s were not used operationally and were returned to Italy after the war. Some of the Ca.36Ms supplied after the war were still in service long enough to see action in Benito Mussolini's first assaults on North Africa.
This plane is also remembered for a tragedy on May 4, 1919, which killed the French General Dr. Milan Rastislav Stefanik, who was the minister of war in the Czechoslovak Republic at the time. The accident occurred at the conclusion of a flight from Campoformido near Udine to Bratislava (capital of Slovakia). On his initial approach, the pilot determined that the ground was too wet to land on, so he increased power to the engines and began to aim the plane to a landing patch further afield which appeared to be dry. While doing so, one of the engines exploded, causing the aircraft to nosedive. General Stefanik and the three Italian crew members were pronounced dead at the scene. A subsequent investigation determined that the most likely cause of engine failure was a failure of the airblast cooling of the engine, probably induced by the increased strain cause by the pilot's sudden demands on the engine after the aborted landing. There were allegations that a Czech anti-aircraft artillery company had fired on the aircraft, either because they mistook the Italian for Hungarian markings or that they had done so as part of a conspiracy to see Gen. Stefanik killed, to prevent him from instigating proposed changes in the Czech government. These allegations were never proven and the failure of the engine's blast cooling is widely accepted as the best explanation for the accident.
Variants
All of the following names were applied after the war. At the time, all were known as the 300 hp by Caproni and the Ca.3 by the Army.
Operators
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