The Lavochkin La-11 (NATO reporting name Fang) was an early post-World War II Soviet long-range piston-engined fighter aircraft. The design was essentially that of a Lavochkin La-9 with additional fuel tanks and the deletion of one of the four 23 mm Nudelman-Suranov NS-23 cannons. Like the La-9, the La-11 was designed to be a low to medium-altitude general-purpose fighter, although the additional fuel tanks were added with the intent of employing the La-11 in the escort fighter role. In reality, the La-11 would go on to serve almost exclusively as an interceptor, with the majority of its engagements during the Korean War seeing it pitted against bomber and transport aircraft. While an improvement over earlier aircraft, the La-9 and La-11 retained the poor high-altitude performance that was common among many Soviet piston-engined airframes, with the La-11 enjoying only a 20 km/h (12 mph) advantage over the Boeing B-29 Superfortress at the latter’s cruising altitude. This relatively poor high-altitude performance combined with the arrival of the jet engine led swiftly to the La-11s (and La-9s) in most frontline Soviet Air Force (VVS) units being replaced with early Soviet jets such as the Mikoyan-Gurevich MiG-15. While quickly ousted from service with the VVS, the La-9 and 11 would both see service well into the 1950s and 1960s with the Chinese People’s Liberation Army Air Force and the North Korean People’s Army Air and Anti-Air Force, with the last La-11s being retired from the former in 1966. Development One of the recommendations from the government testing of Lavochkin La-130 (Lavochkin La-9 prototype) was to further develop it into a long-range escort fighter. The resultant La-134 prototype (also sometimes referred to as La-9M) featured increased fuel and oil capacity. Armament was reduced to three cannons. The prototype flew in May 1947. The second prototype, La-134D had fuel capacity increased by an additional 275 L (73 US gal) with wing and external fuel tanks. The aircraft was fitted with larger tires to accommodate the increased weight and amenities for long flights such as increased padding in the seat, armrests, and a urinal. In addition, a full radio navigation suite was installed. Not surprisingly, combat performance with a full fuel load suffered. However, as the fuel load approached that of La-9, so did the performance. The aircraft was found to be poorly suited for combat above 7,000 m (23,000 ft). The new fighter, designated La-11 (OKB