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How Rotor Ship Gets Power Power for the Rotor Ship Depends Upon Wind as Well as Revolving Cylinders—Model Proves Principle To Be Correct F ALL recent inventions in the QO marine field none it is safe to say has created more universal interest and curiosity than the Flettner rotor — ship. The possibility, based on the reported successful experiments on a full sized ship, of the return to the use of wind power once more for the propulsion of vessels, has deeply stirred the imagination of the general public as well as marine engineers and shipping men. On account of this deep interest the Propeller Club of New York an informal association composed of men engaged in the ma- rine industry, at its regular luncheon meeting on Feb. 5 in New York, in- vited one of its members, Prof. F. O. Willhofft, of the Th. Goldschmidt Corp., New York, to address the club mem- bers and their guests on the rotor ship a subject on which he is particularly well informed. He said in substance. Flettner’s rotor ship has created in- terest not only in engineering circles but among the general public because people were lead to believe that some hitherto unknown force had been dis- covered. Lack of authentic informa- tion added to the mystery. Since the facts have become known, people have gone to the other extreme and _ tried to minimize the importance of the invention. The principle misconception has been in regard to the fact that the Flettner rotor ship depends on wind power for its propulsion and is just as helpless as any sailing ship when there is no wind, having in that case to-depend on an auxiliary engine and propeller. The Flettner ship is the result of evolution quite the same as any other important invention. The scientific study of flow laws for in- stance in connection with the airplane lead to radical improvements in de- sign of hulls of vessels and of ship propellers, as well as to aerial pro- pellers and it has brought about the invention of the contra-propeller and radical improvements in steam and water turbines, turbo pumps and com- pressors. Professor Magnus, a physicist, after whom the so-called Magnus effect was named, did not actually discover this effect but rather was the first to give a scientific explanation for it. At that time, in 1852, the problem was to ex- plain the peculiar action of a projectile spinning about its longitudinal axis when exposed to a lateral wind. The same effect is known to every tennis and baseball player. In 1919 the well known Professor Foettinger made use of the Magnus effect in the construc- tion of a ship propeller which in place of blades had rotating cylinders. The experiments were discontinued, how- WITH THIS MODEL THE PRINCIPLE OF THE ROTOR SHIP WAS CLEARLY DEMONSTRATED—PROFESSOR WILHOFFT IS STANDING SECOND FROM LEFT 90