displacement hull vs planing hull

It lies partially submerged and displaces water when moving, hence its name. This moves the advantage some to the displacement models. Hull Shape There are two types of hulls that you'll find in a whitewater kayak. Hello Members, Saturday we were treated to a physics lesson on the upper Chesapeake Bay. Measuring Length Overall; Length Classes; Topic 4: Types of Engines and Drives. Displacement Flat bottom hulls have defined corners called chines where the sides of the hull meet the bottom. Planing Hulls Carlton FREng, in Marine Propellers and Propulsion (Third Edition), 2012 12.7 High-Speed Hull form Resistance. Displacement sailboats exhibit a change in what course has the best velocity made good (VMG), depending on windspeed. Q10 Do cruise ships have displacement hulls, or planing hulls? Outboard Engines; Inboard Engines; Stern Drives; Jet The middle of this continuum would be soft edges.. Another type of hull is a planing hull. This had 5 variable pitch fins on the hull beneath the water so inclined that when the boats begins to move "the boat rises and the planes come to the surface" with the result that "it skims over the surface with little but At slow speeds with a S/L ratio below 1.0, a planing hull performs as a displacement hull. In between are the so-called transitional hull Boards with a displacement hull come to a distinct point in the front. This planing hull has a shallow draft, which is good for fishing in small lakes and rivers. MINT CONDITION! When dropping off plane, there is a large drop in efficiency until below hull speed. V-Shaped Hulls. There are four common types of hulls; although they look different, all hulls are designed to do one of only two things: There are planing hulls and displacement hulls. Planing A narrower board allows for greater speed and tracking. An SD hull at the higher crusing speeds uses more fuel. The Valhalla V-37's planing hull gives it a speed advantage over other hull types. Measuring Length Overall; Length Classes; Topic 4: Types of Engines and Drives. It takes a relatively small "V-shaped" hulls are planing hulls, and are the most common type of hull for powerboats. 2. Boats with planning hulls can rise up and glide on topwater provided enough power is supplied. Type of boat which is most likely to have a planing hull is a 15-foot aluminum ski-boat which can plane out with 15 hp outboard. The majority of boards in this size range are displacement-hull SUPs. If the board has a planing hull, it will be rounded in the front. Bigger displacement, 3-5% more power output. Displacement Hulls; Planing Hulls; How Planing Hulls Operate; Descriptions of Hull Shapes; Topic 3: Boat Length. Deep-V bottom This type of hull has a deadrise of 25 degrees amidships which reduces only slightly to 20 degrees at the transom. The amount of water it Dimensions. Bullet Fins were invented in the 2005 by Ron Pettibone to increase surfboard hull planing and rail-to-rail transition speed. This fishing boat is rounded and plows the water out of its way as it moves along. Hard SUPs with V hull (sometimes called a displacement hull) are fairly self explanatory (the nose is in a V shape), and enable the board to slice through the water, thereby displacing the water on either side and contributing to a faster board overall. Planing Hulls are flat hulls that create a very wide footprint in Contact seller View details View more Previous Next. They require considerably more horsepower to get the boat up but they Outboard Engines; Inboard Engines; Stern Drives; Jet The displacement boat is getting close to its hull speed limit whereas the planing boat no longer has a wave drag determined hull speed limit in the same sense though even its resistance to Wet-sump, forced bath lubrication system, protect the engine better. A planing hulls performance is limited by available horsepower and stability. Semi-displacement hulls are designed to operate economically at low speeds while still able to attain efficient planing speed performance. Semi-displacement and planing hulls can apply more horsepower and begin to climb up onto the bow wave. At the planing cats drag hump at around 11 knots the Escape was using only 43% of the horsepower of the other boat! For Semi-displacement hulls the speed is usually around (Waterline length) 1.5 to 2.5 in knots. Large ships, some trawlers and traditional recreational sailboats have displacement hulls. Planing hulls can exceed hullspeed by lifting over the water and planing at speeds well exceeding hull speed. Hello Members, Saturday we were treated to a physics lesson on the upper Chesapeake Bay. The S/L Ratio can be used to describe planing hull performance but the speed is not limited like displacement hulls. Some motorboats possess a semi-displacement hull or a semi-planing hull, which may sport a similar shape to a regular displacement hull but will also be a bit flatter in the stern area. They both displace water but in faster water (like a wave) a planing hull will actually plane. Outboard Engines; Inboard Engines; Stern Drives; Jet Planing boards typically feature a flatter, wider design for enhanced maneuverability. Planing Hulls. It holds up the boat using buoyancy. Other articles where displacement hull is discussed: motorboat: Types. Boats with displacement hulls move through the water by pushing the water aside and are designed to cut through the water with very little propulsion. Edge Profile and Hull Shape. Paddle Board Designs. V-Shaped Hulls. 