Power (W) is determined by dividing current (A) by system voltage (V). For example, a 6 watt navigation light bulb in a 12 volt system will draw 0.5 amps, which can be converted to 10 amps when switched for ten. For instance, an electric trolling motor of 1kW might be ideal for fishing from a small boat with a 12V battery and a current of 50A.
To determine the optimal voltage for your needs, you should consider the battery capacity, voltage, and resistance. If you motor for five hours or more a day at medium speed, it is essential to charge your batteries. Most electric boat batteries can be charged using household current (Level 1) charging, and many are designed to be compatible with standard Level 2 electric.
In addition to battery capacity, DC systems on boats also play a crucial role in starting engines, running electronics, VHF radios, and DC lighting systems. An isolation transformer can protect your boat from underwater metal waste due to galvanic corrosion and reverse polarity problems.
Wind has a direct effect on engine speed, and if the boat moves against the wind, wind loading creates opposing forces. Top Australian navigator Adrienne Cahalan shares expert tips on using currents on bluewater passages and ocean races. Currents are the horizontal movement of water in and out of the bay, with a direction and speed similar to a boat.
Sailing on water is similar to using tides and tidal currents, as they can travel fastest to the sides at nearly 100% of the wind speed. High-performance boats can exceed 100% to the side, around 55 miles per hour.
📹 Twin Engine Yacht Docking with No Thrusters – 48 Foot Viking Yachts Sportfish
Yacht Management Tips: Docking 48 foot yacht with only twin engines and no thrusters. Explaining my approach to docking and …
Are ocean currents important for ships today?
The correct options are B They accelerate the speed of ships. D They help ships save considerable amount of fuel.Ocean currents are quite important in water transport. As far as possible water transport is carried out along ocean currents. They accelerate the speed of ships and also save fuel to a considerable extent.
Who benefits from ocean currents?
Even the free-swimming animals can benefit from riding currents. Many marine vertebrates such as herring, eels, and turtles, hatch in rivers or close to the coast. Small and weak, the juveniles need currents to carry them to the open ocean feeding grounds where they grow and mature.
Because currents tend to concentrate food resources in limited areas, such as by upwelling, they make it easier for predators to find prey.
But a reliance on currents – for transportation and for maintaining water conditions – could be the downfall of individuals and populations. When currents shift, because of plate tectonics or climate change, ecosystems would be thrown into turmoil. The young could be carried into areas where they could not survive, and adults could be bathed in water whose temperature, salinity, or chemistry they cannot tolerate.
What is the displacement of a yacht?
The displacement or displacement tonnage of a ship is its weight. As the term indicates, it is measured indirectly, using Archimedes’ principle, by first calculating the volume of water displaced by the ship, then converting that value into weight. Traditionally, various measurement rules have been in use, giving various measures in long tons. Today, tonnes are more commonly used.
Ship displacement varies by a vessel’s degree of load, from its empty weight as designed (known as “lightweight tonnage”) to its maximum load. Numerous specific terms are used to describe varying levels of load and trim, detailed below.
Ship displacement should not be confused with measurements of volume or capacity typically used for commercial vessels and measured by tonnage: net tonnage and gross tonnage.
What effect does current have on a boat?
When sailing against a current, a boat can never reach hull speed. The maximum speed in this case is the hull speed minus the current’s speed. If the current is as fast as the maximum boat speed, a boat can not go anywhere. If it is faster, the boat will actually sail in the direction of the current instead of forward.
How do currents affect shipping?
Ocean currents significantly affect Earth’s climate.They transport heat, nutrients, food sources and species, among other things, across the ocean.Currents also play a major role in shipping efficiency. Optimising shipping routes so they are in the same direction as surface currents can minimise transport time, save fuel and avoid risk to a vessel from extreme weather, waves, winds, or currents. Understanding currents can therefore help freight companies reduce travel time and fuel usage and stay safe – something of high importance to many connected economies across the world.
