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At low speeds these hulls ride and handle similarly to a comparable V-hull; but at high speeds the padded hull can both out-accelerate and have a higher top speed than a similarly powered V-hull. Piloting a padded V-hull requires considerable skill, since at high speed the hull is riding upon a small
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to provide strength where the chines joined. Beams are then attached to the chine log to support planks running parallel to the chine, while cross-planked sections such as a typical scow bottom may be attached directly to the chine log. This method of construction originated with the sailing scow
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A chined hull built out of plywood will often be designed to keep most of the lengthwise joints between the plywood sheets at the chines, thus making the building process easier. While chine logs (often just called chines) can be used for plywood boats, another common technique replaces the chine
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The three-chine hull (C) is probably the most common hard-chine hull. Having a shallow "V" in the bottom and near-vertical panels above that, it approximates the shape of traditional rounded-hull boats fairly well. This hull is common, even in fiberglass designs where employing chines offers no
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Chine log construction works best for hulls where the sides join a flat bottom at a right angle, but it can be used for other angles as well with an appropriately angled chine log. Builders of small boats such as punts, where the plank thickness is large compared to the size of the hull, can
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The simplest type of chine construction is the single-chine "V" shape, with two flat panels joined at the keel (A). This type of hull is among the simplest to build, but they lack stability on a narrow "V" and may lack freeboard on a wide "V". Single-chine hulls are generally only seen on
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pad. The driver must make slight, accurate steering inputs to maintain level progress, as otherwise padded V-hulls tend to "chine-walk". As speeds increase, chine-walk becomes more pronounced and may lead to loss of control unless the driver is able to compensate for it.
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in storms. As long as it sailed in the protected inland and coastal waters it was designed to operate in, however, the sailing scow was an efficient and cost-effective solution to transporting goods from inland sources to the coast. A good example of this is the
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and nearly vertical sides, was the first hard-chine design to achieve widespread use. This design provides far more stability than the single-chine hull, with minimum draft and a large cargo capacity. These characteristics make the two-chine hull popular for
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Traditional planked hulls in most cultures are built by placing wooden planks oriented parallel to the waterflow and attached to bent wooden frames. This also produced a rounded hull, generally with a sharp bottom edge to form the
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more efficiently due to very low deadrise planing surface (compared to the vee hull lifting surfaces). This highly efficient lift helps to unwet the less efficient V-section's hull, thereby dramatically reducing
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Using sheet materials in boat construction is cheap and simple, but whereas these sheet materials are flexible longitudinally, they tend to be rigid vertically. Examples of steel vessels with hard chines include
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It is possible to refer to the different hulls by the numbers of the flat panels that make up the boat. Thus A is a two-panel boat, B is a three-panel boat, C is a four-panel boat and D is an eight-panel boat.
277:, was the first significant example of a hard-chine sailing vessel. While sailing scows had a poor safety reputation, that was due more to their typical cheap construction and tendency to
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which then segues into a flat area typically 0.15 metres (5.9 in) to 0.25 metres (9.8 in) wide. This flat area at the rear is the "pad", and is said to provide
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is one of the simplest hard-chine small boats. Consisting usually of a single plank for each side, with a square bow and stern, the punt was in essence a tiny scow.
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The first hulls to start incorporating hard chines were probably shallow-draft cargo-carrying vessels used on rivers and in
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hulls, are also common. By increasing the number of chines, the hull can very closely approximate a round-bottomed hull.
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joint that provides both connection and stiffness to the joint; this method is most commonly called
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Note: Chine-walk is when the boat rocks side to side on the rear portion of the hull. See:
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dispense with the chine log and nail intersecting planks directly into one another.
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Once sufficiently powerful marine motors had been developed to allow powerboats to
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The
Philosophy of Shipbuilding: Conceptual Approaches to the Study of Wooden Ships
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614:"A Walk on the Wild Side. Chine Walking – why it happens and how to fix it"
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is a method of building hard-chine boat hulls. Hard chines are common in
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would be more rounded, but still involve the meeting of distinct planes.
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at speed on calm water showing its hard-chine hull. Note how most of the
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Working in the same inland waters as the sailing scows was the later
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Sharp angle in boat hull cross-sections used for ease of construction
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and continues to be used today, primarily in home built boats.
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S-bottom hull (A), compared to a hard (B) and soft (C) chine hull
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Wisconsin's
Maritime Trails – Notes From the Field Journal Entry
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sailboats, which often use two deep V-shaped hulls connected by
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224:. Planked boats were built in this manner for most of history.
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Plank hulls use wooden supports placed along the chines called
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Designs with higher numbers of chines (D), often just called
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A padded V-hull is a hull shape found on both pure
49:. Unsourced material may be challenged and removed.
494:. Texas A&M University Press. pp. 156–.
125:in boat design is a sharp change in angle in the
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669:Chine Walk in Performance Hulls by Jim Russell
545:The Last Penacook: A Tale of Provincial Times
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488:Frederick M. Hocker; Cheryl A. Ward (2004).
212:hulls, while soft chines are often found on
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521:. McGraw Hill Professional. pp. 40–.
200:is an angle with little rounding, where a
109:Learn how and when to remove this message
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273:in particular, in the form of the scow
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659:Hull Technology in Hydrostream Boats
47:adding citations to reliable sources
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518:Sorensen's Guide to Powerboats, 2/E
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664:Vee Pad Hull Design by Jim Russell
515:Eric Sorensen (22 November 2007).
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371:Two planks joined by a chine log
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181:Hulls without chines (such as
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325:to provide mutual stability.
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425:and standard recreational
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189:vessels) usually have a
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699:Engineering concepts
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58:"Chine" boating
43:improve this article
145:Rationale of chines
694:Naval architecture
586:2006-05-13 at the
568:2006-08-25 at the
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255:motor torpedo boat
242:Boats using chines
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563:Samson specs page
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62:news
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45:by
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