Outboard hp vs boat size

For any outboard-powered boat over 20 feet in length the maximum horsepower rating is essentially at the discretion of the boat builder. This is dictated by depth of your boats transom as measured from top to bottom in the centre.

Some manufacturers such as Tohatsu do recommend midrange fuel usually 89 octane.

Outboard hp vs boat size. 8hp 98 hp Weight 25-45 kg Small and powerful this hp range is popular for use with inflatable boats of 3m 45m aluminium boats 3m 45m in length larger portable folding boats and lighter fibreglass boats up to 45m. These hulls typically weigh to. 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.

However the advantage of going with a smaller outboard is that its easier to lift and carry. Outboard size to boat size Pat It depends on how heavy your boat is and how well its made. A 99 or 15hp is fine for a light 14 footer.

Its not uncommon to see some of the heavier well made boats like Grunman and Crestliner running 20hp or 30hp. You probably cant go wrong with a 15hp. The average 15hp weighs around 80lbs.

Outboard Horsepower Capacity. Compute the Factor Boat Length x transom width. If Factor is to the nearest integer 0-35.

For flat bottom hard chine boats with a factor of 52 or less reduce HP one capacity increment. If the Factor is over 525 and the boat has. If the plate says a 120 horsepower engine is the largest you should use then.

120 x 11 132 or a 130 horse motor since the horsepower of outboard motors is rated in multiples of 10. This adds ten percent to the horsepower and will make it easier for your boat. For example if your boat is rated for a maximum of 20 hp your mid-range horsepower would be 1125 horsepower.

However youre not likely going to find an 1125 hp outboard motor so just round up or down to the nearest size. A 10 hp or a 15 hp outboard will better suit you. Other shaft lengths exist.

Many small engines 10HP or less have shafts around 175 long 45 cm. Outboards sold for sailboat propulsion often have an unusual long shaft for their size. Very large engines 250 HP or more can have 30 long shafts.

From here I switch to inches only as units. 1 25 cm. Select the correct shaft length.

This is dictated by depth of your boats transom as measured from top to bottom in the centre. If your boat is about 15-16 you will need short shaft and if it is 20-21 you will require long shaft. Small inflatables and dinghies tend to require short shaft whilst larger boats usually require long or.

But the truth is high-octane fuel usually 92 or 93 octane is a waste of money for the majority of outboards. Most are built to run happily on 87 octane. Some manufacturers such as Tohatsu do recommend midrange fuel usually 89 octane.

Check your owners manual and fuel up with what it prescribes. Both were fitted to identical Brig Eagle 8s but one boat was fitted with a 300hp Suzuki outboard while the other was fitted with the 350hp version of the same engine. Other than a few differences in tube and trim colours the boats were to all intents and purposes identical bar the engines and the addition of power assisted steering 1900 and an electronic jack plate 1495 to the 350hp.

Lets take the 74 lbs of thrust trolling motor from Minn Kota as an example. It has a max amp draw of 45 amps at 24 volts. Here is how to compare pounds of thrust to horsepower.

45 x 24 x 085 x 09746 111 hp. So 75 pounds of thrust of a trolling motor roughly equals to 111 horsepower. The rule of thumb guidelines based on weight alone would be between 40 and 25 pounds of weight per 1 hp.

In other words a 5000 lb boat fully loaded could have a 125 to 200 hp engine. The wide range based on weight alone is due to the variety in design and handling characteristics of a given boat. Yes you can ballpark the size outboard with.

Picking the Size of Outboard Motor For You. Truthfully you dont have too much say in what size of outboard motor you should buy. The choice is made for you by the manufacturer of the hull.

By law the boats Coast Guard placard states the maximum horsepower that can be fitted as well as the maximum weight that can be carried. For any outboard-powered boat over 20 feet in length the maximum horsepower rating is essentially at the discretion of the boat builder. If the boat is less than 20 feet long the power rating is determined by a formula.

For remote-steering boats the formula is. Stern width in decimal feet x length in decimal feet x 2 90 max. In this quick Boating Tips video well nail down three important tips that will help you make the right choice when deciding what size outboard engine to get.

If playback doesnt begin shortly try restarting your device. Videos you watch may be added to the TVs watch history and influence TV recommendations. To get the right size electric outboard motor you need to consider the boat size weightlength boatload your desired speed and the boating environment etc.

Generally speaking a 1kw3hp electric outboard motor is enough to provide a satisfying speed and range for tenders dinghies and daysailers up to 15 tons and 6kw10 hp electric outboard motor is for RIBs fishing boats and. It depends on the boat. Some 14s are wide and deep and could handle a 25 while others are narrow and shallow and would be scary at any higher speed or even sitting still with all that weight.

A 15 hp is a good compromise same weight as a 99 and enough speed. Technically bigger is better but the truth is that you have to pick the right horsepower for the boat type and size that you own. If you have a small boat and you get a large engine it might affect the ships stability.

Plus the additional power can cause damage to the transom. On the other hand using a too small outboard motor on a boat thats too large can effectively burn out the engine due to. The size of the motor that should be mounted on a Jon boat will vary with the size of the boat and its weight capacity.

For Jon boats between 8 foot and 16 foot 8 hp 20 hp motors will offer more than enough power to push the boat upstream achieve a respectable speed and get the boat on plane. 18 foot Jon boats can usually take a 20 25 hp outboard motor. Maximum engine horsepower for the vessel.

Maximum number of adult persons that the boat can carry. The weight capacity of a boat is just as important and sometimes more important than the boat size. However in most cases the weight capacity of a boat will increase with the boat size.

There is certainly a difference in the initial cost of a carburetted 2-stroke compared to a 4-stroke with prices for the nine 90hp engines we reviewed varying from NZ7995 for a 2-stroke Parsun T90 through to NZ20789 for the new V4 direct injected 2-stroke Evinrude ETEC 90 HO. How to Choose the Right Size Outboard Engine - YouTube. Generally short shaft outboards are 15 inches long shaft outboards are 20 inches and extra-long outboards are 25 inches.

Since the length of the shaft of your outboard is associated with the size boat smaller engines will generally have shorter shafts.