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Bow shapes vary according to the speed of the boat, the seas or waterways being navigated, and the vessel's function. Where sea conditions are likely to promote pitching, it is useful if the bow provides reserve buoyancy; a flared bow (a raked stem with flared topsides) is ideal to reduce the amount of water shipped over the bow. [3]
The Ulstein X-Bow (or just X-BOW) is an inverted ship's bow designed by Ulstein Group to improve handling in rough seas, and to lower fuel consumption by causing less hydrodynamic drag. [1] It is shaped somewhat like a submarine's bow. [2] Bourbon Orca anchor tug, shown in 2012, was the first ship built with an Ulstein X-Bow in 2006.
Comparison between an axe bow (442) and a conventional bow (441) The axe bow is a wave-piercing type of a ship's bow, characterised by a vertical stem and a relatively long and narrow entry (front hull). The forefoot is deep and the freeboard relatively high, with little flare, so that the bow profile resembles an axe.
The original panga design was developed by Yamaha as part of a World Bank project circa 1970. [1] [2] [3] Pangas are commonly operated directly off beaches. [4] The name comes from the panga fish, which is commonly netted. The upswept bow of the boat resembles the machete or knife called a panga. Photo of pangas at Tiburón Island by Steve Marlett.
This shape, viewing the limbs, is designed to take into account the construction materials, the performance required, and the intended use of the bow. There are many different kinds of bow shapes. However, most fall into three main categories: straight, recurve and compound. Straight and recurve are considered traditional bows.
The Whitehall rowboat was the first boat to be constructed in an inverted-hull set-up to speed up the manufacturing process.. The hull shape is characterized by a nearly straight stem, and slight flare to the bow, rounded sides, with a keel running the entire length of the bottom and a distinctive wine glass transom with a full skeg.
A sharp bow on a conventional hull form would produce waves and low drag like a bulbous bow, but waves coming from the side would strike it harder. The blunt bulbous bow also produces higher pressure in a large region in front, making the bow wave start earlier. [6] The addition of a bulb to a ship's hull increases its overall wetted area.
The flatbow is a superior bow design for almost all materials because the stress is more evenly spread out than with rounded limb sections. A bow limb is essentially a flexed beam undergoing bending, and in any flexed beam the farther from the neutral axis (line in the middle of the flexing beam which is not under tension or compression: see diagram in Bending article) the more stress there is ...
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