Performance
The aircraft was underpowered, with a maximum speed of 363 km/h (226 mph) at 4,500 m (14,800 ft) and a high minimum speed of 130 km/h (81 mph), (there were no slats, and maybe not even flaps). Ceiling was only 6,000 m (20,000 ft) and the endurance, at 70% of throttle, was 1,600 km (990 mi). All-up weight was too high, with total of 8,725 kg (19,240 lb), not 7,375 kg (16,260 lb) as expected.
The total payload of 2,800 kg (6,200 lb) was shared between the crew (320+ kg/705+ lb), weapons (200 kg/441 lb), radios and other equipment (100 kg/220 lb), fuel (2,200 L/581 US gal), oil (1,500 kg/3,307 lb), oxygen and bombs. There was almost no chance of carrying a full load of fuel with the maximum bombload, (other Italian bombers were generally capable of a 3,300-3,600 kg/7,275-7,937 lb payload). The lack of power made take-offs when over-loaded, impossible. Indeed, even with a normal load, take-offs were problematic .
Take-off and landing distances were 418 m (1,371 ft) and 430 m (1,410 ft). The range was good enough to assure 2,200 km (1,400 mi) with 550 kg (1,210 lb) and 1,200 km (750 mi) with 1,200 kg (2,650 lb).
The production version was fitted with two inline liquid-cooled Asso XI RC.40 engines, each giving 671 kW (900 hp) at 4,000 m (13,120 ft). Aerodynamic drag was reduced, with three-bladed metal propellers that were theoretically more efficient. These new engines gave the aircraft a maximum speed of 400 km/h (250 mph) at 4,000 m (13,120 ft). It could climb to 2,000 m (6,560 ft) in 5.5 minutes, 4,000 m (13,120 ft) in 12.1 minutes and 5,000 m (16,400 ft) in 16.9 minutes.
Despite this, the aircraft was still underpowered, so the 1939 Ca.135Mod, fitted with 746 kW (1,000 hp) Piaggio P.XI engines, was developed.
Read more about this topic: Caproni Ca.135
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