Yakushev-Borzov YakB-12.7mm machine gun
The Yakushev-Borzov YakB-12.7 mm is a remotely controlled 12.7×108mm caliber four-barrel rotary cannon developed by the Soviet Union in 1973 for the Mil Mi-24 attack gunship and low-capacity troop transporter, with 1470 rounds, which can also be mounted in GUV-8700 machine-gun pods with 750 rounds. It has a high rate of fire (4–5,000 rounds per minute) and is also one of the few self-powered guns of the Gatling type (i.e. it is gas-operated, rather than requiring an external motor to operate).
|Yak-B machine gun|
Yakushev-Borzov YakB-12.7 machine gun in the Prague Aviation Museum)
|Type||Aircraft rotary cannon|
|Place of origin||Soviet Union|
|Manufacturer||KBP Instrument Design Bureau|
|Mass||45 kg (99 lbs), cartridge weight 0.130 kg, bullet weight 0.048 kg|
|Length||4.57 m (10 ft)|
|Width||2.88 m (9 ft 5 in)|
|Rate of fire||4000–5000 rounds/min|
|Muzzle velocity||810 m/s (2,657 ft/s)|
On the Mi-24 it is mounted in the VSPU-24 undernose turret, with an azimuth of 60° to either side, an elevation of 20°, and a depression of 60°. The gun is slaved to the KPS-53AV undernose sighting system with a reflector sight in the front cockpit.
It was replaced by the fixed, side-mounted GSh-30K or the swivel-mounted GSh-23L in the late mark of the Mi-24 helicopters, as it did not provide enough firepower against dug-in or lightly armored targets that did not necessitate a rocket attack but it's still used on Mil Mi-24, Mil Mi-36 and Mil Mi-40 helicopters.
- Koll, Christian (2009). Soviet Cannon: A Comprehensive Study of Soviet Arms and Ammunition in Calibres 12.7mm to 57mm. Austria: Koll. p. 64. ISBN 978-3-200-01445-9.