Surface currents and deep ocean currents. Currents can be grouped as either surface currents or deep ocean currents. Surface currents flow up to a maximum depth of about 100m and have two main driving mechanisms: surface winds, and tidal flow due to the gravitational attraction of the Sun and Moon. Deep ocean currents, on the other hand, are created by differences in water density controlled by water properties such as temperature and salinity.
Ocean currents include horizontal (latitudinal and longitudinal) and vertical movements of water. They may be short-term and local (a few km wide), such as eddies (circular currents of water) and meanders (lateral wave-like currents), lasting only hours. Alternatively, they may be longer-term and global, such as semi-permanent circulations extending over a season.
How many amps does a boat use?
A starter battery needs an amp rating between 75 and 400 for just a few seconds to get the engine going but doesn’t require a high storage capacity. A marine battery needs only about 80 amps but should have the capacity to run for long periods. A traditional 12v dual-purpose marine battery can do both, making it convenient for those with limited space.
Your Boat’s Power. It’s vital to get the correct amperage for your boat’s needs. Otherwise, you could put yourself or others in danger. The battery could get hot, damage your equipment, or even explode if there isn’t enough supply.
Knowing how many amps your boat battery should have is essential for those who want to enjoy their day to its fullest.
What type of boat is most affected by water current?
Hull type has the most effect on how a boat reacts to the current. Displacement-type hulls with considerable draft are affected by current to a greater extent than shallower-draft, lighter, planing-type hulls. Water is much denser than air, so a half-knot cross current may have more effect on a displacement cruiser than a stiff 15 to 20 knot wind.
On the other hand, given the same conditions, a planing – type hull with a high tuna tower could be more affected by wind than by current. Neither a displacement nor planing boat can ignore the wind current. Skippers of both will find one of them a major factor affecting the boat’s maneuverability. This becomes most apparent while running at low speed in close quarters.
Wind and Current. Large ocean undulations, generated by distant storms and unrelated to local causes, are called swells. The surface of a swell may be perfectly calm, but it is usually textured by the wind into groups of tiny ripples called “catspaws”. The ripples gradually build into waves.
How does electricity work on a yacht?
In comparison, larger boats such as yachts or catamarans will usually have a house electrical system in addition to the DC power system. To power these crafts fully, you’ll need AC power. You can achieve this by plugging into shore power directly or using a large enough inverter with your house battery system. You can also use your generator to create AC power, but this option isn’t typically feasible for long-term use.
Choosing a Marine Battery. For your starting battery, we recommend going with the manufacturer’s suggestion. They’ll know which type of battery will work best with your boat’s engine.
For your house batteries, however, we recommend choosing lithium marine batteries like our high-quality Battle Born deep cycle lithium batteries. This is because they’re at the forefront of battery technology and have countless benefits compared to lead-acid batteries. For one, lithium batteries are the most energy-dense batteries on the market right now. Thus, you can store much more energy without taking up as much space or weighing down your boat.
How do ocean currents help the ship?
Ocean currents help ships sailing along the currents to speed up. They also help the ships in conserving fuel. Q. Returning helped ships get away from western coast of India to the Arabian sea.
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How much electricity does a yacht use?
Typical Sailboat Energy UsageDeviceCalculationwatt-hrsEntertainment systems100 watts for 8 hours800 watt.hrsWater Maker1100 watts for 1 hour1100 watt.hrsInverter 12v dc to 110v(220v) ac*110 watts **Total4400 watt-hrs (4.4 kW.hrs)
This article is an excerpt from NauticEd’s Bareboat Charter Course, a comprehensive online course that equips you with all the necessary skills and knowledge to successfully charter a yacht. The Bareboat Charter course is part of the Bareboat Charter Master bundle of online courses, fully preparing you for near-coastal sailing and sailing charters.
You can learn to sail and improve your sailing with NauticEd, the international leader in sailing education.
Here we show the devices and how much energy you would typically use on a sailing boat on a sailing vacation each day.
Is a boat AC or DC current?