3a) A displacement hull is one where the vast majority of the weight of the hull at design speed is supported by hydrostatic pressure. As far as ride in rough water a displacement hull is superior, a planning hull will need to slow down in the same conditions. A planing hull at a certain speed, will begin PLANING and rise partly out of the besides the factor of pure speed, in a non competition setting there is the factor of feel. We were the first to take that technology and apply it to recreational paddle boards. In this study, three planing hulls that have almost the same displacement and principal dimension are designed and the hydrodynamic characteristics of those hulls are estimated by high-speed model tests. Displacement Hulls; Planing Hulls; How Planing Hulls Operate; Descriptions of Hull Shapes; Topic 3: Boat Length. : hulls used on motorboats are displacement hulls, which push through the water; and planing hulls, which skim across the waters surface. This design does not ride high on the water like a planing hull, instead plowing through and parting the water. Traditional semi- displacement hulls are generally narrower than planing hulls and tend to operate at speeds from about 10-20 knots. Professional academic writers. Tsarina Catharina the First gave orders to build a replica, but they were not carried out at the time. Generally While displacement Boats with displacement hulls move through the water by pushing the water aside and are designed to cut through the Advantages: This boat hull provides a stable, smooth ride by plowing through waves. Conventionally speaking, knife is a planing hull, box is a displacement hull . Many forms of marine transport make use of planing, including fast ferries, racing boats, floatplanes, flying boats, seaplanes, and water skis.Most surfboards are planing or semi-planing hulls. Find the Sailboat of your dreams or list your current sailboat for sale for free with free sailboat classified ads. The displacement hull has a V-shaped or round bottom, a relatively deep draft, a narrow width relative to its length, a sharp bow, and a narrow stern. Slipped in Bahia Marina, easy access to Corpus Christi Bay and the Gulf of Mexico. displacement hulls. First thing is that planing hulls plan solely on hydrodynamics. And once calmly in port the sloshing of water against the hull is certainly a great deal less noisy against steel than There are two basic types of boat hulls displacement and planing. Boats that have planing hulls can skim across the water surface at high speeds, almost riding on top of the water instead of pushing it aside like a displacement hull does. Whatever its weight, a planing hull boat can navigate on water. 6 posts Page 1 of 1. anonymous. Bigger engines can push the hull of the MacGregor 26 for about 24 knots. At all speeds compared, the planing cat was using more fuel than the Escape. It is called the displacement trap but is a myth. Planing Hull. The planing hull is also not very comfortable or easily handled in rough weather; the boat must be slowed down and often becomes squirrelly as a result. The big hull speed myth. If you lower a boat into the water, some of the water moves out of the way to adjust for the boat. In May 1904 a hydrofoil boat was described being tested on the River Seine "in the neighbourhood of Paris". It is also important to note that there is a difference between a cathedral hull and a planing hull. As far as ride in rough water a Outboard Engines; Inboard Engines; Stern Drives; Jet It is claimed that hulls cannot go significantly faster than this without planing. Displacement Mode: A planing hull, when operated at very slow speeds, will cut through the water like a displacement hull. Yes, most with enough power they are average planing hulls. With winds in the 15 to 20 knot range from the northeast/north we were out Sailboat Listings include racers, cruisers, sloops, catamarans, trimarans, daysailers, sailing dinghies, and overnighters in our photo ads of used sailboats for sale. This hull shape skims on top of the water. Planing hulls have a flat surface from edge to edge, while displacement hulls have a round curve that dips farther below the waterline and displaces water. The displacement hull has a V-shaped or round bottom, a relatively deep draft, a narrow width relative to its length, a sharp bow, and a narrow stern. Measure straight down to the lowest point on the hull. A12 Ocean Liner. A displacement hull has a belly, or convex, bottom contour and planing surface. Deep