Title: Methods and apparatus for controlling the propulsion of aquatic vessels incorporating such apparatus

Abstract: For the purpose of controlling the position of an oil rig or other vessel, it is provided with a plurality of steerable thrusters, one pair being located at the bow and one pair at the stern. The two thrusters of each pair are arranged to exert thrust at an angle of 90.degree. so that the net thrust vector may be "steered" merely by controlling the magnitude and direction of thrust of each thruster. By this means it is only necessary to change the directions of the thrust of the thrusters relatively infrequently.

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Inventors: Blumberg, Jonathan Mark (Creaton, EN)

Application Number: 524566
Filing Date: 1974-11-18
Publication_date: 1976-06-29
Assignee: Gec-Elliott Automation Limited (Borehamwood, EN)
Primary Class(es): 114/144B 701/99, 701/116, 701/300
Other Classes:
US Patent Ref:

837288	Dec, 1906	Dieckmann	114/148.
2735393	Feb, 1956	White	114/147.
3311079	Mar, 1967	Berne	114/144.
3508512	Apr, 1970	Desrayaup et al.	114/144.
3509844	May, 1970	Doyle	114/147.
3730126	May, 1973	Zunderdorp et al.	114/144.

Other Refs:
Primary Examiner: Kunin, Stephen G.
Assistant Examiner:
Attorney: Kirschstein, Kirschstein, Ottinger & Frank