INTERNATIONAL YACHT AND SHIP DESIGN SINCE 1989
Phone: 228-235-1881 * Email: info@overingyachts.com
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DESIGN PHILOSOPHY
ALL YACHTS ARE NOT CREATED EQUAL
TUNNEL DESIGN

OYD tunnels are optimized for better flow characteristics compared to the average semi-tunnel. Many designers and builders use constant radius tunnels, with the tangents tapering and coming together as they run forward. Many builders do this because it reduces the cost of the tunnel, and as a result, hinders its efficiency.

Our tunnels maintain parallel tangents with varying cross-sectional radiuses, fanning out as it runs forward. We also have a smooth radius at the tunnel and hull intersect which further enhances efficiency and waterflow.

STRUT DESIGN

Our standard strut design for steel and aluminum vessels is a foil shaped "I" strut, providing the most efficient strut design available. The typical "V" strut is less expensive which is why it is popular with many builders. The "V" strut creates more disturbed waterflow to the propeller, leaving three turbulant trails in which the propeller operates: two trails from the "V" strut, and another very significant trail from the propeller shaft.

Every propeller blade creates a pulse from each trail on every revolution of the propeller. If you have a five blade propeller that equates to 15 pulses per revolution on the "V" strut configuration compared to OYD's five pulses.

Our "I" strut, inline with the propeller shaft, helps to clean the turbulance created by the propeller shaft from the foil strut. This results in one, streamlined turbulant trail, minimizing the impact on the propeller blades. Our "I" struts have been field tested and proven for nearly two decades on both commercial vessels and motoryachts.
OYD 31 Meter Steel Full Displacement Motoryacht with our standard all stainless foil rudder
OYD 31 Meter aluminum Motoryacht with our standard foil "I" strut, foil stainless rudder in our parallel tangent semi-tunnel
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OYD 31 Meter Steel Full Displacement Motoryacht with our standard foil "I" strut
RUDDER DESIGN

OYD standard foil rudders have been in service for decades on a multitude of vessels.

Other builders often minimize rudder size to reduce steering gear cost - at the expense of poor handling and slow helm response. This can be dangerious to owners using their vessels in blue water operation, especially in a quartering, following sea where there is potential for broaching.

Our standard foil rudders are widely used and are very effective in larger displacement and semi-displacement vessels. The stainless wedge rudders (that we developed) for our higher speed applications are proven, reliable and effective.
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