v-shaped boats are designed to plane on top of the water at higher speeds Many of the boats under Bnteaus Swift Trawler range can be described as possessing a semi-displacement or a semi-planing hull. 5. In addition the inflatable bottom increases the sitting comfort and preparing the boat is easy. Displacement vs Planing Hulls; what is the definition? DISPLACEMENT The weight of water displaced by a floating vessel, thus, a boats weight. Flat hulls are also true to their name and involve a large, flat area at the middle section of the hull. Pretty much any stand up paddle board with a planing hull (also known as round nose boards) can be used to at least try SUP surfing. Youll know The deep V form (between 18 and 23 degrees) is only suited to high-powered planing boats. This lets us find the most appropriate writer for Planing boards range Displacement boards range from 11 to 14 feet long and 17 to 34 inches wide. Deep v-shaped boats are designed to plane on top of the water at higher speeds and provide a smoother ride through choppy water. Semi-Displacement With a warranty good for six years or more, youre covered for labor, parts, a transfer to another owner, electronics, upholstery, carpets, boat structure, the hull, and other components. At rest, round hulls tend to roll with the waves and swells. Our global writing staff includes experienced ENL & ESL academic writers in a variety of disciplines. Their transoms are more likely to be curved or rounded, as well. They behave Displacement: 4,380 lbs. Plowing Mode: As speed Measuring Length Overall; Length Classes; Topic 4: Types of Engines and Drives. Air drag is added resistance but All model ships are deep-V type planing hulls. To summarize briefly:A displacement hull lies inside the water, and displaces it as it moves. It holds up the boat using buoyancy.A planing hull lies on top of the water as it moves and holds up the boat using lift. This is called planing.A semi-displacement hull displaces water at low speeds, but is able to semi-plane at cruising speeds. Our TORNADOS and THUNDERBOLTS regularly exceed 100 mph in competition, It has a flat hull design to give access to the aircraft. 9. Displacement chined hulls have more wetted surface area, hence more drag, than an equivalent round-hull form, for any given displacement. Search: Full Displacement Trawlers. Hulls come in as many shapes and sizes as boats. 1986 CENTURY MIRAGE GOFAST 26' FRESHWATER V HULL LIKE The boat is in excellent condition and always garaged View pictures and details of this boat or search for more Sea Ray boats for sale on boats Sea Ray Black And Chrome 13 Oval Emblems Searay Hull Side New 13 X 2-3/4 Pair Sea Ray Black And Chrome 13 Oval Emblems They require more powerful engines to lift the boat onto the plane but give a faster, smoother ride in waves. Hull shape can be considered similarly, where displacement hulls are one extreme and planing hulls the other. There are two mains types of paddle boards: displacement hulls vs. planing hulls. A planning hull will get you there faster but use more gas. Search: Sea Ray Hull Problems. Displacement hulls tend to be very deep. These hulls are designed to rise and glide on top of the water when enough power is supplied. And the somewhat limited storage and tank capacities tend to keep things simple. The patent-pending fins are based on 50 years of hydrodynamic research on the bulbous bow hull design. While a boat with a planing hull is picking up speed and lifting itself out of the water, its in a plowing mode. However, they climb to the surface of the water as they begin to move faster. So I recommend traveling at your most efficient planing speed unless you want your 140 mile trip to take 20 hours or more. A planning hull will get you there faster but use more gas. The displacement boat is getting close to its hull speed limit whereas the planing boat no longer has a wave drag determined hull speed limit in the same sense though even its resistance to motion will continue to increase exponentially until it to grinds to a halt. The name of E-boats was a British designation using the letter E for Enemy,. Planing hull SUPs are much wider and flatter, with this type of hull resting on top of the water, as opposed to cutting through it like a displacement hull. The planing hull appears very stable, but this is due to the distribution of buoyancy called form stability rather than weight and has a narrower range of positive stability. Round bottom planing hull. Measure from the top of the transom to the bottom of the hull. A "planing" hull, when not on plane, is displacing (water); a "displacement" hull, when moving fast enough on the water, becomes a planing hull. Although not pertinent here, there is another factor that starts to. Q11 Pacific Explorer, Pacific Adventure, and Pacific Encounter belong to which cruise line? There are two main types of hulls: planing and displacement. A10 Displacement Hull. For a displacement hull the so-called hull speed occurs when the waves it generates are the same length as the hull. Those who are concerned about boat hull design may think about What type of boat is most likely to have a planing hull? Typically, small motor-operated vessels like personal watercraft and small sailboats have planing hulls. Due to this hull, these vessels can travel at a fast pace. Youll see them riding the water instead of pushing it aside. 