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POTEZ 637

 


Technical Specifications
Type
Bimoteur Twin-engine Tree-seater of Reconnaissance (A3) with low-wings and retractable landing gear.
Date first flight
October 1938
Wingspan
16,00 m 
Lenght
11,07 m 
Height
3,61m 
Wing Area
32,70 m2 
Empty Weight
2450 Kg 
Max. Takeoff Weight
4225 Kg 
Cruising Speed
km/h. 
Maximum Speed
435 km/h at 5500m 
Climbing Speed
4000m in 6mn 12s 
Service ceilling
8500 m 
Range
1500kms
Crew
3 Men
Motorization
2 Radial engine Gnôme & Rhône 14 cyl 14M 6/7 of 700ch
Armament
1 fixed machine-gun MAC 34 of 7.5mm forwards
1 mobile machine-gun MAC 34 of 7.5mm rearwards
1 fixed machine-gun MAC 34 of 7.5mm fixe rearwards

 


Production

60 Potez 637 A3 were built after the prototype that made its first flight on October 1938 .

To date, out of the 60 aircraft manufactured,31 are listed in the list below :

 


Historical

The Potez 630 is the result of a program of 1934 aimed at equipping the Air Force with a multi-seater light aircraft capable of fulfilling missions of Hunting Command, Tandem of escort and Two-seater fighter of Night. The Potez 630 competes with the Breguet 690, Romano 110, Loire-Nieuport 20, Hanriot 220.

The Potez 630's study deadlines are rather short: the first prototype was manufactured in April 1935 and was completed in early 1936 with a first flight on April 25, 1936, to the hands of the Nicolle test pilots. The prototype is powered by two Hispano-Suiza 14Hbs of 580ch. The aircraft is well-born, and shows good flying qualities. Beginning August 1936, it was transferred to Villacoublay to undergo some modifications. The wooden bi-drift is replaced by a metallic model, and it receives a new landing gear. The manufacturer's tests end at the end of November 1936, and the CEMA (Aircraft Testing Center) will accept the aircraft at the end of December. The official test campaign can begin. The original engine is replaced by Hispano-Suiza 14ab 02/03, then by HS14 Ab 10/11. After acceptance of the aircraft by the Air Force, a dozen units are requested from Potez for various experiments: 4 Potez 630, 3 Potez 631, 2 Potez 633 B2 and 1 Potez 637A3.

The Potez 637 A3 is a reconnaissance three-seater that made its first flight in the summer of 1938. The same design as the Potez 631, which takes over the cell and the engine, it is equipped with a ventral observation post in an added glazed gondola under the fuselage. This will prove very vulnerable to the shooting of DCA. It has a longer range thanks to larger tanks and and possess cameras behind the aircraft. His armament, two 7.5mm machine guns, is identical to Potez 633, later completed by a third machine gun at the back of the ventral gondola.

60 aircraft were ordered in August 1938 by the Air Force even before the first flight took place (October 1938). The Potez 637 which will be distributed in the GR (Reconnaissance Group) will replace the Potez 542, now outdated. They will serve as transition planes pending the arrival of the Potez 63-11
At the outbreak of hostilities, only those Potez 637 will have the right to fly over enemy territory: other types of aircraft in the GRs, such as Bloch 131, Potez 542 or even Potez 25 are far too vulnerable as will be shown in the first losses.

As of November 1939, the Potez 637 were gradually replaced by the Potez 63.11 and at the outbreak of the German attack, on May 10, 1940, there was virtually no Potez 637 in unity.

 


Versions

The Potez 637 was only produced in one version


Bibliography

1) _ Editions LELA PRESSE ; Collection "Les Ailes de la Gloire"
- N°9 : Les Potez 63

 

2) _ Editions MMP ; Collection "Orange Séries"
- N°8109 : Potez 63 Famil
y

 

 

 


Photos Album

 


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