Combined wedge-flap for improved ship powering

Details Combined wedge-flap for improved ship powering Combined wedge-flap for improved ship powering

1997-10-10

2000-03-21

Sotelo, Jesus D.

Ships

Hull or hull adjunct employing fluid dynamic forces to...

114285, B63B 100

Patent

active

060389958

ABSTRACT:
The inventive combination of a stern wedge and a stern flap demonstrates hydrodynamic properties which, for purposes of enhancing the powering performance of a ship, are superior to those of either a solitary stern wedge or a solitary stern flap. For many inventive embodiments, the stern wedge portion's lower surface and the stern flap portion's lower surface are slanted at approximately equal angles with respect to the buttock centerline, thereby optimally consolidating the stern portion's lower surface and the flap portion's lower surface so as to effectively create an overall hydrodynamic lower surface which is slanted approximately at one and the same angle.

REFERENCES:
patent: 4896622 (1990-01-01), Thomas
patent: 4961396 (1990-10-01), Sasagawa
patent: 5628272 (1997-05-01), Thomas
Karafiath, G and Fisher, S.C., "The Effect of Stern Wedges on Ship Powering Performance," Naval Engineers Journal, May 1987, vol. 99, No. 3, pp. 27. 8
Righter, J.R., JR and Compton, R., "The Effects of a Bow Bulb and a Stern Wedge on a Large Water Plane Transom Sterned Hullform," U.S. Naval Academy Report EW-25-82, Oct. 1982.
Casanelli, D.S. "Integrated Wedge-Flap, An Energy Saving Device," Prepared for 21st UJNR Marine Facilities Panel Meeting, Tokyo, Japan, May 17-28, 1997.
Cusanelli, D.S. and Karafiath, G., "Integraded Wedge-Flap for Enhanced Powering Performance,Prepared for Fast '97, Fourth International Conference on Fast Sea Transportation," Sidney, Australia, Jul. 21-23, 1997.
Cusanelli, D.S., "Stern Flap Powering Performance on the PC 1 Class Coastal, Full Scale Trials and Model Experiments", Prepared for Patrol '96 Conference, New Orleans, LA, Dec. 5-7, 1996.
Cusanelli, D.S., "DDG 51 Fleet Design with ATD Propellers Ship/Model Correlation and Experiments on Transom Wedge-Stern Flap Combination (Model 5513)," Carderock Div, NSWC, CRDKNSWC/HD-1269-02, Nov. 1996.
Cusanelli, D.S. and Forgach, K.M, "Stern Flaps for Enhanced Powering Performance", Twenty-Fourth American Towing Tank Conference, College Station, Texas, Nov. 2-3, 1995.
Cave, III, W.L. and Cusanelli, D.S., "Effect of Stern Flaps on Powering Performance of the FFG-7 Class", Marine Technology, vol. 30, No. 1, Jan. 1993, pp. 39-50.

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