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Light Reconnaissance Bomber


Caudron C.670

C.670 - Light reconnaissance bomber. The first prototype C.670-01 left the workshops of the Billancourt plant in March 1937 and made its first flight in Guyancourt within a month and then made four or five flights in the following days.

C.670 structurally was a twin-engine low-wing cantilever with a cockpit shifted far back and low engine power of the power plant.

The low-lying trapezoidal wing had an all-wood structure. The wing skin was working and was made from five-ply plywood. The thickness of the wing skin gradually decreased from the roots and tips. Ailerons were covered with linen.

The aircraft fuselage essentially consisted of two vertical halves. The fuselage could be divided into four parts along its length. In the front of the first part there was a bombardier's post, behind it was a bomb bay, the doors of which opened under the influence of gravity. Behind the bomb bay in the central part of the fuselage was a large double glazed cockpit, in which the pilot and gunner were in tandem seats. Behind the cockpit was the conical tail section of the fuselage.

The horizontal stabilizer was located at the top of the fuselage. The angle of attack of the stabilizer was adjusted from the cockpit using a worm gear. The elevators and rudders had a wooden power set and linen sheathing.

The power plant consisted of two six-cylinder inverted in-line Renault 454 engines, which at an altitude of 4000 meters developed a rated power of 220 hp and rotated two-blade metal Ratier propellers with an electric pitch change mechanism.

In the rear of the engine nacelles, welded from steel pipes, the main landing gear was located between the two wing spars. Each of the struts consisted of a wheel and two Messier oil / air shock absorbers. The racks were removed and released using a hydraulic drive. The tail wheel was also retractable.

C.670 Specifications
Crew 3
Wing span, m 14.80
Wing area, m² 28.00
Length, m 11.60
Height, m 3.00
2 × PE Renault 454, power, hp 2 × 220
Weight, kg:
Empty plane 2,147
Gross weight 3,704
Maximum speed, km/h 405
Cruising speed, km/h 382
Service range, km 900
Service ceiling, m 9,100
2 × 20 mm HS9 cannon, 1 × 7.5 mm MAC-34 machine gun, bombs up to, kg 500

The crew consisted of a bombardier, pilot and gunner. The pilot of the aircraft, performing the duties of the crew commander, occupied the front of the two-seat cockpit, which was shifted far back and which had a good view forward and upward. Protection of the rear hemisphere was assigned to the gunner behind the pilot. The shooter's seat was swivel with locking in the front and rear positions. When the seat was fixed with the position of the shooter facing forward, he could perform the functions of the co-pilot and radio operator; when fixed in the rear position, the shooter could fire from a machine gun.

The first crew member was placed in the forward fuselage, separate from the rest; the front compartment was accessed through a sliding door, and in flight the bombardier could easily move in the compartment. Side view in the bombardier's cockpit was provided by two cellon windows located on both sides of the fuselage. Aiming was carried out using a removable hatch and a bomber sight located at the level of the cabin floor. During reconnaissance flights, the bombardier compartment was equipped with a camera.

Armament of the aircraft consisted of two 20mm HS9 cannons mounted in front of the fuselage. Each of the cannons had a charger for 60 shells, in addition, the guns could be equipped with magazines for 30 shells, placed on special racks near the place of the bombardier, responsible for reloading the guns and firing. The pilot opened fire with a pneumatic actuator mounted on the control stick;

7.5-mm machine gun MAC-34, mounted in the rear of the two-seat cockpit and placed on a special adjustable support with mechanical correction during firing. Folding panels made it possible to shoot downward, significantly increasing the sector of fire; however, given the speeds developed by the aircraft, the effectiveness of this solution was questionable). In the stowed position, the machine gun was moved to the rear of the cockpit and rigidly fixed by a simple blocking of the support and then covered with a fairing. The supports were attached to the floor of the fuselage, where there were eight magazines with one hundred rounds in each.

Bomb load - two 100-kg bombs for striking deep in enemy defenses or two 250-kg bombs for striking close targets.

Photo Description

Drawing C.670


  • Experienced light multipurpose combat aircraft Caudron-Renault C.670 / Ivan Byakin /
  • The Complete Encyclopedia of World Aviation: Aircraft and Helicopters of the 20th Century / Donald D. /