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Wooden ideas | boat building, boat plans, wooden boats Dec 04, �� The formula is roughly, 4 hp per lb. Then go to the internet to find a propellor calculator to determine your propeller size. This yields lb. per 1 hp with a correction for propeller size. With two adults aboard, my skiff displaces about lb. WoodenBoat magazine for wooden boat owners and builders, focusing on materials, design, 37' Motor Sailor "Emma Morgan" The SQUIRT is a small runabout for the young at heart. But don't let her size fool you; she Boat Launching. LOTTE. LOTTE was built in by Lake Union Drydock in Seattle. She was moved to Vermont in and. Jun 14, �� Weight of the motor will sag the azz end of that boat low low in the water, too much of a risk of back wash. Theirs a reason why manufactures have outboard limits on their boats. Typically a 35hp would be the largest "I" would suggest on a 16ft, but all that info is on the transum of your boat. Weight limit, max outboard size recomended.
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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. It may be more cost efficient to buy a new motor with electric start.

Also keep in mind maintenance costs and downtime associated with the type of motor you choose. For example, DFI 2-strokes require a constant supply of oil, while 4-strokes have more moving parts that require more frequent service. Online Outboards Blog Contact Us. My Account. Welcome to OnlineOutboards.

Login Create Account. Shopping Cart. Tohatsu Outboards Tohatsu 2. Free Shipping see details Monthly Payments. That's why we're here to help you choose an outboard that's right for you. First, how much power is needed in outboard boat motors? Next, how much speed do you need? What type of engine do you want? What type of shaft should you get? Motor Weight As we mentioned earlier, you need to match the size of your outboard to the size of your boat to ensure that you have sufficient power for speed, maneuverability and safety.

Manual or Electric Start Depending on your desire for convenience as well as your budget, you can choose an electric-start option to make starting your outboard easier. Maintenance Also keep in mind maintenance costs and downtime associated with the type of motor you choose. I see no reason why it wouldn't. What about an electric drive vs diesel? With different torque curves how would one figure out what size electric motor to get to replace a diesel?

What if one wanted to put twin electric screws in place of a single centerline diesel screw? Sorry for any thread drift, I'm thinking out loud now.

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Originally Posted by Sailor. Garret, What boat do you have? Re: Guide to calculate the right motor for a Sailboat I've read a few articles on it. Most claim regenerative capabilities. Most cannot seem to get the regeneration to work. Seems the boats move just a little too slowly, the deadwood of the keel blocks 2 bladed props for a significant portion of their rotation and the blades are optimized to push the boat, not generate power being the main reasons why they can't regenerate.

That's why I'd like to move a CL diesel screw to two screws out on the side of the hull. Replacing under the cabin sole tankeage with batteries would be fine in the boat I have in mind. Re: Guide to calculate the right motor for a Sailboat It all depends on how adventuresome you are, and if you will sail areas with high currents and tidal rips.

If you find yourself clawing off a lee shore in high winds, you may wish for a bit more power than necessary to pootle about the harbor on calm days The current engine is underpowered for my purposes. Hearing nothing to the contrary I think a 40 HP engine is about right. I got a few quotes on HP engines. Actually not as bad as I anticipated.

The boat I am repowering is Mary Loring, a 40' Warner cutter. Cornwall, Suffolk. Posts 7, Re: Guide to calculate the right motor for a Sailboat The rule of thumb I always heard for heavy displacement sail boats engine therefore auxiliary, an important distinction is 3hp per tonne lbs. My boat is 12 tonnes very ish , so I should need 36 horses.

However, I have been on boats trying to claw off a lee shore against waves and wind, and also trying to make harbour in head winds, at night with a tired crew, both times with 'rule of thumb' engines for auxiliary engine sail boats.

Both times the engines were maxed out, and we were going backwards. A rule of thumb is an average guide, and does not accommodate extreme situations.

Besides, what if you come across someone who needs a tow? I doubled my rule of thumb hp, and split it into 2 engines for redundancy. It only has to save my ass and my boat once in a life time, and it will have been worth it. What's kg extra on a 12 tonne boat anyway? Re: Guide to calculate the right motor for a Sailboat One last thought Engine manufacturers are, being polite, optimistic about their power ratings.

A 50hp rated engine will not deliver 50hp at the prop, even at max revs. Originally Posted by lupussonic. The rule of thumb I always heard for heavy displacement sail boats engine therefore auxiliary, an important distinction is 3hp per tonne lbs. Originally Posted by Dave Hadfield. Just make sure it has a long-shaft, or the water-pump intake will be exposed. Re: Guide to calculate the right motor for a Sailboat Naval architect Dave Gerr has presented various formulae to calculate the relationship between boat speed and required horsepower for a displacement hull operating at speed to length ratios less than 2.

Here is one. For example, my Allied 36 has a displacement of 15, lbs and a waterline length of 27'.

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