The Sikorsky S-28-A remains one of the lesser-known yet fascinating aircraft concepts associated with legendary aviation pioneer Igor Sikorsky. Although the aircraft never reached full production, the Sikorsky S-28-A represented an important step in Sikorsky’s transition from European aircraft development to the American aviation industry. The project demonstrated Sikorsky’s forward-thinking engineering philosophy and his ambition to develop large multi-engine transport aircraft during the early years of commercial aviation. Today, aviation historians continue to study the Sikorsky S-28-A because it helped lay the conceptual foundation for later Sikorsky aircraft designs. Sikorsky S-28-A The Origins of the Sikorsky S-28-A After leaving Russia following the Russian Revolution, Igor Sikorsky arrived in the United States in 1919. Although he had already achieved international recognition for designing large aircraft such as the famous Ilya Muromets bombers, Sikorsky faced major cha...