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Showing 1 to 20 of 53 for “"planing"”.
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Advancements of Stepped Planing Hulls
… straight line calm water performance of stepped planing hulls has been studied experimentally, by prediction method, and numerically. A model test was conducted to provide a systematic understanding of the effects that displacement and step location have on the performance of a stepped planing …
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CFD based design of a high speed planing hull with cambered planing surface, V-step and hydrofoil
… efficiency and performance characteristics of planing hulls. In the 1960's, Eugene Clement showed that considerable reductions in resistance at high speeds can be obtained by converting a conventional planing hull to a Dynaplane stepped planing hull. A Dynaplane stepped planing hull refers to a …
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Model testing and computational analysis of a high speed planing hull with cambered planing surface and surface piercing hydrofoils
… Ship Laboratory (iShip) designed a high-speed planing hull form that was based on the Model Variant 5631 developed at the US Navy's David Taylor Model Basin [7] [3] [5]. This model was a variant of the parent hull 5628. The 5631 variant was a model of the 47 foot Motor Lifeboat of the US Coast …
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Dynamic pressures and plating response in a medium speed planing hull
Thesis: Nav. E., Massachusetts Institute of Technology, Department of Naval Architecture and Marine Engineering, 1959
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A Theory and Analysis of Planing Catamarans in Calm and Rough Water
A planing catamaran is a high-powered, twin-hull water craft that develops the lift which supports its weight, primarily through hydrodynamic water pressure. Presently, there is increasing demand to further develop the catamaran's planing and seakeeping characteristics so that it is more …
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Analysis and mitigation of mechanical shock effects on high speed planing boats
United States Special Forces use high-speed planing boats in the performance of their missions. Operation of these boats, particularly in rough seas, exposes the occupants to severe mechanical shock exposure that has been linked to significant increase in the rates of acute and chronic injury. …
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Hydrodynamics of high speed planing hulls with partially ventilated bottom and hydrofoils
… step on the performance of sea going V-stepped planing hulls is investigated using numerical methods. The shape of the step was designed to decrease the Drag/Lift ratio of the hull in full planing regime (Fr[delta sign turned upside down] = 6 ). A numerical method, complementary to the existing …
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SERUM ANTI-PHOSPHORYLCHOLINE AND ANTI-CARDIOLIPIN CONCENTRATIONS FOLLOWING PERIODONTAL SCALING AND ROOT PLANING
… chronic periodontitis received scaling and root planing in conjunction with blood sample analysis to determine if periodontal instrumentation resulted in changes in these serum antibodies. If plaque bacteria are responsible for an immune response then serum levels of these antibodies should …
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Verification and Validation Study of OpenFOAM on the Generic Prismatic Planing Hull Form
… will be performed on Generic Prismatic Planing Hull (GPPH) using OpenFOAM v1806 solver interFoam. The numerical simulation will be compared with the experimental result, which is a new set of high-quality experimental tests performed on a large model of a high deadrise prismatic planing …
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A Hybrid Method for Predicting Lift and Drag of Semi-planing/Semi-displacement Hull Forms
… hydrodynamic lift. Therefore, a need for semi-planing/semi-displacement hullforms exists for vessels to carry relatively high loads (between 500 and 3000 tons) with a general length Froude number range between 0.4 and 1.0. A hybrid method for calculating the lift and drag of …
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Concept for planing conservation schemes for farm animal genetic diversity focussed on German chicken breeds
Die genetische Vielfalt stellt die Basis für zukünftige Zuchtarbeit in allen Nutztierarten dar und muss daher erhalten werden. Für die Konzeption von Erhaltungsprojekten ist es nötig Kriterien für die Wahl der Rassen zu finden, die mit höchster Priorität erhalten werden sollen. In dieser Studie …
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Design of a high speed planing hull with a cambered step and surface piercing hydrofoils
Design of a high speed planing hull is analyzed by implementing a cambered step and stem, surface piercing hydrofoils, commonly known as a Dynaplane hull. This configuration combines the drag reduction benefits of a stepped hull with a fully ventilated after body by using a stem stabilizer. The …
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The Public Land Manager in Collaborative Conservation Planing: A Comparative Analysis of Three Case Studies in Montana
Collaborative Conservation Planning (CCP) has proven to create solutions to challenges many Montana and Americans face with protecting or restoring their natural resources and rural lifestyles from previous non-sustainable land use practices and rural land development. This planning model has …
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The Public Land Manager in Collaborative Conservation Planing: A Comparative Analysis of Three Case Studies in Montana
Collaborative Conservation Planning (CCP) has proven to create solutions to challenges many Montana and Americans face with protecting or restoring their natural resources and rural lifestyles from previous non-sustainable land use practices and rural land development. This planning model has …
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Experimental and Numerical Investigation of Forward and Aft Swept Stepped Planing Hulls in Calm Water and Regular Waves
Stepped hull forms are hulls with a vertical step in the hull bottom to improve performance at top speed. Stepped hulls are well documented anecdotally and scientifically to improve calm water performance at high speeds, but commonly demonstrate dangerous and unexpected dynamic instabilities during …
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Hydroelasticity of High-Speed Planing Craft Subject to Slamming Events: An Experimental and Numerical Investigation of Wedge Water Entry
High-speed planing craft operating in waves are subject to frequent water impact, or slamming, as a portion or whole of the craft exits the water and re-enters at high velocity. The global load induced by slamming can cause fatigue-related damages to structures. The local slamming can cause local …
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Improved Design Method for Cambered Stepped Hulls with High Deadrise
… cambered step is designed to carry 90% of the planing vessels weight with the remaining 10% being support by a stern mounted hydrofoil. The method requires multiple design iterations in order to achieve an optimal design. Clement stated that the method was not suitable for cambered planing …
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Optimal deadrise hull analysis and design space study of naval special warfare high speed planning boats
… (Sea, Air, Land) frequently employ high speed planing boats (HSPBs) in the performance of their missions. Operation of these vessels in normal and adverse conditions exposes personnel to severe mechanical shock. Anecdotal evidence and recent medical studies conducted by the Naval Health …
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Hydrodynamic behaviour of gliding hydrofoil crafts
… Technology, China. This craft is similar to a planing hull but with a hydrofoil in the front part of its body. The fixed hydrofoil improves the seakeeping properties and stability of the craft compared with a conventional planing hull. In addition, the GHC has a more simple structure and higher …
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