I was fortunate to hear this remarkable man speak at a Royal Aeronautical Society lecture in London. He even graciously answered a question from me. He changed the lives of many thousands of people by introducing them to helicopters, by making them light and simple. The R22 weighed half of the Enstrom I learned on - and it burned half of the fuel. His designs were a game-changer. Such engineering giants don’t come around often - I think he is up there with the best.