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The VRDK was designed to operate for 10 minutes continuously and provide a speed increase of 90 km/h (56 mph). Both the Su-5 and the I-250 had top speeds faster than contemporary piston engined fighters but slower than early jet fighters such as the
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In May 1944 the GKO (state committee for defence) ordered the major aircraft design bureaus to start developing aircraft that used a piston engine as their primary powerplant augmented with a small rocket or jet engine booster for short bursts of speed. The
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When tested in the I-250, the thrust from the VRDK was 344 kg (758 lb) and combined output from the piston engine + VRDK was calculated to be the equivalent of 1,976 kW (2,650 hp).
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Only small numbers of Soviet motorjet aircraft were built and none saw service during World War II. After the war interest in motorjets quickly declined as the
Soviets acquired German and British
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mechanism which connected it to the piston engine via a shaft. Air supplied by a duct running from the front of the aircraft was mixed with engine exhaust then compressed and fed to an
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engine to drive a propeller and the VRDK’s single stage axial flow compressor. The VRDK was driven from a step-up gearbox and could be engaged/disengaged by the pilot via a
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the engine. To protect the pilot and airframe, the VRDK was cooled during operation by water from a 78 L (20.6 US gal) tank mounted in the fuselage.
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with the goal of developing a motorjet where a piston engine would be combined with an axial flow compressor. From 1943 work was handed over to the
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251:. Performance figures are for the VRDK only. In practice the VRDK could not be operated without being coupled to an external driver.
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design bureaus opted to use the VRDK developed by
Kholshchevnikov's team which was informally known as the
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where design studies separated into two branches. One branch of research headed by A I Tolstov focused on
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before exiting via a nozzle at the back of the aircraft. Part of the compressor exhaust was also used to
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479:
Antonov, Vladimir; Gordon, Yefim; Gordyukov, Nikolai; Vakovlev, Vladimir; Zenkin, Vyacheslav (1996).
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engines. Research, development and flight testing of Soviet motorjet aircraft had finished by 1950.
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119:. The VRDK was designed to give fighter aircraft a 10 minute performance boost during combat.
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the other headed by
Professor K.V Kholshchevnikov focused on
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OKB Sukhoi: A history of the design bureau and its aircraft
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Design work on VRDK technology started in 1941 at the
334:205 kg (452 lb) for 10 minutes of flight
107:(Vozdushno-Reaktivniy Dopolnitelniy Kompressor)
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425:Soviet Mixed Power Experimental Fighter Aircraft
109:(Russian: "Jet-Propelled Auxiliary Compressor”)
451:Marriott, Leo (2018). "2 - The Soviet Union".
181:used a single 1,230 kW (1,650 hp)
453:Images of War: Early Jet Fighters 1944-1954
389:. UK: Shrewsbury: Airlife. pp. 69–76.
387:MiG: Fifty years of secret aircraft design
385:Belyakov, Rostislav Apolossovitch (1994).
269:~8 m (26.2 ft) including ducting
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166:A diagram of the VRDK as installed in the
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281:140.9 kg (310.6 lb) VRDK only
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115:developed in the Soviet Union during
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60:Central Institute of Aviation Motors
516:Soviet and Russian aircraft engines
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303:Afterburner ring with seven nozzles
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129:Central Aerohydrodynamic Institute
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483:. UK: Midland. pp. 63–69.
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157:Kholshchevnikov accelerator
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328:344 kg (758 lb)
275:~0.7 m (2.3 ft)
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255:General characteristics
423:Harkins, Hugh (2018).
339:Thrust-to-weight ratio
230:Mikoyan-Gurevich I-250
179:Mikoyan-Gurevich I-250
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141:spark ignition engines
123:Design and development
96:Mikoyan-Gurevich I-250
455:. UK: Pen and Sword.
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211:Messerschmitt Me 262
105:Kholshchevnikov VRDK
359:Caproni Campini N.1
354:Ishikawajima Tsu-11
294:Single-stage axial
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91:Major applications
427:. UK: Centurion.
332:Fuel consumption:
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511:Motorjet engines
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137:diesel engines
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224:Applications
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117:World War II
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316:Performance
292:Compressor:
279:Dry weight:
235:Sukhoi Su-5
195:supercharge
191:afterburner
175:Sukhoi Su-5
505:Categories
490:1857800125
396:1853104884
365:References
307:Fuel type:
299:Combustors
286:Components
82:First run
273:Diameter:
246:Data from
173:Both the
74:Built by
348:See also
322:Maximum
263:Motorjet
218:turbojet
113:motorjet
40:Motorjet
267:Length:
249:Harkins
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324:thrust
187:clutch
153:Sukhoi
111:was a
310:Avgas
261:Type:
168:I-250
85:1945
36:Type
22:VRDK
485:ISBN
457:ISBN
429:ISBN
391:ISBN
343:2.44
209:and
177:and
151:and
103:The
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