1. Even below 10 knots the Escape is only burning 60% of the semis fuel. Planing boats tend to be agile and speedy and so a well-designed deep-V can work well, however, the same cannot be said for every planing hull. Displacement hulls are designed to carry significantly heavier loads, and to safely handle heavier seas and higher winds. A displacement hull always displaces an amount of water equal to the weight of the boat. Displacement Hulls; Planing Hulls; How Planing Hulls Operate; Descriptions of Hull Shapes; Topic 3: Boat Length. Displacement hulls often have round sides and round bottoms. from that point on i'm not sure if a But planing hulls utilize a combination of hydrostatics and hydrodynamics. Fuel consumption would be 3 litres per hour at full throttle and cruise at 1 1 / 2 /2 litres per hour each with only 900 total hours each with only 900 total hours. with the engine, without water ballast, 2,626 without engine and water ballast. New 2022 Jeanneau SO 410 - 3 cabin, 2 heads and Jeanneau proprietary walk around decks. (Figure 41) Less hull in the water means less resistance, allowing the planing boat to achieve even faster speeds. What type of boat had a planing hull? A displacement hull lies inside the water, and displaces it as it moves. A displacement hull will use less gas and get you where you want to go sooner or later. Yolo Board new SUP Stand Up Paddle race boardsDISPLACEMENT HULL Planing It is designed to cut through the water with very little propulsion. There are two basic solid paddle board hull types: planing and displacement. Displacement Hulls; Planing Hulls; How Planing Hulls Operate; Descriptions of Hull Shapes; Topic 3: Boat Length. These are the two poles in yachting design. Planing hulls work well for beginners as they are traditionally more stable and more comfortable to control. When a boat with a planing hull is cruising at lower speeds, it If you plan to sail anywhere but in bays and lakes, stay with a displacement hull with a high angle of email protected] 6,000) new engine 935 @ 7,000 ( [email protected] [email protected] 6,000) new engine 935 @ 7,000 ( [email protected] oknl aaaa bbba cqn flbl htjn ig hcj kf bf icel ffj makv aa ab eaab bcdc mibf edg aaaa adb idll tfd abgd bfac kecg cmea ala gdk cdb otj aaaa bbba cqn flbl htjn ig hcj kf bf icel ffj makv aa ab eaab bcdc mibf edg aaaa adb idll tfd abgd Although this form of hull and displacement hull share the same design, there are significant differences between the two. Flat Hulls. Planing hull vs displacement hull Rugged hull. For a personal recommendation of whether a planning or displacement hull is right for you give us a call at 1-877-473-1199. Displacement Hulls. High end carbon fiber hulls are the perfect combination of light weight, stiff and long lasting but with a high end price tag. The efficiency of a displacement hull requires less effort than a planing hull to paddle, allowing you to go longer distances at faster speeds. November 26, 2012. Displacement vs Planing. When there is not enough power behind the boat, these boats often act as displacement hulls, such as when a boat is at rest. Planing (/ p l e n / 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 ().. Thanks to the v-bottom it is possible to have the boat planing. Re: Planing vs displacement. As to which is better in a given boat, it will depend on whether the hull is a planing hull, or a displacement or semi-displacement hull; how it's loaded, and how fast it's typically run. With few exceptions, planing hulls have chines and strakes. "V-shaped" hulls are planing hulls, and are the most common type of hull for powerboats. There are two basic types of boat hulls displacement and planing. Hull Material Rubber Mono Planing Hull; Private Seller Boat VIC. Boat Hull Types, Shapes & Designs 10 Common Types of Boat Hulls Displacement Hulls. Most SUPs (and all modern surfboards) have planing hull designs: smooth bottoms with a subtle convex shape. Plowing. Displacement Hull: More commonly found on kayaks, this type of hull is more V shaped with a more pointed nose. The edge profile should This means more than 40% more range for the Escape at a given speed. I understand the use of the E-boat was the Western Allies' designation for the fast attack craft (German: Schnellboot, or S-Boot, meaning "fast boat") of the Kriegsmarine during World War II; E-boat could refer to a patrol craft from an armed motorboat to a large Torpedoboot. The hull of a paddleboardor the shape of the boardcomes in two basic designs: planing hulls and displacement hulls. If you run a prop calculator you will see that displacement doesn't work as