A Contender dinghy planing on a broad reach. Note the typical way the bow lifts up while the stern skims over the water.
Many forms of marine transport make use of planing, including fast ferries, racing boats, seaplanes, and water skis. Most surfboards are planing or semi-planing hulls. Beyond planing, fast vessel designs have seen a transition to hydrofoil designs.
The earliest documented planing sailboat was a proa built in 1898 by Commodore Ralph Munroe. It was capable of speeds of more than twice the hull speed.[citation needed]
Planing a sailing dinghy was first popularised by Uffa Fox in Britain. In 1928 Fox introduced planing to the racing world in his International 14 dinghy, Avenger. That year he gained 52 first places, 2 seconds, and 3 third places out of 57 race starts.[1][2]
This performance was noticed by other designers who further developed them. Over the years, many dinghies have acquired the ability to plane. Materials advances have allowed for lighter boats that will plane faster and in lighter air. There are now many high-performance dinghies (sometimes called skiffs) that can plane to windward.[3]
At rest, a vessel's weight is borne entirely by the buoyant force. Every hull acts as a displacement hull at low speeds: the buoyant force is mainly responsible for supporting the craft. As speed increases, hydrodynamic lift increases, and the buoyant force decreases as the hull lifts out of the water, decreasing the displaced volume. At some speed, lift becomes the predominant upward force on the hull and the vessel is planing.
A simple model of this effect is a solid slab of material that is heavier than water (like a steel plate) but is shaped and oriented to have a positive angle of attack. At rest, the slab will sink because it is heavier than water; the buoyant forces are overwhelmed by the force of gravity. However, if the slab is kept in the same orientation and pulled horizontally through the water, it will force the incoming water downward. This results in a reactionary force upward on the slab. At a high enough speed, this reactionary force (plus any small buoyant force) is larger than the force of gravity and the slab will stay afloat. In this way, the horizontal force (which may be supplied by a motor or a sail) is converted into a vertical force upwards. The concept of planing is often interpreted as analogous with aerodynamic lift (See lift on an airfoil). In reality the acting forces are different.
Although any hull will plane if enough power is provided and enough speed is attained, a hull designed for operation in the planing realm is sometimes distinguished by a flat run aft. In other words, in side view, the bottom is more or less a straight line towards the stern. (Exceptions to this include surfboards and other recreational planing hulls, which utilize rocker throughout for enhanced maneuverability when banking through turns.) In contrast, in a displacement, or non-planing hull, the bottom is curved in side view (the curvature is called "rocker") all the way from bow to stern, in order to minimize wave drag. In front view, the sections in the aft area may be straight, as in a racing hydroplane, to maximize planing forces and speed, but for practical reasons of stability and comfortable ride are often V-shaped, especially in boats intended for offshore use.
To plane, especially to initiate planing, the power-to-weight ratio must be high, since the planing mode of operation involves moving the hull at speeds higher than its natural hull speed. All boat designs for planing benefit from minimised weight; planing powerboats are commonly made from light alloy or use other reduced-weight construction techniques- RIBs are typical examples. Planing sailing boats need a good sail area and powerboats need a high-power engine. Steps and chine ridges may also be incorporated into the design to encourage both ease of planing and stability.
Most surfboards, although unpowered, are planing or semi-planing hulls. They utilize the push of the waveform more or less in combination with gravity and specific angles of attack for the airfoil to maximise propulsive force and reduce the net downforce and thus achieve planing lift.
^"UFFA FOX (1898-1972)". Uffa Fox On-Line. Tony Dixon. Retrieved 5 June 2018.
^"History". International 14. International 14 Class Association. Retrieved 5 June 2018.
^Cox, Dave (2000). The Sailing Handbook. Stackpole Books. In the UK, the well-known designer Uffa Fox... researched and developed planing.... It is from his trend-setting design that most of today's high-performance sailing dinghies have evolved. Boats have also become lighter through the low weights achieved by today's hi-tech building materials. They are therefore able to plane much faster in much less wind, and many are capable or planing to windward.
^Sleight, Steve (2011). The Complete Sailing Manual, Third Edition. DK Publishing. p. 126. ISBN9780756697600.
