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Polikarpov R-5 / SSS / P-5
Kochierigin R-5

 

poli-r5


An unequal-span two-seat biplane constructed largely of wood with fabric covering, the R-5 reconnaissance light bomber flew in prototype form in 1928. Pilot and observer/gunner were seated close together in tandem open cockpits - the pilot beneath a cutout in the upper wing trailing-edge. The BMW VIb in-line engine of the prototype was replaced by the 507kW Soviet-built M-17B in production aircraft. The R-5 could operate on skis or twin-floats (the latter designated R-5A or MR-5), as well as on the more normal axle-type fixed undercarriage. Standard armament was a fixed 7.62mm PV-1 machine-gun and a DA-1 weapon of the same calibre operated by the observer. Up to 250kg of bombs could be carried on underwing racks.

Many variants of the R-5 were used in the Soviet Union. These included the single-seat R-5T torpedo bomber; the heavily armed R-5Sh ground-attack aircraft; and the SSS of 1934 with 533kW M-17F engine, spatted landing gear and new ShKAS machine-guns. Civil versions were the P-5 and P-5A, the latter with cabin accommodation for four passengers, and an enclosed pilot's cockpit.

Some 7,000 of all versions of the R-5 were built. Military operations included the Spanish Civil War (31 R-5s serving with the Republicans), the campaigns in 1938-39 against the Japanese in the Far East, the 'Winter War' against Finland, and the fighting against Germany from 1941. At the time of the German invasion most R-5s had been relegated to training and liaison duties, but several hundred returned to first-line duties to equip light night-bombing 'nuisance raid' units alongside the Polikarpov U-2.

As early as 1930, the possibility of equipping the R-5 with a wing equipped with leading edge flaps and slats was considered. It was appreciated that an aircraft with this wing configuration would be much safer to perform the role of a night bomber.
 
 Koch-R5-01
R-5 # 4681 with leading edge slats and top plane flap
 
Originally the development of this variant was assigned to the TsKB-39 and later transferred to the TsKB. The modifications were made by a group under the leadership of LI Sutigun in S A. Kochierigin's brigade.
 
The upper wing received straight ends, trailing edge flaps following the ailerons, and slats on the wing leading edge. Two examples were modified in 1933 as Polikarpov R-5 with sectioned wing (Russian: Поликарпов Р-5 с разрезным крылом). The first, with serial number No.4681 was called Sectioned Wing - 1 and the second with number No.5563 Sectioned Wing - 2.
 
 Koch-R5-02
R-5 No.4681
 
During the tests it was possible to reduce the landing speed to 70 km / h. The ceiling increased and the maximum speed decreased slightly.
 
Despite the results obtained, the series production of the model was not approved as it was considered that the take-off and landing characteristics of the R-5 were not bad and the wing mechanization complicated the production process.
 
 Koch-R5-03
R-5 No.4681 on February 9, 1933 with slightly low flaps.
 
In 1933 R-5 No.4681 was used to test the VAP containers for chemical weapons developed by engineer Vaxmistrov.

 

Engine: 1 x M-17, 370kW
Max take-off weight: 3351 kg / 7388 lb
Empty weight: 2108 kg / 4647 lb
Wingspan: 15.5-12.0 m / 51 ft 10 in - 39 ft 4 in
Length: 10.6 m / 35 ft 9 in
Height: 3.6 m / 12 ft 10 in
Wing area: 50.2 sq.m / 540.35 sq ft
Max. speed: 230 km/h / 143 mph
Ceiling: 6150 m / 20200 ft
Range w/max.fuel: 600 km / 373 miles
Armament: 3 machine-guns, 250kg of bombs
Crew: 2

Kochierigin R-5
Engine: 1 M-17B 500/680 hp
Wingspan upper: 15.50 m
Wingspan lower: 12.0 m
Length: 10.65 m
Wing area: 50.84 m²
Empty weight: 2085 kg
Normal takeoff weight: 2985 kg
Wing loading: 58.7 kg / m²
Power load: 5.9kg / hp
Fuel weight: 427 kg
Total load capacity: 900 kg
Maximum speed at sea level: 205 km / h
Maximum speed at 3000 m: 189 km / h
Landing speed: 70 km / h
Practical range: 800 km
Endurance: 4.5h
Climb to 1000 m: 7.5 min
Climb to 2000 m: 15.0 min
Practical ceiling: 5140 m
Landing run: 120 m
Seats: 2
Armament: A 7.62mm PV-1 synchronized machine gun/ 2 x 7.62mm DA machine guns in rear cockpit.

 

poli-r5-ld

Polikarpov R-5

 

 


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