Tow boat hull design calculations,boats for sale in palestine texas obituaries,boat dealers in lapeer michigan zip code - Videos Download

Published 05.03.2016 | Author : admin | Category : Diy Sailboat Plans

Location: Louisiana I was wondering why the builder would not have opted to round off the tunnels.
Location: Sweden It's the longitudinal shape that really matters, since this is guiding the flow into the propeller. When making potentially dangerous or financial decisions, always employ and consult appropriate professionals.
Mod V refers to a one-piece hull with a modified V shape up front that transitions to a flatter V at the rear. Deep V hulls feature a sharp V-shaped design with up to a 35-degree deadrise at the bow and up to 20 degrees at the transom.
NO HAGGLE NO HASSLE® Value Prices are shown in US dollars only and initially displayed without dealer prep and freight charges.
Boats, like cars, often feature a shape that defines them, that makes their purpose expressly obvious. But hull shapes also carry subtler messages that help boat buyers home in on just the right choice for their fishing style.
Factors besides hull shape obviously enter the above equations, and Roop is quick to point out that no single design element determines the overall package. As designers increase the angle of the hull to form a V, they see the vessel’s rough-water ride improve.
A final category is the variable-deadrise hull, wherein the lowest or deepest section of the hull forms a steep angle, and each subsequent section between the longitudinal strakes (the ridges that run fore and aft) angles less and less. With some moderate- and deep-V vessels, the deadrise remains more or less constant from amidships to the transom, though it narrows at the bow.
Chines and the adjacent flat surfaces redirect spray to the side and create lift, Codega says.
Some companies take deep-V’s to another level, ­specifically those builders that make offshore-tournament center-consoles. Builders also play with the proportion between chine width (wider chines increase stability at rest), the pad design, and the step size and angle.
Steps introduce air, which reduces friction for better efficiency and speed — 25 percent to 30 percent better fuel economy and 15 percent increased speed, Nagler says. Most bay boats and flats skiffs feature deadrise angles in the teens; 15 degrees is a fairly typical starting point. 38' Aluminum Landing Craft -- This boat started out as a 26’ landing craft, but was widened and lengthened to suit the owner’s expanding business.
30' Steel Towboat --  A twin screw, shallow draft workboat with push knees, this tow boat features a unique hull design allowing large diameter props and excellent stability.
This would be an 8 to ten meter, outboard powered, fast tender, towed at 10 to 14 knots, all weather. I suggested a classic hull with a fine bow entry, sharp vee forward , a flat run aft and a keel or bilge keels for directional stability when towed at 10 knots. Location: Eustis, FL Not much of a mega yacht if you have tow a 30'er is it.
Location: California What would be a reason to tow a tender other than a rare circumstance?

To answer the question, I don't like fine entries for towing because it may cause bow steering and wander.
Location: South Florida USA That may true (fuel burn) be for the globe trotting mega types but for the Island Hoppers around here and the Caribbean that's not the case. Location: Milwaukee, WI The problem with a hull like that is that it can overtake the tow vessel, particularly running.
Location: Eustis, FL I would think something along the lines of a lifeboat hull, with fuller after sections and big, heavily crowned fore and aft decks, for the inevitable roll over. For that example at least rounded tunnels would be more expensive to build with little added benefit.
Designed for serious anglers who know performance, the aggressive V profile of the bow gives you the smoothest, fastest ride to your favorite fishing spot. This design, along with a lower profile in the water, provides a near-perfect mix of handling, stability and fishability.
It feeds undisturbed water to the prop to give you a quicker holeshot and better overall performance. In addition to fishing, their roomy deep interiors, smooth ride and handling characteristics make them excellent choices for family outings and tow sports, too. The width of the chines, the deadrise angle, and the presence of a pad and steps — among other facets — change the comfort and speed of the craft.
In addition, different boats are made for different purposes and different buyers in different locations.
Multihull boats have also gained a foothold among anglers because of their deck space and stability at rest. The theory is that such a graduated deadrise puts the deepest angle at the keel so that it lessens impact. But in many cases, designers create what’s called a modified-V or “warped plane” hull — wherein the deadrise decreases from a high of perhaps 22 degrees amidships to 15 degrees at the transom. At the transom, Regulators measure 24 degrees; the deadrise increases almost all the way forward to about 48 or 49 degrees. Beneath the hull, most fishing boats also have strakes that similarly knock down spray but also reduce friction. But some step designs work and some don’t, he explains, referring to the location of the steps and their angle. In addition, rather than running perfectly straight strakes, he staggers them on the steps, which he says creates stability. A slight angle helps skiffs run a little better in open sounds and in locations such as the mid-Atlantic, where inshore anglers venture outside the inlets. Roop says that in designing Cobia boats — targeting a broader demographic — he dialed down the deadrise angle to 21 degrees, making them flatter boats at the transom to reduce rolling. Generally, Roop says, the flatter the boat runs, the less vertical acceleration it generates and the more comfortable it will be. Don’t assume a specific deadrise number automatically pigeonholes a boat’s performance, Roop says.
KAIOU - 35' Shark Adventure Boat for Northshore Shark Adventures, Kaleiwa, Hawaii.  18 passengers, designed to carry an "Anti-Shark cage"  on the transom for people to get up close and personal with the sharks, Jaws style.

Voyageur -- 58' Excursion Boat owned and operated by the National Park Service on Rainy Lake in International Falls, Minnesota.  Original design by Oak Hill Marine Design, with modifications and engineering by Pacific Motor Boat Design.
Fast Cat -- 36' Aluminum Catamaran Whale Watch boat, operating from Victoria, BC Canada.  Transport Canada certified, and delivered in 2006. Although the boat is mostly used for cargo hauling, it is certified for 32 passengers for the occasional whale watching or passenger transporting excursion. These tenders can also make a crossing like Bahamas-So Florida easily in good to moderate conditions which is a big plus. The passages are often 100 miles or less and often a portion of that is in protected or semi protected water. The drawback of the "chined" tunnel is a collection of stagnant fluid in the inner corners, which in some circumstances may disturb the propeller, but that is of minor influence, compared with the importance of a correct and smoooooth longitudinal shape! But — in general — when tinkering with the running surface of a monohull boat, Roop and others often play with the deadrise angle. Flattening the deadrise as it approaches the chines (where the hull bottom meets the sides) should then offer some of the stability benefits of a flatter hull. A flatter transom allows the boat to travel faster than a deeper hull with the same horsepower. Inward from the chine is a flat surface — the chine flat — that might measure two to six inches based on the size of the boat. His Yellowfins feature state-of-the-art-design technology, including a stepped running surface, a flattened pad near the transom and slightly wider, downturned chines.
However, Cobia boats were not intentionally built to run from wave top to wave top — as some go-fast hulls — but rather they employ a fine entry to slice through the waves for a soft ride.
There are Florida Builders like Jupiter and Intrepid (31' to 36') that actually target this market. Dealer installation fees for options, taxes, title, registration, documentation and license fees vary by situation and are in addition to prices shown. The most common error made in building cat hulls, they say, is making the sponsons too wide. Stated differently: The more deadrise you have, the more power you need to get the same speed.
There is also a specialized market served by niche manufacturers for towing harnesses and big reinforced bow eyes, remote sensors and controls, AIS for tenders, etc.
Often the tender will travel under her own power to the next port or anchorage because for short hops its easier than rigging the tow. STATE AND LOCAL LAWS vary; some equipment or engines offered may not be available in some states or may require additional equipment at extra cost.

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