Question: The ANT-8 was an experimental flying boat designed by a pioneering aircraft designer of what nationality?
Sentence (from "Andrei Tupolev"): Andrei Nikolayevich Tupolev (Russian: Андрей Николаевич Туполев ; November 10, 1888 – December 23, 1972) was a pioneering Soviet aircraft designer.
Relevant evidence: Yes