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����� �������� ����������� "Outboard Universal", 4� Mannol - ��������-������� myboat059 boatplans Jun 09, �� The power-to-weight ratio is calculated by dividing by 5, for hp per pound. Or, swap the formula, divide 5, by , and it would be pounds per hp. Power-to-weight ratio most often comes into play when deciding how many motors one wants on . Jan 08, �� Depending on the type of watercraft you have and the type of motor you need, you can find outboard motors that range from as light as just 13 kg/ lbs for a hp engine to as heavy as kg/ lbs for a hp motor!Author: Cumberland Watersports. How to pick the right outboard motor size for your sailboat? To get the right amount of horsepower needed to efficiently propel a sailboat, divide the displacement of the boat (in lb) by You need approximately 1 HP per lb of displacement or 4 HP per lb. Most sailboats don't need a motor with more than 30 HP.
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So if you consider a diesel, you can do with less HPs. High windage hulls multihulls need a bit more. A multihull or larger hull in general suffers from more friction because of the larger surface. So the engine needs to work a little harder. If you sail longer distances under power , or against the wind it's a good idea to get a larger engine but not too large.

This helps you to save on fuel since you have lower RPM. Especially if you sail offshore or on open sea. The engine needs to work harder due to stronger wind and current. Smooth hull designs need less HPs than bulky hull designs, like the classic wooden clippers and crabbers for example. So why Dinghy Outboard Motor Weight Plan not get the smallest engine and get the best fuel economy? There are a couple of advantages to getting a slightly bigger engine:.

To perform optimally, an engine should get up to speed. This kills fuel efficiency and also the cooling system won't operate optimally. The propeller size is very important for the RPM. If your prop diameter is too wide, the engine can't get up to speed and struggles to build power. Bad for fuel economy, bad for the engine, and bad for performance. If you struggle to get to high RPM, your prop is too large.

If your engine is constantly in the red, you're underpropped. So don't go too big on the prop, but also don't go too small. The easiest way to get it right is to check the engines manual and see what the manufacturer recommends. You can definitely go too big on a sailboats engine. An overpowered yacht doesn't make any sense. True, it can look cool, but it can't feel cool. Every displacement hull has a maximum hull speed. That means that it cannot go any faster than the max speed.

So if your engine can cruise at that speed, it's not getting any better. The problem with displacement hulls is that they displace the water, or in other words: they push the water in front of them. They cannot move any faster than they can push away the water. And because the resistance increases as speed increases, there's an absolute, physical speed limit for each keelboat.

Fun fact: the longer your boat, the higher the hull speed. Want to know the maximum hull speed for your boat? You can find it in this article. Bear in mind that a large engine also has the following disadvantages:. As long as it gives you enough control and good handling, it will get you there. If you give up on going fast, you can actually get really good fuel economy and your engine will last you probably 20 years. If you want to go fast, a sailboat is not the right one for you. You should instead get a powerboat.

I'm just kidding. Do sailboats have motors? Most sailboats are power assisted boats, which means they have a small auxiliary engine to cruise in light air. When a sailboat is sailing under engine power, it is considered a motorboat and it doesn't have right of way.

Thanks for explaining how you can figure out what size you need for an outboard motor. You mentioned that you should find the displacement by weigh a boat on a truck scale. You could literally see the hull displacement as the amount of space your hull takes up in the water.

How do you measure for shaft size, most outboard motors are for flat bottom and say measure to the bottom of the boat, most sailboats tapper to the aft. Where do you measure for a tapered bottom sail boat? Will a 5 horse Honda 4 stroke be ok for a 25 foot Pearson Commander sail boat. Thanks for your time Luke. Great post, Dinghy Outboard Motor Weight 2020 thanks for the info.

The engine is in pretty good condition, but is old and the original one from ! So the question is: is it possible to put an outboard engine on all boats? Is there some factor that would make it impossible to mount an outboard engine on the boat? What is minimum length that a sailboat can go without an outboard. Hello Mr. Buckles, Thanks for the informative article. Can I get away with a 4HP?!? What size prop would I need?!? Unsure of what hp is going to be needed?

Being a fan of the waters, I found the life expectancy of marine diesel engines an interesting topic to deeply research. A sailboat doesn't have to be expensive if you know what you're doing.

If you want to learn how to make your sailing dream reality within a year, leave your email and I'll send you free updates. I don't like spam - I will only send helpful content. In Conclusion Related Questions. Did you find the answer to your specific question? Comments MitI Thanks for answering my questions. It may not display this or other websites correctly. You should upgrade or use an alternative browser. Boat weight to HP ratio? Joined Dec 28, Messages Is there a way to figure horsepower needed for a boat by it's hp to weight ratio?

Joined May 4, Messages Re: Boat weight to HP ratio? Don't think there is. Hull shape length, draft, beam, deadrise, chines will influence as well, making one hull faster than another even though they may nominally weigh the same.

In other words, you probably can't determine the optimal HP for a boat by its' weight alone. Now, if you know the weight and the hull type i. Joined Nov 11, Messages 51, Joined Apr 28, Messages Occasionally the speed may be higher than the slide rule dictates. Joined Dec 5, Messages This is assuming your weight is accurate, and you are dealing with a flat-bottomed boat in still water. It is very simple. Take your boat weight and divide by So, a lb boat boat, motor, gear, passengers , flat bottom or still water would take 20HP to plane.

If your boat with all gear is heavier, it will take more HP to plane. If your boat has a v-hull, it will take more HP to plane. If your boat is in rough water, it will take more HP to plane. Note: this is only to plane, not run around at 30 MPH. So, let's look at this. You have an aluminum boat that weighs lbs. You weigh lbs.

You carry 6 gal of gas total weight approx 48 lbs. This is now a total of lbs. So, you stick a 15 hp engine on it and you are happy. You then invite your friend to fish with you on your new boat. He weighs lbs. You now have lbs, and your boat will not plane, and you are not happy Just something else to think about Joined Feb 13, Messages Modified Vee lbs empty hp thanks!

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