A key factor to understand is “deadrise.” Deadrise is a measurement of the degree of angle between two surfaces. A boat’s deadrise is the amount of angle that forms between the boat bottom and a horizontal plane on either side of center keel. All Southport hulls carry a 22 degree deadrise angle at the transom – 46 degrees at the bow, whereas a typical flats boat, for this example, might carry just 8 degrees of deadrise, or have a completely flat bottom is some cases (like certain “skiff” boats). Delivery options and delivery speeds may vary for different locations. This makes flat-bottom hulls perfect for calm inland waters such as rivers and small lakes. Fitted with our Hybrid FAST foam/air collar system, using a combination of 80% foam and 20% air, these collars will always provide a safe platform while still providing the look and feel of a true inflatable. Most of the data is for the unappended hull. Regulator 34 At the bow, Regulators feature as much as 54 degrees of deadrise. CHIRPs from 95-155kHz to provide 60kHz of total bandwidth from one transducer. Contender Boats debuted its largest boat yet, the 44ST at the Miami show. This makes flat-bottom hulls perfect for calm inland waters such as rivers and small lakes. All Rights Reserved. A mod-V design has a steeper deadrise at the bow that modifies to a lower deadrise toward the stern. On 20-22 foot center console glass boats, I mostly see a 20 degree deadrise which is called a modified deep V, which is a good compromise. Hull designs are a carefully engineered balance of performance, speed, stability, handling, fuel economy and comfort. Understanding how a hull’s shape is constructed is a critical factor in selecting the boat that will best fit your needs. Some naval architects say a small boat needs at least 21 degrees of transom deadrise to qualify as a deep vee hull. The deeper draft generates drag, so boats with a deep-V hull usually need more powerful, A flat-bottom hull also has a shallow draft, so the boat can navigate shallow waters of 10-inches or less. If you want a fast RIB with unmatched performance this is for you. Flat-bottom hulls are rarely completely flat, but the minimal deadrise provides a particularly stable platform with very little roll in calm waters. The 19 degree deadrise hull utilizes a pad and full running strakes that are quite deep. Prospective boat buyers often concentrate on the length and width, and the cockpit and console layout, but tend to overlook the importance of the boat's hull type. Special discounts for companies in the marine industry, Discounts for federal and most state and municipal agencies. Models, specifications, features, and options are subject to change without notice as Weldcraft seeks product improvements. However, if you’ll be using your boat predominantly on shallow inland waters, the flat-bottom hull may be your best option. All rights reserved | Site Design: Some photos show models with dealer added options. Personal Floatation Devices (PFDs) not always visible in photos. As a result, deep-V hulls provide better tracking and a smoother ride in rougher waters. The steeper the deadrise, the better the hull can be expected to slice through waves. Models, specifications, features, and options are subject to change without notice as Weldcraft seeks product improvements. Download Brochure | Weldcraft ApparelSome photos show models with dealer added options. Bay boats often have a moderate deadrise angle, sometimes with chines.The chines serve the same purpose on these hulls as on deep V hulls, but aren't needed as much because the form of the hull makes it more stable, shallower draft, etc. The deadrise angle is the least (meaning flattest) at the transom and gradually increases (more vee) as the bottom goes forward and then increases at a greater rate at the bow. Feb 24, 2006 #6 Re: Deadrise Degree: 21 vs 19 = best performance? If the OP is referring to the off-set of the transducer when installed in his hull, it sounds like there's enough variability between a 12 degree and a 20 degree to take his 19 degree hull (deadrise) … With an LOA of 43 feet, 10 inches, the new center console carries a maximum horsepower rating of 2,000 ponies to push a sharp-entry, 24½-degree-transom-deadrise hull. The reduced draft toward the stern also enables a mod-V hull to traverse shallow waters. (Some builders don’t publish the deadrise angle at the transom because they don’t want to get into the debate about which angle is best.) This 22-26ft aluminum hulled RIB class of boats will change the way you look at inflatables. These boats, which are often ballasted to increase their range of stability to 90 degrees or more, use very little fuel when run well below their full-displacement speed. Copyright 2021 © Weldcraft Marine. The deeper draft generates drag, so boats with a deep-V hull usually need more powerful outboard motors to reach top speed. A boat that cuts through big waves smoothly, may not be a dry boat. © 2000-2021 Boats.net. Straight course and rotating arm tests were conducted at three speeds Cv = 1.5, 3.0, and 4.01, three angular velocities LIR = 0, 0.117, and 0.234 and a single beam loading Cv = 0.4375. Tilted element inside the transducer accommodates all hull deadrises and eliminates the need for a fairing block. If you know you’ll be running almost exclusively offshore and at speed, then a deep-V hull is probably the way to go. Look for unique “deadrise defined” measurements clearly listed for every model throughout our brochures and websites. I have a 21 Pulsare, the boat tracks incredibly well and handles great. That is, the angle of the bottom is shaped like a … The