Buoy

Ships – Towing or pushing – Submerged object

Reexamination Certificate

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Details

C441S023000

Reexamination Certificate

active

07900571

ABSTRACT:
A buoy is provided with first and second fixed hydrodynamic surfaces (15,16). When the buoy is towed through water by a tether (17), the first hydrodynamic surface (15) generates a downward force that reduces with increased speed through the water. The second hydrodynamic surface (16) generates an upward force that increases with increased speed through the water so that the buoy dives up to an upper critical speed through the water speed and rises beyond said upper critical speed through the water. The downward force of the first hydrodynamic surface (15) overcomes the buoyancy of the buoy at a lower critical speed through the water above, which the buoy dives. The hydrodynamic surface (15) comprises first fins (15) mounted on an outer casing (1) of the buoy and are spaced angularity and extend parallel to the center axis of the buoy which is substantially aligned with the direction of towing. The second hydrodynamic surface (16) comprises second fins (16) mounted on the outer casing arranged upstream of the first fins (15) in the direction of towing. The second hydrodynamic surface (16) is set at an angle of incidence such that it creates a stalled flow condition at said upper critical speed through the water.

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International Search Report for International Application No. PCT/GB2006/003868 dated Jan. 19, 2007.
Patents Act 1977: Search Report under Section 17 for GB Applcation No. GB0521156.0, dated Nov. 24, 2005.
Patents Act 1977 Examination Report under Section 18(3) for GB Application No. GB0521156.0 , dated Apr. 16, 2010.

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