Dobrynin VD-4K
| Dobrynin VD-4K | |
|---|---|
| Type | Six-bank turbo-compound, inline engine |
| National origin | Soviet Union |
| Manufacturer | Dobrynin OKB-36 in Rybinsk |
| First run | June 1950 |
| Major applications | Tupolev Tu-85 |
| Number built | 23 |
|
| |
The Dobrynin VD-4K was a Soviet six-bank, 24-cylinder, turbo-compound, inline engine developed after the end of World War II. It was superseded by turboprop engines before it could be widely used.
Development
The VD-4K, originally designated as the M-253K, was a development of the post-war VD-3TK (M-251K) engine. Like Nazi Germany's experimental Junkers Jumo 222 multibank wartime engine, but in a larger displacement figure — at nearly 59.5 litres — than any planned or tested development of the German powerplant, the VD-4K had six monobloc banks, each with four liquid-cooled cylinders. Three blow-down exhaust, also known as power-recovery, turbines were fitted between the cylinder banks, and a geared centrifugal supercharger and a turbocharger were fitted to the engine itself, which made the VD-4K a turbo-compound engine.
Development began in January 1949 and construction of the prototype began in September of that year. The first engine was completed in January 1950 and it underwent its 100-hour tests in June. It successfully passed its State acceptance tests in January–February 1951. It was evaluated aboard a Tupolev Tu-4 bomber in 1950, itself powered with a quartet of the Shvetsov OKB's 1946-origin, ASh-73 radial engines, each of a displacement figure of 58.1 litres, somewhat close to that of the Dobrynin multibank powerplant design. The Dobrynin engines were most notably fitted to the two prototypes of the Tupolev Tu-85 bomber, but the aircraft, and its engines, was not placed into production because of the promise offered by turboprop engines of immensely more power, like the Kuznetsov NK-12 — itself developed and in test by 1951[1] — and used on the Tupolev Tu-95 strategic bomber[2]
Applications
Specifications (VD-4K)
Data from Kotelnikov[3]
General characteristics
- Type: 6-bank, 24-cylinder, turbo-compound inline engine
- Bore: 148 mm (5.8 in)
- Stroke: 144 mm (5.7 in)
- Displacement: 59.43 L (3,627 cu in)
- Length: 2.5 m (8 ft 2 in)
- Diameter: 1.4 m (4 ft 7 in)
- Dry weight: 2,065 kg (4,552 lb)
Components
- Cooling system: Liquid-cooled
Performance
- Power output: 4,300 hp (3,200 kW)
- Compression ratio: 7:1
See also
- Comparable engines
- Armstrong Siddeley Hyena
- Armstrong Siddeley Deerhound
- Lycoming R-7755
- Daimler-Benz DB 604
- Shvetsov ASh-2
- Wright R-2160 Tornado
- Junkers Jumo 222
- BMW 803
- Related lists
References
Notes
- ↑ Kuznetsov NK-12 (Russian Federation) - Jane's Aero-Engines
- ↑ Gunston, p. 244
- ↑ Kotelnikov 2005, p. 195.