Lotarev D-36
| Industry | Aerospace |
|---|---|
| Headquarters | Ukraine |
| Products | Aircraft engines |
The Ivchenko Progress D-36, also referred to as the Lotarev D-36, is a three-shaft, high bypass ratio turbofan engine currently manufactured by the Ukrainian company Motor Sich.
Design and development
Conceived primarily for the Yak-42, An-72, and An-74 aircraft, this engine represented a significant technological advancement when introduced during the 1970s. The design was led by engineer Vladimir Lotarev. Initial testing commenced in 1971, followed by maiden flight trials in 1974, with serial production starting in 1977.
Its architecture features a single-stage fan consisting of 29 titanium blades encased within a Kevlar composite outer shell, powered by a three-stage turbine. The low-pressure compressor includes six stages with titanium blades and is driven by a single-stage, uncooled low-pressure turbine. The high-pressure compressor comprises seven stages with steel blades, which are driven by a high-pressure turbine also equipped with steel blades.
In line with Soviet-era practices favoring incremental improvements during operational service, the engine evolved through various series from 1 to 3A depending on usage. The Series 1 variant (employed on the Yak-42D) lacked any reverse thrust mechanism; conversely, Series 1A through 3A incorporated bucket-type thrust reversers utilized on the An-72 and An-74 models. Following the dissolution of the Soviet Union, the latest iteration—Series 4A—has been produced since 2002. This version introduced redesigned curved titanium blades along with an integrated reverse thrust system. Enhanced blade geometry combined with proprietary wear-resistant and thermal protection coatings contributed to a reduction in specific fuel consumption from 0.65 to 0.63 kg/h/kgf. Additionally, the engine’s service life was significantly extended to approximately 40,000 hours. The Series 4A is currently implemented on the An-74TK-300 aircraft.
Specifications
| Variant | Thrust (kN) | Bypass Ratio at Start |
Pressure Ratio |
Fan Diameter (mm) | Length (mm) | Weight (kg) | Introduction | Application |
|---|---|---|---|---|---|---|---|---|
| Series 1 | 63.75 | 5.6:1 | 20:1 | 1,333 | 3,930 | 1,124 | 1971 | Yakovlev Yak-42 |
| Series 1A/2A | 63.75 | 5.6:1 | 20:1 | 1,333 | 3,192 | 1,124 | ? | Antonov An-72 Antonov An-74 |
| Series 3A | 63.75 | 5.6:1 | 20:1 | 1,333 | 3,192 | 1,124 | ? | Antonov An-74 |
| Series 4A | 63.75 | 5.6:1 | 20:1 | 1,333 | 3,732 | 1,130 | 2002 | An-74TK-300 |
See also
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