avia.wikisort.org - Helicopter

The Bratukhin B-5 was a prototype Soviet twin-rotor transport helicopter designed by the Bratukhin aircraft design bureau.[1]

Bratukhin B-5
Role	Transport helicopter Type of aircraft
National origin	Soviet Union
Manufacturer	Bratukhin
First flight	1947
Number built	1 (B-5) 1 (B-9) 1 (B-10)
Variants	Bratukhin B-11

Development

The B-5 was an improved and larger design based on the bureau's earlier G-4, a twin-rotor helicopter, with each rotor driven by an Ivchenko AI-26 radial engine.[1] Each engine was housed in a pod on an outrigger with the related rotor above.[1] The programme was delayed waiting for appropriate engines and the B-5 was not completed until 1947, it only made a few short hops before the programme was abandoned due to vibration and structural flexing.[1][2]

An air ambulance variant, the Bratukhin B-9 was built but was abandoned without being flown.[2][3] Another variant was the Bratukhin B-10 which had uprated 575 hp (429 kW) engines and was modified for use in the artillery observation role with the military designation VNP (Vosdushnii Nabludatelnii Punk - Aerial Observation Point).[2] The B-10 had three-seat for the crew, the cabin could hold three passengers or equipment. The B-10 flew in 1947 but although it did not have the wing stiffness problems of the B-54, demonstrating adequate handling like the B-5 and B-9 was also abandoned.[2][3] A variant with an improved performance was built as the Bratukhin B-11.[2]

Variants

B-5

Prototype, one built.

B-9

Prototype air ambulance variant, one built.

B-10

Prototype observation and reconnaissance variant, one built.

Specifications (B-10)

Data from [4]

General characteristics

• Crew: 3
• Capacity: 3 or additional equipment
• Empty weight: 3,019 kg (6,656 lb)
• Max takeoff weight: 3,900 kg (8,598 lb)
• Powerplant: 2 × Ivchenko AI-26GVF) radial piston engine, 429 kW (575 hp) each
• Main rotor diameter: 2 × 10.00 m (32 ft 10 in)

Performance

• Maximum speed: 218 km/h (135 mph, 118 kn)
• Range: 440 km (270 mi, 240 nmi)

See also

Related development

• Bratukhin G-4
• Bratukhin B-11

Related lists

• List of rotorcraft

References

Notes

Bibliography

На других языках

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- [en] Bratukhin B-5

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[fr] Bratoukhine B-5

Le Bratoukhine B-5 était un prototype d’hélicoptère de transport soviétique à deux rotors conçu par le bureau d'études de Bratoukhine[1],[2].

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