Videos of planing sailboards from the UK Windsurfing Association
October 30, 2023
planing, boat, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, planing, boat, news, newspapers, books, scholar, jsto. This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Planing boat news newspapers books scholar JSTOR September 2014 Learn how and when to remove this template message Planing ˈ p l eɪ n ɪ ŋ PLAY ning is the mode of operation for a waterborne craft in which its weight is predominantly supported by hydrodynamic lift rather than hydrostatic lift buoyancy A Contender dinghy planing on a broad reach Note the typical way the bow lifts up while the stern skims over the water Many forms of marine transport make use of planing including fast ferries racing boats seaplanes and water skis Most surfboards are planing or semi planing hulls Beyond planing fast vessel designs have seen a transition to hydrofoil designs Contents 1 History 2 How planing works 3 Sailing techniques used to promote planing 4 See also 5 Notes 6 External linksHistory editThe earliest documented planing sailboat was a proa built in 1898 by Commodore Ralph Munroe It was capable of speeds of more than twice the hull speed citation needed Planing a sailing dinghy was first popularised by Uffa Fox in Britain In 1928 Fox introduced planing to the racing world in his International 14 dinghy Avenger That year he gained 52 first places 2 seconds and 3 third places out of 57 race starts 1 2 This performance was noticed by other designers who further developed them Over the years many dinghies have acquired the ability to plane Materials advances have allowed for lighter boats that will plane faster and in lighter air There are now many high performance dinghies sometimes called skiffs that can plane to windward 3 How planing works edit nbsp Royal Navy World War II motor torpedo boat planing at speed on calm water showing its hard chine hull note how most of the forepart of the boat is out of the waterAt rest a vessel s weight is borne entirely by the buoyant force Every hull acts as a displacement hull at low speeds the buoyant force is mainly responsible for supporting the craft As speed increases hydrodynamic lift increases and the buoyant force decreases as the hull lifts out of the water decreasing the displaced volume At some speed lift becomes the predominant upward force on the hull and the vessel is planing A simple model of this effect is a solid slab of material that is heavier than water like a steel plate but is shaped and oriented to have a positive angle of attack At rest the slab will sink because it is heavier than water the buoyant forces are overwhelmed by the force of gravity However if the slab is kept in the same orientation and pulled horizontally through the water it will force the incoming water downward This results in a reactionary force upward on the slab At a high enough speed this reactionary force plus any small buoyant force is larger than the force of gravity and the slab will stay afloat In this way the horizontal force which may be supplied by a motor or a sail is converted into a vertical force upwards The concept of planing is often interpreted as analogous with aerodynamic lift See lift on an airfoil In reality the acting forces are different Although any hull will plane if enough power is provided and enough speed is attained a hull designed for operation in the planing realm is sometimes distinguished by a flat run aft In other words in side view the bottom is more or less a straight line towards the stern Exceptions to this include surfboards and other recreational planing hulls which utilize rocker throughout for enhanced maneuverability when banking through turns In contrast in a displacement or non planing hull the bottom is curved in side view the curvature is called rocker all the way from bow to stern in order to minimize wave drag In front view the sections in the aft area may be straight as in a racing hydroplane to maximize planing forces and speed but for practical reasons of stability and comfortable ride are often V shaped especially in boats intended for offshore use To plane especially to initiate planing the power to weight ratio must be high since the planing mode of operation involves moving the hull at speeds higher than its natural hull speed All boat designs for planing benefit from minimised weight planing powerboats are commonly made from light alloy or use other reduced weight construction techniques RIBs are typical examples Planing sailing boats need a good sail area and powerboats need a high power engine Steps and chine ridges may also be incorporated into the design to encourage both ease of planing and stability Most surfboards although unpowered are planing or semi planing hulls They utilize the push of the waveform more or less in combination with gravity and specific angles of attack for the airfoil to maximise propulsive force and reduce the net downforce and thus achieve planing lift Sailing techniques used to promote planing edit nbsp Albacore dinghy planingPlaning may be achieved in most sailing dinghies In light to moderate conditions planing is best initiated by a combination of the following 4 5 Maximise power sail on a reach or broad reach to begin Minimise surface induced drag raise the centreboard or daggerboard about half way Maintain power when a gust hits bear away slightly and ease the sheets As a gust begins to pass steer slightly to windward to keep the apparent wind forward Maintain flat form of immersed sections of hull keep the hull level side to side trapeze if necessary Move your weight aft to lift the bow Maintain power if necessary flick or pump the sails although there are some restrictions on doing this in a race Seek optimal form and speed of immersed hull if there are waves surf down them to initiate planing See also edit nbsp Sports portal nbsp Transport portalHydroplane boat racing powerboats designed to use lift from the hull to reduce drag Hydrofoil a more advanced concept to further reduce drag by supporting the weight of the hull on specialised wings at speed Dinghy racing Dinghy sailing Sportsboat WindsurfingNotes edit UFFA FOX 1898 1972 Uffa Fox On Line Tony Dixon Retrieved 5 June 2018 History International 14 International 14 Class Association Retrieved 5 June 2018 Cox Dave 2000 The Sailing Handbook Stackpole Books In the UK the well known designer Uffa Fox researched and developed planing It is from his trend setting design that most of today s high performance sailing dinghies have evolved Boats have also become lighter through the low weights achieved by today s hi tech building materials They are therefore able to plane much faster in much less wind and many are capable or planing to windward Sleight Steve 2011 The Complete Sailing Manual Third Edition DK Publishing p 126 ISBN 9780756697600 Proctor Ian 1968 Boats for Sailing Macdonald and Co Council of Industrial Design ISBN 9780356015217 External links editVideos of planing sailboards from the UK Windsurfing Association Retrieved from https en wikipedia org w index php title Planing boat amp oldid 1171845644, wikipedia, wiki, book, books, library,
