known aircraft article designation type designed design bureau response order build single seat jet fighter single german time americans british germans flown jet fighters single soviet jet engine development ready production design completed quickly construction flying prototypes protracted factory inexperience building metal aircraft aircraft flight september proved require extensive modifications meet soviet requirements took long test aircraft essentially obsolete time completed variant powerful engine inferior aircraft development work terminated design development ordered design fighter single flow february like rivals chose pod boom layout new fighter based advice design shoulder mounted wing wings metal aircraft fixed leading edges flaps cockpit forward giving pilot good visibility protected armored shaped canopy armored millimetre mounted lower fuselage rounds gun landing gear retracted fuselage gave narrow track soviet derivative engine rated kilograms force lbf mounted cockpit steel heat shield protected rear fuselage engine exhaust air supplied intake aircraft nose split cockpit reaching engine seven tanks fuselage wing carried total kilograms fuel construction scale completed june factory order prototypes given factory factory fully committed programs manufacturing drawings delivered factory end august prototypes delayed plant experience building metal aircraft lacked necessary end year factory managed complete single airframe static load testing showed rear fuselage wings tail needed reinforced opportunity taken vertical tests modifications required months work flying prototype completed july manufacturer testing prototype began august ground testing required replacing engine twice flight september following day ordered small batch jets participate november parade commemorating october revolution tight deadline components incomplete prototypes turned factory new headquarters assembly factory factory joined program aircraft built record time support factory constructed days aircraft completed week half testing evaluation aircraft complete november tested ensure readiness participate parade later given unofficial service designation considered risky fly aircraft moscow wings meant moscow special wheeled trailers built aircraft driven moscow cancelled bad weather tests conducted preparation parade revealed number flaws design including poor directional stability cramped cockpit heating ventilation poor access engine inadequate fuel capacity compounded lack fuel gauge poor elevator control forces aircraft modified correct issues resuming factory testing late modifications entirely successful lateral stability great elevator forces remained weak engine problems plagued tests prototype required engine changes conclusion manufacturer trials april aircraft returned factory extensive modifications wing tips angled downward reduce lateral stability wing redesigned fuselage aerodynamic balancing elevators reduced fuel capacity increased kilograms cockpit widened centimeters fitted seat fore aft armor plates fitted protect pilot new radio aerial mast installed changes added kilograms weight increased drag reduced aircraft speed mph slowed time meters minutes comparison aircraft given higher performance design aircraft submitted state acceptance trials decided continue development meantime developing versions effort increase engine power successful model millimeters longer weighed additional kilograms original engine power increased additional kilograms force lbf thrust engine designated bureau fitted aircraft prototype july designated additional power increased aircraft speed mph sea level mph altitude meters second fastest soviet fighter period powered engines decided submit state acceptance trials fundamental design flaws airframe resolved operators soviet_union soviet air_force variants prototype modified wider cockpit extra fuel prototype modified engine specifications aircraft data early soviet general characteristics crew pilot length wingspan height wing area weight loaded weight powerplant lbf performance maximum speed mph range service ceiling rate climb wing loading thrust weight armament rpg
Lavochkin La-150