Yakovlev Yak - 19 The Yakovlev Yak - 19 was a prototype Soviet fighter aircraft built in 1947 . It was the second Yakovlev jet fighter after the Yak - 15 , and the first OKB aircraft designed from the onset to have an all - metal stressed skin , and a hydraulic system . The Yak - 19 was the second Soviet aircraft to use an afterburning turbojet , the Klimov RD - 10F , and the last Yakovlev Aircraft to use a version of the German Jumo 004 - derived RD - 10 jet engine . Only two examples were built . USAF / DoD reporting name - " Type 7 " . Design and development . In the spring of 1946 OKB - 115 set about designing the Yak - 19 . The aircraft was to have mid set , all - metal , straight wings and levered - suspension tricycle undercarriage , which would become the datum for future Fighter development in the USSR . The design of the Yak - 19 was a radical departure from the " step " layout of the earlier Yak - 15 and Yak - 17 . All tail surfaces were of metal construction , though only the elevators had tabs . The tricycle landing gear were pneumatically operated , and had three nitrogen / oleo struts . The nosewheel was castoring , and retracted forward behind the engine ducts , faired by two doors . Fuel capacity was 815 liters ( 179 . 3 gallons ) in two fuselage tanks , plus an additional 11 liters stored in the starter engine to assist ignition of the afterburner , which was fueled by a separate electrically driven pump . The cockpit had a bullet - proof windscreen . A RSIU - 6 radio was standard . Armament consisted of two Nudelman - Suranov NS - 23 cannons , with 70 - 75 rounds each . Testing . Two prototypes were built . Each remained unpainted . They were found to be only slightly heavier than the earlier Yak - 15 and Yak - 17 . The first prototype , ( Yak - 19 - I ) , had callsign " Yellow 24 " , and a number " 5 " on the lower rudder . It first flew on the 8 January 1947 with test pilot M I Ivanov at the controls . In flight the aircraft was found to have pleasant and predictable characteristics . Its worst aspect was the afterburner , which slightly lowered the aircraft ' s dry thrust . Worse yet , it was ignited by a complicated and totally unreliable procedure which would have been useless in combat . This prototype was later modified with a square - tipped rudder . The second prototype ( Yak - 19 - II ) , had callsign " Yellow 25 " , and the number " 2 " on the lower rudder . It was seen at the 3 August 1947 Tushino flypast . Differing in minor details , the Yak - 19 - II had a 4 degree dihedral on the horizontal stabiliser and underslung tip tanks , as on the Yak - 17 . S N Anokhin was the test pilot during the NII - VVS testing , which was completed on 21 August 1947 . He agreed that the aircraft possessed good handling qualities , but felt that the engine was outdated , weak and unreliable . After failing State acceptance tests ( for reasons including high stick forces , no heating or ventilation , and inadequate armour ) further development was abandoned . The death knell of the Yak - 19 was also sounded by the arrival of the Rolls - Royce Derwent - derived , Klimov RD - 500 , which gave quantum leaps forward in thrust , reliability , longevity , and ease of maintenance . No ASCC reporting name was ever allotted , as the aircraft remained unknown to the west until the late 1970s .