By C. J. Satchwell
Read or Download Windship Technology. Proceedings of the International Symposium on Windship Technology (WINDTECH ' 85), Southampton, U.K., April 24–25, 1985 PDF
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Additional resources for Windship Technology. Proceedings of the International Symposium on Windship Technology (WINDTECH ' 85), Southampton, U.K., April 24–25, 1985
53). A value of 13 has since been The section data Polar Plots for several of the rig alternatives studied are depicted in Figure 11 below: Ο Fig. 11 Ι Section Polar Plots for rig alternatives Of the infinite variety of symmetrical and assymmetrical wing configurations which are available for consideration we ultimately narrowed our consideration to a symmetrical airfoil with a plain flap. 0 or greater. This configuration is compared with other symmetrical wing sections in Figure 12 below. There are many more varieties of wings that have been considered for aircraft applications including wings with leading edge flaps.
Wind Ship designed two 3000 square foot rigs to provide direct comparative results between the unstayed cat rig and the wing sail. The cat rig was installed aboard the M/V MINI LACE, a 3100 dwt general cargo ship in August 1981. Owner's records over 18 months showed a cut in the daily fuel rate of 24% and an increase in average speed of 5% - without throttling back. On one particularly favorable sailing route - New Orleans to Jamaica - the fuel savings came to 36% with an 18% speed increase. The 3000 ft^ wing sail was not built but development of the wing sail also proceeded with the construction and testing of a 1/3 linear scale model of the 3000 square foot design and a subsequent redesign of the original 3000 sq.
These speed predictions together with statistical data on the wind conditions in the serviced sea area allow the estimation of possible average (service-) speeds of a sailing ship-design. As an example Fig. 11 shows the expected average speed V of the 1500 t DWT design INDOSAIL 65/4 depending on the average windspeed U of the respective sea area under the assumption that all courses relative to the true wind are equally frequent. Three lines show the the expected average speed under sail on direct courses, the effect of routing deviation, and the effect of an auxiliary drive providing a minimum speed of 4 Kts in 35% of the time.