What is the Electrical System? Your boat is designed to run on direct current (DC). Most operate on 12 Volts direct current, abbreviated 12VDC.
The electrical system of a boat is the glue that holds the boat together. Nearly every other system on the boat depends on the vessels electrical system to operate.
Your boat is designed to run on direct current (DC). Most operate on 12 Volts direct current, abbreviated 12VDC. However, some boats, particularly of foreign manufacturer, may operate on 32VDC or 24VDC. Make sure your new vessel is designed to operate on 12VDC. I would not recommend the purchase of any vessel with a DC system other than 12VDC for the average boater. Although there are ways to get around the difference in voltage it is not something the average boater can do.
The 12VDC battery shown in Step 1 above delivers 12VDC power to the DC load of the boat. This load includes lights, electronic equipment, pumps, and any other system requiring DC power. To replace the power used from the battery the boat motor has an alternator attached to it that recharges your DC battery (s). This is the basic system found on most small boats. All is well as long as you run the boat motor often enough to keep the battery(s) charged.
What effect do currents have on marine life?
By moving heat from the equator toward the poles, ocean currents play an important role in controlling the climate. Ocean currents are also critically important to sea life. They carry nutrients and food to organisms that live permanently attached in one place, and carry reproductive cells and ocean life to new places.
Rivers flow because of gravity. What makes ocean currents flow?
Tides contribute to coastal currents that travel short distances. Major surface ocean currents in the open ocean, however, are set in motion by the wind, which drags on the surface of the water as it blows. The water starts flowing in the same direction as the wind.
📹 The GAME CHANGER when docking – Yacht Controller
MarineMax uses our yacht controller for the first time and their reaction is priceless. It truly is a GAME CHANGER! Couples or solo …
Excellent job, Cap’n! Used to run my grandfather’s Viking 58′ (1994 same year as this beauty) and you’re absolutely correct in stating it’s a different beast vs today’s boats with thrusters, and joysticks. Like this one, he had twin controls which I actually prefer vs the Palm Beach controls. Her big props and the ridiculous amounts of torque from 1400hp MAN’s, very little need for throttle. Being able to walk her laterally port/starboard into a parallel dock was one of the coolest things I learned from him. Old salts would ask if we had thrusters, and when they found out we didn’t, they were rather impressed. Sure do miss that ol’ girl! Something about that view up on the bridge with wind and salt in the air! My current center console just can’t measure up to that feeling. Oh well, gotta enjoy what ya got, and hope those PowerBall numbers hit!
I prefer to do a little longer but fewer bursts even if many short bursts would be beneficial for maneuvering. I’m thinking that each time I engage the clutch is one step closer to a big expensive rebuild of the gearboxes and that’s something I’d like to take as many years as possible before it needs to be done.
I’m concerned about the transmission wear with the rapid in-out movements & especially quick forward-reverse. Those “big props” have a lot of momentum to overcome.Lots of “wear” there. Good demonstration but little challenge: I routinely back my 2000 44′ Silverton Aft cabin ( can’t see stern from bridge) in my home port slip with 18 inches clearance each side between pilings, a 5- 10 kt cross wind & a falling/ rising tide flowing perpendicular to the slip. Now there’s a vidio to make. Yep, I occasionally have to use a bow-tie ( outer) piling as a pivot in a tide running the same direction as a 10 kt wind just using 2 sticks. No quick “flashes” of the gears – my 2 trans have not been out of the boat in 22 years.
Dan this article is amazing. There is such a surge in new owners of blue water boats here in CA and a lot of discussion as to do they need the technology. What you have done here is shown people that with a little practice the skill can be learned. I think it is always a good idea to know how to dock without the technology assist just in case! Beautiful instruction and a great how to article without it feeling like that type of article. Thank you for the great content!
Thanks for this excellent article (great editing). I´m from Argentina, I have a 33 footer similar to a Betram hull (made in Argentina… circa 1981). Repowered by twin Volvo 200 hp, straight shafts. Nowhere near fancy… Far away from your beast 😉 (old school emoji..). But I do certainly love my boat. Anyways, great article! Thanks a lot!
