Caproni Ca.165
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| Caproni Ca.165 | |
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 Artist's representation of the Ca.165 |
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| Type | Fighter |
| Manufacturer | Caproni |
| Maiden flight | February 1938 |
| Status | prototype |
| Primary user | Regia Aeronautica |
| Number built | 1 |
The Caproni Ca-165 was an Italian fighter aircraft developed just before the Second World War, but only produced as a prototype. Even if known for three engine heavy bombers, Caproni had a long history with fighters, started in 1914 with an interceptor with a single machine-gun and monoplane. This was innovative for its time, but it had also no success, as almost all the fighters proposed in the next decades.
Many types of machines were developed by Italian industries prior to World War II, and some were produced at least in limited numbers, but this would not be the case with the Caproni Ca.165, a biplane fighter proposed for a fighter contest. In February 1938 it flew for the first time as prototype.
[edit] Design
The Ca.165 had a mixed construction. The fuselage was framed in steel with a skin of light alloys, while the wing was built out of wood with fabric skin. Finally, the tail was metallic, also covered in fabric.
The Caproni Ca.165 had a slim and low fuselage compared to the Fiat CR.42, and an enclosed cockpit, somewhat resembling contemporary monoplane aircraft (or, as more relative comparation, Avia B.534 biplane fighter). The undercarriage was fixed, and the wheels had aerodynamic curvatures. A unique feature of the Ca.165 was the retractable radiator, which the pilot could deploy for optimum performance, or retract inside the fuselage, depending on the flight conditions: completely open in climbs, or closed in level flight and dives. In this way, it was similar to the Morane-Saulnier M.S.406. When deployed, the radiator significantly increased the drag on the aircraft, but increased engine performance and reliability.
The engine was a 12-cylinder Isotta Fraschini L121 RC.40 with 900 hp nominal power, turning a three-bladed Alfa Romeo electric propeller. Top speed was around 465 km/h at 5,350 m with a 10,000 m ceiling. The range was relatively small, around 672 km. Dimensions were 8.1 m length, 9.3 m, height 2.8 m, wingspan, 21.4 m² wing surface. The weight was 1,855/2,435 kg, with 570 kg of payload.
After several modifications, the Ca.165 had the tail surface augmented and the aft fuselage lowered to have a canopy with 360° visibility.
[edit] Ca.165 v. CR.42
At Guidonia the aircraft was tested like the many other fighters present for evaluation. However, it was only tested against the Fiat CR.42 Falco, the only other biplane. In mock-up fights the Ca.165 outperformed the CR.42, thanks to the superior aerodynamics and available power. Despite this, the aircraft was rated inferior because there were other factors to consider: the CR.42 was slower, because it had a radial engine and thus more drag, but it had more efficient flight controls and was more manoeuverable. On top of this, the Caproni engine was experimental and had poor reliability. However, the Ca.165 was the 'winner' of the mock fights, so General Valle ordered 12 examples on 2 September 1939, but the order was cancelled on 11 October 1939 and changed to 12 F.5s. This production shift was made even though it involved the payment of a penalty.
The Caproni Ca.165 was comparable in useful load (570 kg vs. 575 kg) and weapons (2x12 mm, 1x7 mm.) to the CR.42, but it was 200 kg heavier with less wing surface, so it had wing loading of 113 kg/m compared to 99 for the CR.42; and that, coupled with the less effective controls made the Ca.165 less agile. Despite these shortcomings, the Ca. 165's minimum speed was lower (114 vs 122 km/h), allowing for shorter takeoff runs and slightly better low-speed performance.
The Ca.165 had a very slim and small fuselage, but was heavier than the CR.42, which was due, arguably, to the different engine and construction. The Caproni was not really a 'turning fighter', but given the limits of biplanes, was more of an 'energy fighter' with more pronounced capabilities in speed than turning (as was emphasized by the test pilots). The improved version would have been even better, but the development was interrupted. It was built with non-strategic materials (steel and wood mainly), so it could have been an advantage in the war in terms of strain on the materials industry, but given the type of engine, it is unclear if it was an economically practical aircraft.
Caproni tried other ways to improve this powerful biplane, first with the P.XI 1000 hp radial engine (the same as the Reggiane Re.2000), then with Isotta Fraschini L.170 1000 hp liquid cooled powerplant, and the redesigned Ca.173 (with sesquiplane wing). None of these proposals were successful, at least not enough to pique the interest of the Regia Aeronautica. In any case, both engines were far from being sufficiently reliable and were never adopted in large numbers by the Italian air force.
[edit] Loss of production bid
Perhaps the influence of Fiat contributed to the selection of the CR.42 Falco over the Ca.165, although Caproni was an influential company itself at the time. Apparently the bottom line was that the Caproni's engine was much less reliable and only 60 hp more powerful, while the aircraft itself was 200 kg heavier.
The Caproni Ca.165, despite being considered the winner in the mock-up fights, lost the final evaluation. Apparently, test pilots flying the Ca.165 managed to outperform the Falco but disliked the aircraft itself. The faster speed was a more modern concept for a new generation fighter (especially in the interception of fast bombers such as the Bristol Blenheim, which often proved too fast for the Falco), and speed was an increasingly important design consideration in World War II-era aircraft. The engine's poor reliability was also apparent, and when considering which aircraft to produce, this could have been a disadvantage as well.
In any case, the Caproni Ca.165 was produced in only a single prototype and so vanished from history; instead the Fiat CR.42 became the most produced Italian fighter, despite its overall obsolescence, with almost 1,800 examples built until 1944.
[edit] Specifications (Ca.165)
General characteristics
- Crew: One, pilot
- Payload: 570 kg (1,255 lb)
- Length: 8.1 m (26 ft 7 in)
- Wingspan: 9.3 m (30 ft 6 in)
- Height: 2.8m (9 ft 2 in)
- Wing area: 21.4 m² (230.25 ft²)
- Empty weight: 1,855 kg (4,080 lb)
- Max takeoff weight: 2,435 kg (5,357 lb)
- Powerplant: 1× Isotta Fraschini L121 RC.40 12-cylinder inline engine, 671 kW (900 hp)
Performance
- Maximum speed: 465 km/h (251 knots, 289 mph) at 5,350 m
- Stall speed: 114 km/h (61 knots, 71 mph)
- Range: 672 km (363 nm, 417 mi)
- Service ceiling 10,000 m (32,800 ft)
- Wing loading: 113 kg/m² (23.11 lb/ft²)
Armament
- 2 × 12.7 mm machine guns
[edit] References
- Lembo, Daniele I brutti anatroccoli della Regia, Aerei nella Storia, Westward editions, n.14. (Italian)
[edit] External links
[edit] See also
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