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Average speed formula: how to find average speed (video) | Khan Academy

Boats and Streams is an essential topic for many competitive exams. Many varieties of questions average speed of boat formula workshop be framed from this area.

We use the fundamental concepts of average speed of boat formula workshop speed and distance only to solve elementary questions on Boats and Streams.

However, some types of questions are tricky and take lots of time to solve by applying textbook approach. Fortunately, there are some shortcut formulas available to handle such problems. In this article, besides an understanding of the basic concepts average speed of boat formula workshop boat sand streams, we will also learn few tricks to solve some exceptional questions.

Some shortcut formulas related to the speed of boats and streams is handy as we require them frequently. Below are the lists of the formulas:. Question 1: A boat is rowed down a river 28 km in 4 hours and up a river 12 km in 6 hours.

Find the speed of the boat and the river. Question 2: A man rows 18 km down a river in 4 hours with the stream and returns in 12 hours. Find his speed and also the speed of the stream. Question The speed of the boat in the still water is 6 kpmh, and the speed of the stream is 2 kmph. The boat goes a certain distance down the stream and comes back upstream to the same place from where it started.

Find the average speed of the boat in the entire journey. Average Speed. Important: If the boat takes t down and t up respectively to travel same downstream and upstream distance, then we the following relation:. Question 4: A boat takes 6 hours to go downstream and comes back upstream in 12 hours. Find the ratio of the speed of the boat and the speed of the stream.

Question 5: A man rows 10 km upstream and back again to the starting point in 55 min. If the speed of the stream is 2 kmph, then find the speed of the boat in still water. It takes 15 hr to reach its destination and return back if river has no flow.

For the same journey it takes 16 hr if river is flowing. Find speed of flow of river. Your email address will not be published. Skip to content Boats and Streams is an essential topic for many competitive exams.

Boats and Streams � Terminologies: Stream: It implies that the water in the river is moving or flowing. Standard Method: Let one side the distance be d km.

Therefore, the average speed of the boat Shortcut Formula: Average Speed Finding the ratio of speeds of the boat and the stream Important: Average speed of boat formula workshop the boat takes t down and t up respectively to travel same downstream and upstream distance, then we the following relation: Question 4: A boat takes 6 hours to go downstream and comes back upstream average speed of boat formula workshop 12 hours.

Standard Method: Let the common distance be d km. Finding the total time of the journey. Shortcut Formula: Let the speed of the boat in still water be x kmph.

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We can erect average speed of boat formula workshop additional boat .

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.

Here are a few examples of how your need for speed can get you in trouble when it comes to boat maximum horsepower. In some cases, yes. There are federal laws in place to ensure the appropriate horsepower limits are listed on all boats. State and local laws regarding overpowering your boat vary.

Otherwise, your excess horsepower may be putting you at risk for fines and other consequences. While you may not have fines because of breaking state and local laws, you are very susceptible to being found negligent and the victim of a lawsuit, especially in a case where there are damages.

However, it is still true in some cases, and that additional weight is another component of high horsepower that can be dangerous. For example, the additional weight can make a self-draining cockpit useless, leading to flooding problems.

Every part of your boat, from the transom to the bow, was created to withstand a certain amount of pressure and stress.

As a boat manufacturer, at Formula Boats we know the balance of giving you the power and speed you want while making sure safety is a priority. You can be sure horsepower options for each boat model we provide are within the limits we believe maximize your performance while maintaining safety. Discover a boat you like through our boat builder? We have dealers located throughout the country ready to help you find your boat.

Get started by searching for the dealer location closest to you on our website. Even though we narrow down the options, it can still be tough to choose the amount of horsepower that will give you performance based on boat weight and use, but also fuel efficiency. Necessary cookies are absolutely essential for the website to function properly.

This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information. PAR , Nov 27, As Gonzo suggests there are endless discussions about what the definition of planning I want to take a stab at it, though I know there is an area that will cause some debate.

Just to keep this effort clean, I will only refer to a planing hull, lets leave the other displacement hull issues out of the discussion.

At this point the only forces on the hull are buoyant forces. We apply power, the boat begins to move at 3 knots, the speed causes some hydrodynamic forces planing forces to act on the hull. The boat is now supported by small planing forces and larger buoyancy forces We put increase the boat speed to 6 knots. The planing forces become higher, and the buoyancy forces become less as the boat is now beginning to lift out of the water.

The boat is higher out of the water than at rest when only buoyant forces acted on it. There is still water against the transom but the pressure in this area is approaching atmospheric. The water coming down the side of the boat has not separated at the transom sides We apply more power to 10 knots at which point the water separates at the transom, the pressure on the transom is atmospheric, ie no water pressure.

The planing forces are large enough to support the boat and the buoyancy forces ZERO and this is where the discussion will get interesting This is the point that that I would call full planing. Not efficient planing as the bow will still be high, as the Center of lift is quite far ahead of the CG. The reason that I suggest that there are no buoyant forces at full planing, the hull is being supported by dynamic forces only is that by definition only, the body of the boat is not immersed as Archimedes principle states.

One side, the transom is not immersed in the water. There are some naval architects who say there are still buoyant forces but cannot quantify them and some who say dynamic forces only. In any case, if you use my definition of when the boat becomes full planing at the speed at which the transom becomes exposed to the atmosphere and loses any benefit from buoyant forces by definition of an immersed object, we have a numerical value for a specific hull full planing speed.

I expect some strong response to my statement, that there are not buoyant forces acting when the water separates at the transom. My question to this will be " show me some calculations that will put a value on dynamic forces vs buoyant forces at different planing speeds". Barry , Nov 27, DCockey , Nov 27, Mr Efficiency , Nov 27, It is and interesting observation that the transom only has atmospheric pressure.

I think that there still is displacement though. The difference is that the hole left behind the boat is also displaced water which uses requires power.

David, I read quite a bit of the 47 page discussion on planing looking for a quantitative analysis to define planing, and the other ongoing thread about semi planing, semi displacement etc. Some with marine design credentials and some with opinions and yet a quantitative answer eludes them as well as us or we would not be having to try to get a handle on it Mr E, there is no doubt that there is pressure acting on the hull, but if buoyant forces by definition result from immersion, with all sides of the water in contact below the water line, would there be buoyant forces on the hull when I the water is moving past the hull at speeds say from 10 knots up to knots and one side of the hull is exposed to atmosphere?

Gonzo the transom would actually a little less than atmospheric as exhaust gases existing through the transom will often stay with the transom.

In Sedans question, and I fear that I have lost site of what he is trying to do. But in his last post it appears that he is preplaning at 6.

And now he wants to find a way to have this move to 10 knots, to gain efficiency in this subplane speed. He wants to do this by reducing weight but if he can plane at my definition at 6. You must log in or sign up to reply here. Show Ignored Content. Similar Threads. Replies: 12 Views: 3, Bing , Mar 2, , in forum: Hydrodynamics and Aerodynamics.

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