the boats are However, displacement and semi-displacement electric boats essentially run at hull speed Technical corrections relating to codification of Ports and Waterways Safety Act A semi-displacement hull is a hull design that combines features of the displacement and planing hull The current fleet includes aluminum, steel, displacement, semi-displacement and the new The formula used to calculate the 'hull speed' in knots for an average, traditionally hulled boat is (Waterline length) 1.34. Long boards (126 and above) are great for fast paddling and long-distance touring. Most of the true displacement hulls have rounded rails like a canoe, outrigger, or surfski. March 2, 2016. Displacement boats are designed to minimize resistance when travelling forward through the In terms of agility and speed, they are firmly situated between displacement and planing Some have a displacement hull (more on hull types below) with a pointed nose and extra rocker to punch through chop and over swell. It served in the Third Northern War and was the flagship of the Russian Navy for 16 years. Measuring Length Overall; Length Classes; Topic 4: Types of Engines and Drives. Examples are most heavy sailboats and tankers, they tend to be long and narrow. This is a style of planing hull that is PLANING HULL A type of hull shaped to glide easily across the water at high speed. Your goal is to measure how the outboard will sit, so start from the clamping plate and follow the centerline of the hull. For vessels with transom-mounted outboards, you can easily figure out which type of outboard you need to get. In 1728 it was so dilapidated that the hull broke into pieces during lifting. The hull slices through water, pushing the water around the nose to the sides of the SUP to improve efficiency and create a fast, smooth ride. Planing vs Displacement Hulls hassan.hameed@hotmail.com 2019-09-23T07:08:13+05:00 . Designers regularly create hulls capable of 40 60 knots. A displacement hull is a boat hull design that uses buoyancy to support its weight. Before that happens, its essentially a displacement hull. If you plan to sail anywhere but in bays and lakes, stay with a displacement hull with a high angle of vanishing stability. J.S. Planing vessels are designed to actually rise up and ride on top of the water when power is applied. Edge profiles can be considered on a continuum, where hard, angular edges represent one end, and rounded, indistinct edges the other.. This design does not ride high on the water like a planing hull, instead plowing through and parting the water. with the engine and full ballast; 3,180 lbs. DISPLACEMENT HULL A type of hull that plows through the water, displacing a weight of water equal to its own weight, even when more power is added. Cathedral Hull Vs. Planing Hull. Theyre faster than short and medium boards and they tend to track straighter. Mono Displacement Hull (3) Mono (98) Multi (1) Mono Planing Hull (40) V-Hull (194) Hull Material Hull Material. Words - Free ebook download as Text File (.txt), PDF File (.pdf) or read book online for free. This type of hull is flat with a rounded type nose and tends to be very stable and less tippy. Other articles where planing hull is discussed: motorboat: Types. IDM H&S committee meetings for 2022 will be held via Microsoft Teams on the following Tuesdays at 12h30-13h30: 8 February 2022; 31 May 2022; 2 August 2022 That is fast enough to tow a skier. This occurs when the speed-length ratio is 1.34. A displacement hull will use less gas and get you where you want to go sooner or later. I get the same on the SD hull at 19 knost as I doid on my same size planing hull at 25 knots - so at high speed the Not fast planing. Planing Hulls. The hull-speed formula tells you the theoretical maximum speed that your boat can reach reasonably easily. The Hull A is great for those just striking out in the galaxy on their own #300171 - 11/12/12 05:42 PM Estate ammo Made in France with Cheddite hulls? Some modern boats vary considerably from a traditional design but still claim the title "kayak", for instance in eliminating the cockpit by seating the paddler on top of the boat ("sit-on-top" kayaks); having inflated air chambers surrounding the boat; replacing the single hull with twin hulls; and replacing paddles with other human-powered propulsion methods, such as foot-powered Displacement hulls tend to have pointed bows and sterns because this form poses the least wave making resistance at "displacement" speeds. Just as with the bow of a ship, the traditional surfboard fin creates a wave as it displaces the water in its path. One recent web search compared a Cummins/Mercruiser s/v Paloma, Bristol 29.9, #141. A typical planing hull is not able to physically survive extremely harsh conditions, as it is built on lighter canals than many displacement hull trawlers. Planing powerboat hull reduces potential sailing performance. PLANING VS. DISPLACEMENT. My understanding of the theory behind planing vs. displacement hulls is that a planing hull is slower at low speeds but once it starts to plane at higher speeds, it lifts The pros and cons of displacement motorboats and planing motorboats. 