Yakovlev Yak-30 (1948)
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The Yakovlev Yak-30 was an experimental
Soviet The Union of Soviet Socialist Republics. (USSR), commonly known as the Soviet Union, was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 until Dissolution of the Soviet ...
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from the late 1940s. Derived from the
Yak-25 The Yakovlev Yak-25 ( NATO designation Flashlight-A/Mandrake) is a swept wing, turbojet-powered interceptor and reconnaissance aircraft built by Yakovlev and used by the Soviet Union. Design and development The Yak-25 originated from a need f ...
, from which it differed primarily in having wings sweptback 35° at quarter chord, the Yak-30 retained the fuselage, tail surfaces and undercarriage of the earlier fighter.


History

The Yak-30 was designed to meet a Soviet requirement for a fighter capable of Mach 0.9, and able to operate from existing unpaved airstrips. To meet this request required a sweptback wing. Yakovlev based their design on the existing
Yak-25 The Yakovlev Yak-25 ( NATO designation Flashlight-A/Mandrake) is a swept wing, turbojet-powered interceptor and reconnaissance aircraft built by Yakovlev and used by the Soviet Union. Design and development The Yak-25 originated from a need f ...
experimental fighter, but incorporated a modified wing with a sweep of 35 degrees.


Development

The Yak-30 was to be very similar to the former Yak-25, with only a few changes. The fuselage was that of the Yak-25 but with a circular cross-section. The tail was as on the Yak-25 but with a one-piece rudder, and slightly enlarged horizontal surfaces. The three
NR-23 The Nudelman-Richter NR-23 is a Soviet autocannon widely used in military aircraft of the Soviet Union and Warsaw Pact. It was designed by A. E. Nudelman and A. A. Richter to replace the wartime Nudelman-Suranov NS-23 and Volkov-Yartsev VYa-23 ...
cannon armament was retained, and the cockpit layout was unchanged. The wingtip tanks could not be used, as they moved the aircraft's center of gravity too far back, so they were redesigned to fit flush under the wing, midway from the fuselage. The aircraft was powered by a 1,590 kgf (3,505 lbf) RD-500 turbojet.


Testing

The first of two Yak-30 prototypes was given callsign "42", and the number "5" painted on the rudder. This aircraft was successfully test-flown on 4 September 1948 by pilot Anokhin, who continued test-flying the aircraft until 16 December 1948. The second prototype, the Yak-30D, which joined the flight test programme early in 1949, had a 38 cm (15 in) section inserted in the aft fuselage, revised mainwheel doors forming a large section of the fuselage skinning, Fowler-type
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s in place of split flaps, increased fuel and ammunition capacity, and changes to the oxygen system and radio equipment. The Yak-30D was also fitted with air brakes on the aft fuselage. Normal loaded weight (without external fuel) was increased by 110 kg (243 lb). During testing, it reached a speed of
Mach The Mach number (M or Ma), often only Mach, (; ) is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a Boundary (thermodynamic), boundary to the local speed of sound. It is named after the Austrian physi ...
0.935 in a dive. Compared to the Yak-25, top speed was increased by 40 km/h (25 mph) and service ceiling was increased by 1,000 m (3,281 ft). However, the swept wing was found to be unsatisfactory with poor
aileron An aileron (French for "little wing" or "fin") is a hinged flight control surface usually forming part of the trailing edge of each wing of a fixed-wing aircraft. Ailerons are used in pairs to control the aircraft in roll (or movement aroun ...
authority. Although the modifications introduced by the Yak-30D eradicated several shortcomings displayed by the first prototype, the first production deliveries of the superior
MiG-15 The Mikoyan-Gurevich MiG-15 (; USAF/DoD designation: Type 14; NATO reporting name: Fagot) is a jet fighter aircraft developed by Mikoyan-Gurevich for the Soviet Union. The MiG-15 was one of the first successful jet fighters to incorporate s ...
were already taking place by the time that the improved version of the Yakovlev fighter entered flight test, and the results of NII V-VS trials were, therefore, little more than academic. The Yak-30 designation was later reused for the
Yakovlev Yak-30 (1960) The Yakovlev Yak-30 (NATO reporting name Magnum), originally designated Yakovlev 104, was Yakovlev's entry in a competition for the first military jet trainer aircraft designed for Warsaw Pact nations. Designed to succeed the Yak-17UTI, it also ...
.


Specifications (Yak-30)


See also


Notes


Bibliography

* * * Gunston, Bill. ''Yakovlev Aircraft since 1924''. London, UK: Putnam Aeronautical Books, 1997. . {{USAF/DoD reporting names 1940s Soviet fighter aircraft Yak-030 1948 Abandoned military aircraft projects of the Soviet Union Single-engined jet aircraft Aircraft first flown in 1948 Mid-wing aircraft Aircraft with retractable tricycle landing gear