Centurion Opti-V hull, which is a Centurion exclusive design, displaces more water with less weight and creates a smooth rough-water ride thanks to the 20 degree of deadrise at the transom. Grady-White’s SeaV² hull shape continuously sharpens from the transom to the bow, ranging from under 20 degrees deadrise at the stern to a sea-cutting 30 degrees or so amidships, then reaching a wave-slicing 50-plus degrees at the bow. The mod-V hull combines the positive elements of the deep-V and the flat-bottom hulls. The hull is wood and about 7/8 inch thick. Airmar B75Hw/20° Tilt600WFlush-mounted bronze housing,tilted element inside the transducer accommodates all hull deadrises and eliminates the need for a fairing block. Uncompromising deep vee hull (20 degree deadrise). Due to their versatility, mod-V hulls are common among family and recreational boats. Generally speaking, deadrise is an indicator of a boat’s capability to handle rough water, shallow water, overall performance and the softness of the ride. A boat with “a lot of deadrise” is a boat with a deeper, sharper V-shaped hull. Please check with your local Weldcraft dealer for the latest information about all of the features and options available for your Weldcraft boat. The deadrise at the transom is significant because, on a planing hull, only the aft end is consistently in the water. Also at the transom, triangular pads on each corner of the running surface. I personally would opt for the higher deadrise. The drawbacks to a deep-V hull are the added draft (the depth the hull reaches below the waterline) and reduced stability at slow speeds. Deadrise Angle: 0 to 20 Degree: Frequency: 95/155kHz: Material: Bronze: Maximum Depth: 1500 Feet: Sonar: Depth: Transmit Power: 300 Watts: Type: Thru-Hull: Product Overview . It affects your punishment level.....i.e. As a result, deep-V hulls provide better tracking and a smoother ride in rougher waters. Low, medium, and high frequency versions provide maximum flexibility for the choice of frequencies. Moderate Deadrise. Most manufacturers list only a single deadrise measurement. At 7.80 metres overall, with an aggressive 20 degree deadrise and 6mm hull the XP776 makes light work of the roughest conditions. A flat-bottom hull also has a shallow draft, so the boat can navigate shallow waters of 10-inches or less. A boat’s deadrise is the amount of angle that forms between the boat bottom and a horizontal plane on either side of center keel. Essentially what that correction says is that with those strakes, the 22deg hull produces the same amount of lift as a 20.35deg hull without strakes. Before choosing a hull type, it’s important to understand deadrise: the angle in degrees between a horizontal plane and the bottom of the hull. They are specialized to provide optimal performance in varying water conditions. They make a smaller 20 bowrider and an 18 called the 1850 BR but they don't come in closed bow versions anymore and are not quite as capable. Deep-V hull: 20 degrees deadrise and above; Mod-V hull:10-20 degrees deadrise; Flat-bottom hull: 10 degrees deadrise and below; Deep-V Hull Type. Thanks to Southern’s alloy trailer technology the XP776 is still well within legal towing requirements at only 2200kg (approx) on the road. For use with 5x7xs, 7x1xs, echoMAP 50dv, 70dv, 800xs Series, 1000xs Series and GSD 24. A SeaV² hull with 20 degrees of deadrise at the transom will have around 30 degrees amidships—more than even the most radical older deep vee designs. However, in the past, when Regulator built a 21-footer, he employed a 20-degree deadrise, “and would consider something less [than 24 degrees] if the size of the line expands.” … continued on next image. The hull design is flared with the beam 96 inches. The deeper vee forward means a softer ride at sea. Airmar B175Mw/20° Tilt1kWFlush-mounted bronze housing protrudes less than 1/4" outside hull and can sit on trailer rollers/bunks without damage. This can be very misleading as the exact point at which the measurement is taken can vary dramatically from model to model. Deep-V hull: 20 degrees deadrise and above, Flat-bottom hull: 10 degrees deadrise and below, As a result, deep-V hulls provide better tracking and a smoother ride in rougher waters. Personal Floatation Devices (PFDs) not always visible in photos. Available in open hardtop and enclosed wheelhouse configurations. The deadise is 18 and 20 respectively. 20˚DEADRISEOPTI-V HULL 5. Some of the best wave busters are as sharp as 24.5 degrees. The deadrise angle typically determines the hull type as follows: The deep-V hull has a lot of deadrise, and the resulting sharp profile cuts through chop and waves instead of slamming into them. Occassionally, a manufacturer will only provide the highest (steepest) deadrise measurement, which most often occurs at the furthest point forward on the bow. The deeper vee forward means a softer ride at sea. A 96,000-pound Krogen 58 (52 feet LWL), drawing more than 6 feet and powered with twin 158-hp diesels, gets 2.4 nmpg running at a speed length ratio (s/l) of 1 (7.2 knots). That deeper vee forward means a … On the other hand a higher deadrise hull will rock a bit more at drift, assuming you have enough wave action to move it in the first place. REW brings up a good point. Weldcraft908 Port DriveClarkston, WA 99403, 800-597-9189 (toll free)509-758-9189 (local)info@weldcraft.com. The weight is almost twice that of a given tin boat, that being about 2700 lbs. Deep-V hulls are the best for offshore use or rougher waters. The deep-V hull has a lot of deadrise, and the resulting sharp profile cuts through chop and waves instead of slamming into them.