russian aircraft designation type early jet fighter built soviet_union shortly world war design began intended use soviet designed engines design heavily influenced captured german jet fighters subsequently redesigned use soviet copy german slower competing soviet aircraft cancelled result modified version different engines revised wing enter production proposal engine aircraft soviet copies modify night fighting proposal accepted design development design bureau began designing twin engined fighter powered known internally item product ultimate design probably influenced captured copy german aircraft oval cross section metal stressed skin fuselage housed single cockpit pilot protected armor plates armored seat bubble canopy provided seat copied aircraft carried total kilograms fuel tanks ahead pilot low mounted straight wing single slight outer flaps split act air brakes soviet aircraft use hydraulic powered controls soviet copy known hung wing streamlined aircraft retracted fuselage designed high wing loading increased aircraft speed reduced dimensions consequently increased landing speeds equipped provision bottles lbf thrust seconds mounted sides fuselage reduced distance nearly percent braking parachute fitted reduce landing distance nose housed armament millimeter millimeter replaced millimeter aircraft carried rounds rounds kilogram high explosive bombs carried underneath forward fuselage engines originally intended ready flight testing late suggested pair engines approved december scale found acceptable february issued order february manufacturer flight testing begin november goal met heavily committed projects like trainer version bomber inexperience units late delivery engines prototype completed mid october flight november test pilots found aircraft easy fly control forces high speed lacked directional stability vertical cured problem hydraulic fitted control system aircraft revealed general public august moscow airfield aircraft began state acceptance trials days later flight testing completed flights completed demonstrated speed kilometers hour mph altitude meters endurance hour minutes handling qualities engine aircraft recommended production significantly slower government declined program terminated seat trainer version planned cancelled cockpit student positioned ahead instructor cockpit separate canopy armament reduced pair millimeters rounds ammunition armor removed save weight prototype begun aircraft intended use designed version engine wind tunnel testing september revealed drag reduced engine mounted wing underneath wing tips redesigned use different significantly reduced changes required entire wing redesigned wing bent inverted accommodate engines flaps replaced simple flaps previously given engine exhaust prototype finished ordered use originally intended aircraft designated called developed lbf thrust lbf required aircraft flight participated august maximum speed mph sea level flight testing revealed lacked longitudinal stability high speeds modifications wing engine failed cure problems coupled mature engines problems caused program cancelled final attempt increase performance basic design wing sections reduced thickness chord ratio swept aircraft fitted pair copies engines lbf thrust armament changed cannon drop tanks fitted underneath night fighter version radar proposed required major structural changes accommodate radar version drawing board operators soviet_union soviet air_force variants planned seat trainer version built modified new wings engines prototype built engines night fighter version proposed version built specifications data early soviet general characteristics crew length wingspan height wing area weight gross weight fuel capacity powerplant lbf thrust speed mph range nmi service ceiling armament cannon rounds fitted instead cannon rpg bombs
Sukhoi Su-9 (1946)