Outstanding footage to have three simultaneous camera angles and great job with the manoeuvring. My only adverse comment would be that you could replace all those double half-second gear engagements with single one second gear engagements and you will get twice the life out of those gear boxes. It would be half as many “clunks” for your passengers as well.
My 2000 65’ Viking has single lever electronic engine control which has quite a gear shift delay, it took me awhile to get the delay timing exactly right for me to get comfortable with it, also the props for the boats length are quite close together so the twisting is not so pronounce. The boat does have a minimally useful bow thruster which helps just minimally.
… Nice job, Captain … the engine controls on our twin engine that I grew up on, where set up Port Engine/Starboard engine … shifters on the “insides” w/ the throttles outboard w/ short extensions on them. I learned ( from the captains @ Montauk …), to put my butt on the wheel/helm, face aft and work the engine controls backwards … but they operate in the direction of travel …
Great article, Since i bought my boat last summer, 79 Trojan F36 i’ve only docked a handful of times. I did ok. i had experience with tracked construction equipment which made using the two engines to maneuver a breeze. I never thought to check the position of the rudder though – thanks for mentioning that. I’m a single guy and there is not always someone around to assist. When my slip neighbors are around they are great- is it ok to try this solo? when i did, i picked a day when the wind was very light; often that is not the case, which limits my options for getting out of the marina – As i learn boating i’m feeling that captaining a boat is a bit like playing chess – you need to think three steps ahead or you’re likely to loose.
Great job. But one thing to recommend, try not shifting those transmissions a lot like that, aspecially not going completely in gear. It will wear out your clutches faster as well as any other wear component in that transmission as lubrication pressure drops substantially when shifting until the clutch builds pressure. I’ve done transmission replacements in a 52 viking and it was about 80 hours or labor just to install one
These trans NOT designed for this much and as fast as he is doing the shifting. Obviously, he is a superior boat handler for sure. I used to own a yachts diesel service business. I think just a little slower on those shifts would greatly benefit the transmissions. Just a slight hold before going into reverse and forwards would do. But as we all know how nerve-racking this is we probably all would do the same thing. Then lose a trans and really be in trouble. The tans have to stop in neutral before shifting forward or reverse. You cannot go from reverse and then straight to forward without a slight pause, you can feel it through those Morse cables. But….. this captain is heads and shoulders better tan 99% of us. Awesome article. You are prefect at the helm. Just a slight old-school adjustment to go easier on the mechnicals.
I am looking at a 46 foot Viking with 692’s with turbos to buy, so really close in comparison. I was surprised to see that its cruising speed is 39mph so when you said it will do 7 knots (8mph) at idle I wasn’t surprised. I am looking to go long trips with mine (if I buy it) so my question is could you please tell me any fuel usage? I have a 36 foot gasser now so I know all about lower rpms lower usage. But if you could tell me at idle, cruising and full power that would be great! Just guest a mites are fine lol. I am assuming yours is a diesel as well. I want to know what I will get with a fuel tank that is over 700 gallons as I want to do some traveling and maybe the loop as well.
Good article overall, now a days not many people know how to actually “walk a boat” into a pier, but!! I will point out the flaw (not in a negative way), you are jockeying the throttles/shifters, it’s actually not correct and you’re actually not accomplishing anything by doing so. Yes, some will argue that it’s giving short bursts, it’s actually not. What is happening when you’re doing that, you’re riding the clutches, you’re not allowing the reduction gear to fully engage, thus, actually (slowly) damaging the clutch plates. How do I know this? As a licensed Capt, a licensed marine engineer and having been in the industry for 20+ years, is a habit that I had to learn early on to “undo”. When you actually tear apart a reduction gear and see the wear yourself, you will understand and it will make sense. Mechanical levers will take the beating, fly by wire will actually give you alarms when you “jockey” them. Just sharing knowledge, not a negative post in any way and great article showing good boat handling skills in tight quarters.