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Are you looking for maximum cruising speed? Maximum cruising range? Maximum engine longevity? Your priority in this regard will go a long way to establishing an answer. But you will pay a price for doing so: The faster an engine turns, the faster it wears. The logical corollary of this is that if you want to get maximum life out of your engines, you should run them at the point of maximum efficiency. While intuitively true, such a conclusion is neither practical nor palatable for most boaters, since the point of maximum fuel efficiency is typically at or close to idle speed.
Despite the greenest of intentions, not many of us could stand to creep along like that for very long�except perhaps for ex-sailors. This explains why for most boaters the best cruising speed is the one that best balances three factors: velocity, decent fuel efficiency, and a relatively low wear rate. But again, a little hedging is required. But there are some basic considerations. With a few exceptions, planing boats do not have a magical threshold above displacement speed at which optimum running angle occurs, the hull uncovers, and fuel efficiency peaks.
Thanks to the wonders of electronic engines and the plethora of data they put at your fingertips, most of you can verify this yourself on your own boat. If you do, and discover that you are one of the lucky ones who owns a boat with that elusive sweet spot, your search for the best cruising speed is over and you can stop reading here. If not, read on. At this point you could just pick your poison�choose a speed-fuel consumption figure based on your personal preference i. But before you do, consider the following: For reasons too complex to deal with here, diesels can run at higher rpm for an extended time without incurring excessive wear compared to gasoline engines.
It used to be an accepted rule of thumb that a diesel could safely tolerate a cruising speed of about rpm less than full throttle, but that was before the advent of new high-speed diesels that may max out as high as rpm.
Today the sustained cruising-speed guideline I hear quoted most frequently is 10 percent off of full throttle. Gasoline engines are another kettle of fish. If you run them at full throttle, the increase in wear and the fall-off in fuel efficiency are both much greater than they are for diesels. If wear and efficiency are important to you, consider the speed at which you cruise.
The full-throttle limit for modern marine gasoline motors ranges from to rpm. Most mechanics and engineers suggest the best cruising speeds are achieved at and rpm respectively. Digital Boat Show. Vessels 40''. Under 40'. Brokerage Boats.
Boater's University. Marine Services. In an engine, torque produces power � so being able to relate it to horsepower is critical. A device called a dynamometer applies a load on the engine and then measures the amount of power it produces to determine torque. Marine dynamometers are available, too � taking into consideration boat operation by simulating on-the-water operation.
The divisor, 5,, comes from a series of calculations that convert rpm to radians per second. Engines will have a point in rpm at which the power available from the engine has reached its maximum.
In addition to giving you a maximum for passengers and cargo, the manufacturer will also spell out the absolute maximum boat horsepower. The boat horsepower-to-weight ratio is simple to calculate and can be expressed in horsepower per pound or pounds per horsepower. Taking 5, divided by gives you a result of Doing the opposite calculation � taking divided by 5, � gives you a result of 0.
The lower the number, the faster your boat will go. While one or two outboards may give you the same horsepower result, keep in mind additional weight will accompany each additional outboard motor. The amount of horsepower you choose will impact your fuel efficiency. According to Boating magazine , running your gas engine between 3, and 3, rpm and your diesel engine at three-quarters throttle is the sweet spot for fuel efficiency.
Keep this fact in mind as you consider what horsepower to choose. For those who prefer exact calculations, Boating magazine has provided some calculations you can use to run some of the numbers. To do this, you need to know gasoline weighs approximately 6. You also need to know a well maintained four-stroke gasoline engine is estimated to burn about 0. For example, if you want to determine the fuel consumption for a horsepower gasoline engine, you would calculate 0.
As with most decisions related to boating, the use of the boat is always a factor. Are you using the boat just to cruise with friends and family? Or will you be pulling water skiers, wakeboarders and tubers? The addition of pulling someone behind the boat � and the additional weight of storing watersport accessories � increase the need for power and are often a reason to consider adding horsepower to your boat. The rule of thumb is based on weight alone, and says you should have between 40 and 25 pounds of weight for each horsepower.
For example, a 5,pound boat could have an engine with between and horsepower. While this rule of thumb can be a helpful way to get a ballpark range, it still requires some guesswork when it comes to considering your boat handling. Is it illegal to overpower a boat? According to the federal government, yes. There are a few different ways you can define overpowering a boat. The horsepower capacity section of the Code of Federal Regulations contains its definition of overpowering a boat.
There are two different ways the federal government uses to determine the maximum horsepower for any given boat � one is a computation, and the other is a performance test. The way that is used depends on the boat. For the majority, the computation method is best to use. You multiply your boat length by the transom width. Note: For flat-bottom hard-chine boats, with factor of 52 or less, reduce one capacity limit e.
The performance test method is for boats that are 13 feet or less in length, have remote wheel steering, have a maximum capacity of no more than two persons and at least a inch transom height � or at least a inch motorwell height and at least a inch transom height. Through this method, there are very specific instructions for boat preparation addressing everything from motor mounting to fuel tanks to ensure consistency. There are equally as specific instructions for the conditions in which you can perform this test.
The first part of the performance test is the quick-turn test. Setting the throttle at a low maneuvering speed and facing straight ahead, you then turn the wheel degrees in half a second or less and hold it there.
If you can complete the degree turn without losing control of the boat or reducing the throttle, your boat has passed the test. Repeat, increasing the turn in speed until you can no longer pass the test, or you reach the maximum throttle. The maximum horsepower the boat can use while still completing this test is defined as the maximum horsepower capacity, unless it is more than 40 horsepower, in which case, the maximum horsepower capacity is capped at The amount of horsepower your boat has will influence your boat insurance, which is another fact to consider.
There are three main areas of insurance the amount of horsepower you choose for your boat will affect � overall coverage, premium cost and type of policy. This is an extremely important factor, as it could affect your ability to get insurance coverage for your boat. As a rule of thumb, boats with higher horsepower will be more expensive to cover.
In addition to solely considering the horsepower of the boat, the overall size of the vessel, which takes horsepower into account, may determine the type of boat insurance policy you need to get. Boats that are larger and have more than 25 miles per hour horsepower almost always require a separate boat insurance policy.
Bigger and faster is not always better. Putting more horsepower behind your boat may seem like an innocent way to add some excitement to your boating experience, but it could cost you a significant amount of money in fines, lawsuits and damage to your boat.
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