Sikorsky Russky Vityaz
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English: The Sikorsky Russky Vityaz (Russian Knight) or Le Grand (The Great), later designated as Sikorsky S-21, was the very first usable four-engined aircraft in the world. The large biplane was designed and built by Igor Sikorsky in Imperial Russia in the spring of 1913.
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Sikorsky S-21 Russky Vityaz (Le Grand) early version
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Sikorsky S-21 Russky Vityaz (Le Grand) improved version