Yakovlev Yak-24

infobox Aircraft
name = Yak-24
type = Transport helicopter
manufacturer = Yakovlev



caption =
designer =
first flight = 3 July 1952
introduced = 1955
retired =
produced =
number built = 40-100
status = Retired
unit cost =
primary user = Soviet Air Force
more users = Aeroflot
developed from =
variants with their own articles =

The Yakovlev Yak-24 (NATO reporting name "Horse") was a twin engine, tandem rotor transport helicopter developed in the USSR.

History

The Yak-24 was designed in the construction bureau of Alexander Sergeyevich Yakovlev, not specializing in helicopters so far, to meet a demand for a heavy transport helicopter to supplement the medium Mil Mi-4. The first prototype was flown on 3 July, 1952. It was powered with two 1,700 hp Shvetsov ASh-82V radial engines and was built in a tandem rotor layout, not typical for Soviet helicopters, which soon brought it nick-name "Letayushchiy Vagon" (Летающий вагон) - 'the Flying Railroad Car'. The engines and transmission system were the same, as already proven in the single-engine Mi-4, but the Yak-24 appeared not as successful design. Its engines were linked together so each could drive one or both rotors, but such arrangement caused strong vibrations. After problems were partially solved, the new helicopter was order for production, which started in 1955. In July 1955 it was first presented to the public, and on 17 December 1955 it set two new world payload records, lifting a 2,000 kg load to 5,082 m and 4,000 kg to 2,902 m. Initial variant was the Yak-24 - Army transport helicopter, that could carry up to 30 airborne troops, 18 stretchers or 3,000 kg of cargo. From 1958, the improved model Yak-24U was produced, with all-metal rotors of bigger diameter (21 m) and all-metal fuselage. It could carry 40 soldiers or 3,500 kg of cargo, including 2 GAZ-69 jeeps or anti-tank guns. A civilian variant for 30 passengers was the Yak-24A, produced from 1960 in a small series. It was also used as a flying crane, lifting an external load of 5,000 kg. There were two proposed models: the Yak-24K 9-seat VIP salon with shorter fuselage and civilian Yak-24P for 39 passengers with stronger 2,700 hp turboshaft engines, but they were not built.

Exact number of produced Yak-24 helicopters is not sure, but due to technical problems, the series was very small. The need for a heavy transport helicopter was satisfied with the successful Mil Mi-6 by then. Most often a number of about 100 produced Yak-24 helicopters is given, some sources state about 40. According to some sources, the passenger Yak-24A was not actually produced.

Operators

;USSR
*Aeroflot
*Soviet Air Force

pecifications (Yak-24)

aircraft specifications

plane or copter?=copter
jet or prop?=prop
crew=three
capacity=30 soldiers, 18 stretchers, or 3,000 kg (6,600 lb) of cargo
length main=21.34 m
length alt=70 ft 0 in
span main= 2x 20.20 m
span alt= 66 ft 3 in
height main= m
height alt= ft
area main= 640.9 m²
area alt= 6,899 ft²
empty weight main=10,607 kg
empty weight alt=23,384 lb
loaded weight main=
loaded weight alt=
max takeoff weight main=14,270 kg
max takeoff weight alt=31,460 lb
engine (prop)=Shvetsov ASh-82V radials
type of prop=
number of props=2
power main=1,268 kW
power alt=1,700 hp each

max speed main=195 km/h
max speed alt=122 mph
range main=430 km
range alt=268 miles
ceiling main=5,000 m
ceiling alt=16,400 ft
climb rate main= m/s
climb rate alt= ft/min
loading main= kg/m²
loading alt= lb/ft²
power/mass main= kW/kg
power/mass alt= hp/lb

ee also

aircontent
related=

similar aircraft=
* Piasecki H-21
* Piasecki PV-17
* Bristol Belvedere
* CH-46 Sea Knight
* CH-47 Chinook

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lists=

see also=