Sailors: 883 m² sail area and diesel auxiliary engine
Rotor ship: Diesel engine with 162 kW and two Flettner rotors with 7.5 kW each, power supply from 33 kW diesel engine; the area exposed to wind of the two towers (projected "sail area") was 88 m².
Optimal drive conditions existed when the circumferential speed of the rollers was around 3.5 times the wind speed and the wind came in from the side. Aft wind is unsuitable for a rotor ship because the direction of force of the roller sails is 90 ° to the wind direction.
The ship was named after the Magdeburg district Buckau . It was later renamed Baden-Baden , brought to America and caused a sensation when it arrived in New York on May 9, 1926. In 1931 it was destroyed by a storm in the Caribbean . However, the Flettner rotors had already been removed by this time.
The experiment was technically successful, but was unsuitable as the main drive, especially for larger ships. What is particularly interesting about this type of drive compared to sails is that the forces that occur reach a maximum at a wind speed of 12 m / s, above which they only depend on the rotational speed of the cylinders.
Further data
Completion: 1920 as schooner / October 1924 as rotor ship
Sister ships (but three-masted topsail schooner without rotor drive): Gaarden , Datteln, Annen
literature
Emo Descovich: Flettner's oars, sails and rotor: a popular attempt at explanation . Austrian Federal Publishing House for Education, Science and Art, Vienna 1925.
Josef Esser: The Flettner ship . GD Baedeker, Essen 1925.
Anton Flettner: My way to the rotor . Köhler & Amelang, Leipzig 1926.
Kurt Graffstädt: The Flettner rotors in a generally understandable form Polytechnische Verlagsgesellschaft M. Hittenkofer, Strelitz in M. 1925.
The Flettner ship . In: Marine-Rundschau. Journal of marine life . Mönch, Bonn 1924, pp. 361–371. ISSN 0025-3294
Czeslaw A. Marchaj: Aerodynamics and hydrodynamics of sailing; Klasing, Bielefeld 1982, ISBN 3-7688-0390-2
Curt Hanfland: Modern mechanical engineering . Publishing house of the literary works "Minerva", Leipzig 1928.
Croseck, Heinrich: From sailing ship to rotor ship . In: Institut für Meereskunde, Berlin (Ed.): Meereskunde . tape16 , no.3 . ES Mittler & Sohn, Berlin 1928.
↑ It is worth mentioning, however, that the stability of the conversion was significantly increased, since the rig , which weighed 35 tons, was replaced by the two towers, which, including the substructure, only weighed around four tons. (Source: Lit .: Marchaj, p. 194)
↑ a b c Modern mechanical engineering, Volume 2, p. 676f
↑ Data according to NACA Technical Note No 228, 1925 and Marchaj. The information on the speed varies from 120 revolutions per minute (NACA) to 150 (Time Magazine 1925) to 700 (Lit. Marchaj, 1979, German 1982, p. 194).
↑ Marchaj p. 195f. For the transport of goods that do not require high freight rates, Marchaj postulates the future economic profitability of the drive system due to the constant rise in the price of fossil fuels.
↑ According to the Time Magazine report of March 2, 1925 (see web links), after a successful maiden voyage from Danzig via Kiel and the Kiel Canal in Leith in six days, sometimes under severe weather conditions and headwinds . The article notes that cargo steamers usually cover the distance in 2/3 of the time, but the performance is "at least equal to, if not superior, that of a cargo sailor". Lit .: Marchaj states (probably taking into account successful practical tests) for the completion “1925–26”.