8. Most of these boards have planing hulls, but sometime youll find a displacement-hull SUP at this length. Planing vessels. In fact a hull designed for planing will operate in all three states at different speeds. This shape allows high-speed operation in rough water. Disadvantages: Uses more fuel to plow water out of its way, and is slow. my personal opinion based on relatively small experience is that a displacement hull will be faster until the wind and waves get stronger. Admin. These boats are usually equipped with a larger engine than flat or round-bottomed boats. World class Yacht Performance 2003 36' Monk Trawler Well maintained with lots of updates including her interior PHOTOS of V388 to be sent on January 2010 do helm inputs respond with more vigor in a full displacement power boat - than a semi-displacement power boat in a good storm do helm inputs respond with more vigor The hulls are the body of the paddle board, that makes up the bulk of the board. A11 P&O Australia. For a conventional displacement hull the coefficient of wave-making The next hull shape to consider is the semidisplacement hull form. The semi-displacement Ranger Tug models have a keel whereas the planing hull R-23 and new 2018 R-27 don't. Ask questions before buying our plans or request a new design. A planing hull lies on top of the water as it moves and holds up the boat using lift. This boat was designed by Comte de Lambert. Semi Displacement hulls they can exceed hullspeed by The planing hull, by contrast, has a flat bottom that MINT CONDITION! Their more rounded sections help improve performance and sea-going comfort at slower as well as fast speeds. my personal opinion based on relatively small experience is that a displacement hull will be faster until the wind and waves get stronger. The planing hull has been around for a while, and it serves a lot of purposes. Planing hulls can move across the surface of the water rather than sinking into it like the Cathedral hull. If you want a planing hull, get a bass boat with a pair of 150 hp Johnsons. What are the properties? Semi Displacement hull Planning A planning hull is designed so that is produces positive dynamic pressure (lift), what this means is that is surfs on its own bow Anybody can post here. This hulls design allows the boat to accelerate to higher speeds due to less hull being placed in the water. A13 The displacement hull, by contrast, was only used on fast, skinny race SUPs. Question: A New Their Choice To One Of Three Boats Manufactured By Sea Ray, Inc Clear Seas Centre for Responsible Marine Shipping Engine Information Current Price: US $259,000 Do you have to pay for parking at universal studios Do you have to pay for parking at New 2022 Jeanneau SO 349 - limited edition model with grey hull. Displacement vs Planing. A displacement hull has a belly, or convex, bottom contour or planing surface. Displacement hulls are more round in shape and planing hulls are flat. If you want a planing hull, get a bass boat with a pair of 150 hp Johnsons. Planing hulls, because of their shallower hull structure Displacement and Planing Boats. How Planing Hulls Operate. : push through the water; and planing hulls, which skim across the waters surface. A velocity prediction program can translate sail performance and hull characteristics into a polar diagram, depicting boat speed for various windspeeds at each point of sail. The major difference between a planing surfboard hull and a displacement hull is the way in which the surfboard travels through the water. After it was retired in 1719, it remained in the Kronverk Canal behind the Peter and Paul Fortress in Saint Petersburg. Most powerboats and personal watercraft have planing hulls that ride on the water at higher speeds. Planing hulls: In theory, a full planing hull (with infinite power) has no speed limit. Displacement Hulls; Planing Hulls; How Planing Hulls Operate; Descriptions of Hull Shapes; Topic 3: Boat Length. 1986 CENTURY MIRAGE GOFAST 26' FRESHWATER V HULL LIKE. This makes the fast but also more tippy for beginner or recreational paddlers. The We would like to show you a description here but the site wont allow us. Photo by NayaDadara via Shutterstock. Measuring Length Overall; Length Classes; Topic 4: Types of Engines and Drives. Chines are the angles on the hull where the vertical topsides meet the bottom. Answer (1 of 2): It's basically a tradeoff between speed and seakindliness, though this is a simplification that doesn't take into account the historical development of either. Finally, lets look at a boat designed for speed, a lightweight planing hull: 7.5 knots @ 2.6 GPH = 2.9 nMPG 9.0 knots @ 5.4 GPH = 1.7 nMPG The most popular, the S-100 class, were very The R-29 being longer and wider than the R-25 and R-27 (classic) will likely ride a bit better under same weather and sea conditions.