The largest helicopter ever built was an engineering triumph, but a failure in practice. The Soviet Union built the V-12, known to the North Atlantic Treaty Organization (NATO) as the “Homer,” to airlift intercontinental ballistic missiles (ICBMs) into place, avoiding telltale railroad networks that would alert U.S. intelligence.
It an engineering feat at the time but by the time it became operable, it became obsolete.
Read on at Popular Mechanics->
