The Su-9 Fishpot grew from Sukhoi's high-speed interceptor work and used a delta wing, nose intake, and Lyulka turbojet arrangement related in layout philosophy to the Su-7 family. The Su-11 was the improved Fishpot-C derivative with upgraded radar and missile integration.
Both aircraft were built around the Soviet air-defense mission: climb, accelerate, receive ground-control vectors, and launch air-to-air missiles at intruding bombers. Their narrow mission fit gave them speed and altitude performance but limited flexibility against low-flying or maneuvering targets.
The Su-9 saw larger production, while the Su-11 remained a more limited upgrade. Together they formed an important step in the Sukhoi interceptor lineage before the more capable Su-15 Flagon became the stronger long-term PVO aircraft.
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