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Yakovlev Yak-42M/46/242

Triton

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Yakovlev Yak-242

Type: Twin turbo-shaft short-range airliner.

Program: Superseded three-engined Yak-42M.

Customers: Aeroflot requirement for 200 aircraft in this category.

Design features:
Much more than a stretched Yak-42; only fuselage cross-section is not new; wings have supercritical section devised in collaboration with TsAGI with 256 degree sweepback, increased span and higher aspect ratio; double-slotted trailing edge flaps, and winglets; together with new turbofans, this gives increased performance; digital fly-by-wire flight controls and five-CRT EFIS standard; avionics upgraded fo ICAO Cat. IIa minima.

Flying controls: Fly-by-wire.

Landing gear: Hydraulically retractable tricycle type; four wheel bogie main units; twin-nosewheels.

Power plant: Two Aviadvigatel PS-90A turbofans; each 118 kN (26,525 lb st).

Accommodation: Crew of two side by side on flight deck; provision for flight engineer if required; 130 to 180 passengers; (1) single class cabin configuration for 180 passengers at 75 cm (29.5 in) pitch, 162 at 78 cm (30.7 in) pitch, or 156 at 81 cm (31.9 in) pitch, all six-abreast with center aisle; (2) 12 four-abreast in first class cabin at front at 96 cm (37.8 in) pitch and 126 at 78 cm (30.7 in) pitch; or (3) 12 first class, 24 business class at 87 cm (34.25 in) pitch and 96 at 78 cm (30.7 in) pitch. Doors at front and rear of the cabin, with service doors opposite; two emergency exits each side, over wing.

Avionics: Bendix/King flat-panel flight deck displays.

Dimensions external
Wing span: 36.25 m (118 ft 11.25 in)
Length overall: 38.00 m (124 ft 8 in)

Areas
Wings, gross: 120.0 sq m (1,292 sq ft)

Weights and loadings
Operating weight, equipped: 38,400 kg (84,655 lb)
Normal fuel: 14,000 kg (30,865 lb)
Max fuel: 22,000 kg (48,500 lb)
Max payload: 18,000 kg (39,680 lb)
Max T-O weight: 64,600 kg (141,415 lb)

Performance (estimated)
Nominal cruising speed at 11,100-11,600 m (36,400-38,050 ft) 431-458 kts (800-850 km/h; 497-528 mph)
Required runway length: 2,200m (7,220 ft)
Range, CAR reserves with max payload: 863 n miles (1,600 km; 994 miles)
Range, CAR reserves with normal payload: 1,427 n miles (2,700 km; 1,677 miles)
Range, CAR reserves with max fuel: 2,700 n miles (5,000 km; 3,107 miles)

Source: Jackson, Paul ed. Jane's All the World's Aircraft 1995-96 Jane's Information Group Ltd 1995 p. 402.
 

Triton

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Mock-up of Yakovlev Yak-242 cockpit circa 1993.

Source: http://www.flightglobal.com/pdfarchive/view/1993/1993%20-%201658.html
 

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Trident

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Triton said:
Yakovlev Yak-242
...
Power plant: Two Aviadvigatel PS-90A turbofans; each 118 kN (26,525 lb st).

Sounds like the PS-90A12 model, to be exact:

http://www.uvauga-dvig.narod.ru/ps90a-12.pdf

Note also that this spec sheet mentions the Yak-46 as an application.
 

Triton

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Inboard profile and cabin configuration of Yakovlev Yak-46 propfan circa 1990.

Three-view drawing of Yakovlev Yak-46 circa 1990.

Source: http://www.flightglobal.com/pdfarchive/view/1990/1990%20-%201351.html
 

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ucon

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Hi all!
My five cents in this subject.
Some of countless Yak-42 projects and variants.
 

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ucon

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Early Yak-42 projects and Yak-46
 

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ucon

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Yak-42M Russia
HR on demand
 

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Stargazer2006

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Hey ucon, you're posting some GREAT stuff on this forum!

I have one request though: Russian letters do not translate well in filenames. In their place, all we can see on the screen is a series of question marks such as "??-42? ?? ?? ?? 02 0.jpg".

Is it possible for you to provide a readable equivalent to these files' names in Western type? Thanks in advance!
 

ucon

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Oh! Sorry, friends! Something went wrong.
So, first five pix
1. Very first project with Yak-42 designation. Early 1970
2. Next two pix are Yak-42LL (test-bed) for D-27 engine
3. Next two pix are Yak-42F for radiation probe

Second five pix
1.Yak-42-71 project
2. Yak-42-72 project
3. Yak-42 a-la Falcon project
4. Yak-42 twin-engine project
5. Yak-46 model

And last two pix
Yak-42M Russia model
Yak-42M Russia cutaway drawing

Sorry once again
 

Grey Havoc

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Looks like the United Aircraft Corporation might yet get the opportunity to revive the Yak-242 and Yak-46 programs, although it's Beriev component in particular may have other ideas. From the Christian Science Monitor, via msnbc.com.
 

