Windship Technology. Proceedings of the International by C. J. Satchwell

By C. J. Satchwell

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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

Sample text

8 Demonstration of WIND SHIP'S 300 sq. ft. Prototype Wing Sail (symmetrical airfoil with single flap) passively feathering without flutter in 25 knots of breeze, gusting to 40K - this proving one of the several unique design features of this proprietary Sail Power Unit - November 1982. Fig. 9 Magnus effect rotor (SPINS'L) aboard Tracker, Vineyard Sound 8/1/83 The propulsive effect of a lifting surface rig is due to the forward component of the total aerodynamic force acting on the rig. This is shown diagramatically in Figure 10.

To minimize the investment costs it is necessary that the ship sails under full canvas most of the time. Unreefed sailing must be possible up to a constant wind with a speed of 9 m/s (17,5 knots), which applies to the Java Sea during 90 % of the year. The maximum heeling of the vessel should not exceed 10 degrees. 6 ο ζ I col FIG. 13 : COMPARISON OF STABILITY HEELING ANGLE ( f ) ^ 36 Fig. 13 is showing that with a breadth of 12,0 m sufficient stability conditions have been obtained for all three modular vessels.

The latter was first used to predict the performance economic aspects of retrofitting sail-assist to m/v MINI LACE. These were subsequently validated based on actual MINI LACE performance data as described in Section V of this paper. The model has to date been used to analyze over 75 specific ship configurations as discussed in Section IX. As various refinements and extensions are made to it, it is becoming and will become increasingly valuable. Chapter III of the MARAD report [2] outlines some of these areas of further refinement as we saw things in 1981.

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