Lyulka RTD-1 jet engine
design.
Lyulka RD-1 jet engine
design.
In 1943 Mikhail I. Gudkov began to design the Gu-VRD
fighter, which was to be powered by a single example of Lyul'ka's latest engine
mounted in a 'stepped' fuselage. Like many early jet designs all over the
world, this was really a piston fighter airframe fitted with a jet instead of
the piston unit, but Gudkov had previously worked with S. A. Lavochkin on the
LaGG-3 piston fighter and knew what he was doing. The Gu-VRD had its engine
placed in the bottom of the fuselage aft of the nose section, giving in side
view a 'step' behind the engine nozzle after which the rearward fuselage had a
much smaller cross section; as we shall see this arrangement was to be used by
other first-generation Soviet jet fighters. The Gu-VRD was a single-seater and
had a nose air intake and a tailwheel undercarriage and was armed with one 20mm
ShVAK cannon and one 12.7mm (0.5in) BS machine gun; internal fuel load was
400kg (8821b), estimated range 700km (435 miles) and the time to 5,000m
(16,404ft) was 1.39 minutes.
On 10th March the project documentation was submitted to official
circles but, after appraisal by the Council of People's Commissars, it was
rejected, simply because it was felt that a suitable engine which gave the
required power would not actually be available for some time. I. I. Safronov,
one of the officials, wrote on 17th April 'apparently the aircraft would fly
with the claimed speed but the problem is that, as of today, there is no
engine, just the name of its designer'. Thus, due to the delays with the
Lyul'ka engine the Gu-VRD was never built, and by the time work on Lyul'ka's
later S-18 power unit was under way, Gudkov's OKB had been disbanded. VRD
stands for Vozdooshno-Reaktivnyy Dvigatel, or Air Reaction Engine. Gudkov's
presentation also noted that he was working on a fast bomber powered by two of Lyul'ka's
14.7kN (3,3051b) thrust engines. This had an estimated take-off weight of
6,500kg (14,3301b), a top speed of at least 780km/h (485mph) at 600m (1,969ft)
altitude and a range of at least 1,200km (746 miles).
In the spring of 1943 Lyul'ka and his team moved to Moscow
and on 20th May specialists from the People's Commissariat evaluated his new
engine and judged that it was not sufficiently developed, so there was clearly
no likelihood either of a prototype power unit being built. As a result, and to
help with the overall development of this new form of propulsion, the Central
Institute of Aviation Motors (TsIAM) established a jet engine research
laboratory during the following August with Lyul'ka as its chief.
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