Triton

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Grey Havoc said:
Looks like the United Aircraft Corporation might yet get the opportunity to revive the Yak-242 and Yak-46 programs, although it's Beriev component in particular may have other ideas. From the Christian Science Monitor, via msnbc.com.

Why would United Aircraft Corporation revive the Yak-42M/46/242 projects when it has orders for the MS-21 program?
http://www.secretprojects.co.uk/forum/index.php/topic,8742.msg78005/topicseen.html#msg78005
 

Grey Havoc

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I'd forgotten about the MS-21. However I do think the Yak-46 is well placed for a possible revival due to the renewed interest in propfans.
 

Flying Sorcerer

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I wasn't aware of the Yak 46M trimotor; does anyone know when it dates from and what engines it would've been equipped with?
 

hesham

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From Kryl'ya Rodine 10/1987,

I think it was a Yak-46 Project,right ?.
 

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Cy-27

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Some notes from Janes AWA copied down in 1994 on two of the Yak-46 variants.

Yakovlev Yak-46-1 (1st variant - Turbofan)

Twin Turbofan Short-Medium Range Passenger Transport

The design study for the Yak-46-1 started in early 1991 and was included in the State Air Transport program up to the year 2000. It was adopted by the Russian Transport Minister on 22nd May 1992.

Four project versions were envisaged, single class with 168 seats, mixed classes of 12 first class and 114 tourist class, convertible passenger/freighter and casualty evacuation.

It was a conventional low wing monoplane with under-wing engines and super critical high aspect ratio wings with a sweepback of 25 degrees. It had winglets and a swept tail. The tail plane was located on the tail cone.

The Yak-46-1 had fly by wire flying controls. It was fitted with hydraulically retractable tricycle type undercarriage with a four wheel main bogie unit and a twin nose-wheel. Doors were located at the front and rear of the cabin on the port side. On the starboard side were service doors. There were two over-wing emergency exits. The aeroplane featured integrated flight and navigation communications for operation in category IIIA conditions.


ENGINES: 2 x Samara SSPE Trud High Bypass Turbofans (107.9 kN each)
WING SPAN: 36.25 m
LENGTH: 38.80 m
WING AREA: 120 sq m
OPERATING EMPTY WEIGHT: 34,840 kg
MAXIMUM TAKE OFF WEIGHT: 60,200 kg
MAXIMUM PAYLOAD: 17,500 kg
ACCOMODATION: 2 crew + 126-168 passengers
CRUISING SPEED: 850 km/h
RANGE: 2,200 km with maximum payload or 3,450 km with normal payload
SERVICE CEILING: 11,100 m
BALANCED RUNWAY LENGTH: 2,100 m
MAXIMUM WING LOADING: 501.7 kg sq m
MAXIMUM POWER LOADING: 278.7 kg/kN

Yakovlev Yak-46-2 (2nd variant - Pusher Propfan)

Twin Propfan Short-Medium Range Passenger Transport

The design study for the Yak-46-2 started in 1990 and was included display in model form at MosAero Show 1990. Development was dependent on the development of the propfan engines. It was entirely different from the Yak-46-1 except it had the same fuselage and accommodation. The wings were further to the rear and featured a new tail unit. It had two side mounted pusher engines.

Four project versions were envisaged, single class with 168 seats, mixed classes of 12 first class and 114 tourist class, convertible passenger/freighter and casualty evacuation.

The Yak-46-2 had fly by wire flying controls. It was fitted with hydraulically retractable tricycle type undercarriage with a four wheel units and a twin nose wheel. Doors were located at the front and rear of the cabin on the port side. On the starboard side were service doors. There were two over-wing emergency exits. The aeroplane featured integrated flight and navigation communications for operation in category IIIA conditions.

General characteristics

ENGINES: 2 x ZMKB Progress D-27 Propfans ( 109.8 kN each)
WING SPAN: 35.5 m
LENGTH: 41.0 m
WING AREA: 120 sq m
OPERATING EMPTY WEIGHT: 37,300 kg
MAXIMUM TAKE OFF WEIGHT: 61,300 kg
MAXIMUM PAYLOAD: 17,500 kg
ACCOMODATION: 2 crew + 126-168 passengers
CRUISING SPEED: 830 km/h
RANGE: 1,800 km with maximum payload or 3,500 km with normal payload
SERVICE CEILING: 11,100 m
BALANCED RUNWAY LENGTH: 2,100 m
MAXIMUM WING LOADING: 510.8 kg sq m
MAXIMUM POWER LOADING: 279.1 kg/kN
PROPELLER DIAMETER: 3.8 m

Sources:

Jane's All the World's Aircraft 1994-95 edited by Paul Jackson (Jane's Information Group Ltd)
 

hesham

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From Kryl'ya Rodine 11/21-2016,

the Yak-46.
 

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Triton

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Models of Yakolev Yak-46 concepts.

Source:
http://transport-photo.com/photo/15621/Yakovlev-YAK-46-Model.html
http://transport-photo.com/photo/15618/Yakovlev-YAK-46-Model.html
 

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