15
Jan
All inboard and outboard boats under 20 feet in length must have a maximum capacity listed in both persons and pounds stamped or printed on a clearly visible plaque. If your boat with all gear is heavier it will take more HP to plane.
Plug in your info and click Calculate on the item you want to compute.
Where can you find the maximum horsepower for your boat. You can check the capacity plate of your boat as an initial step. This plate is on the steering area helm or in front of the captain. Federal law requires vessels that are over 20 feet long to have this capacity plate.
It bears the maximum gross load allowed. Boat length x boat width boat square footage First find out the square footage of your boat by multiplying its length by the width of the transom. Then use our calculator and the table here to find out your boats maximum horsepower.
Be aware of the federal regulations for your boats engine power horsepower and gross load capacity maximum weight. According to federal law motorized boats that are less than 20 feet in length must have a capacity plate in the steering or helm area. The capacity plate is where you can you find the maximum horsepower for your boat.
Here you also find the maximum weight and size of engine. Use this Boat Horsepower Calculator to estimate the power required to efficiently move your skiff. See the article Do You Really Need That Much Power.
Your boats capacity plate will include the following information. The maximum passenger weight in lbs and the equivalent number of adult passengers. The total maximum weight in lbs including the gear the engine and the total number of persons or the total amount of passenger weight.
The recommended maximum horsepower capacity. All inboard and outboard boats under 20 feet in length must have a maximum capacity listed in both persons and pounds stamped or printed on a clearly visible plaque. In addition there must be a maximum horsepower shown for the engine on outboard boats.
But there are likely to hold several surprises for boat owners and buyers. Locate the National Marine Manufacturers Association Certification Plate on the inside of the stern of the boat. The NMMA plate contains important information which you should know including the number of people the boat can carry and the horsepower rating of largest motor you should use.
All boats are required to have a maximum HP rating and this can usually be found on a plaque located on the vessel. If you plan on going to a larger than stated maximum horsepower you will be doing so at your own risk and should proceed with caution. Which specific type of engine you end up with will depend largely on the type of watercraft and the areas in which youll be sailing.
Horsepower can range anywhere from 25 hp all the way up to over 1000 hp for certain types of outboard motors. If the Factor is over 525 and the boat has. Remote Steering and at least 20 Transom Height.
HP 2 x Factor -90. No remote steering or less than 20 transom Height. For flat bottom hard chine boats.
HP 05 x Factor -15. For other boats. HP 08 x Factor -25.
Since this forum is more based towards pontoon houseboats than pontoon boats you may have better luck finding specific details by emailing the manufacturer directly. Well you know but power-to-weight ratio is a legitimate number and knowing the figure for your boat can help you increase its efficiency or speed depending on what youre looking for. Its a straightforward calculation that can be done in horsepower per pound or vice versa.
The max horsepower listed on the plate is arrived at by a formula that factors in the boats length and transom width. Also on the tag are max limits for the number of people and weight the boat is allowed to carry. The capacity plate can usually be found inside the transom or for boats with a steering console near the wheel.
The rated horsepower may be rounded up to the nearest 5. Here is an example of how the rating formula works in practice applied to an older Boston Whaler boat the V-20 model. Boston Whaler V-20 Length 19 10 Width 7 5 Thus.
1983 x 742 x 2 - 90 20415 Rounding up 205 maximum rated horsepower. The maximum load capacity on compliance notice refers to the total weight that the craft can hold in order to navigate safely. Remember that this information applies only in good weather.
The number of people who can be carried safely depends on the type of boat where people and equipment are carried and weather and water conditions. Operators must know and respect their boats limits. So you could say the same thing for your boats engine.
Once you hit the 3-4K hour range. You can brag about how many hours you have racked up on the water. Now that you know all there is to know about boat engine hours.
Here are some other articles that you will find. Take your boat weight and divide by 50. So a 1000 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.
The calculator below uses the above formula. Plug in your info and click Calculate on the item you want to compute. By using known values for the weight power and speed you can come up with a more accurate constant for your boat.
You can then see what effect changes to. Coast Guard Federal Boat Safety Act of 1971 boats less than 20 feet powered with an inboard outboard or stern drive engine manufactured after November 1 1972 must display a capacity plate defining the safe load limits. This plate must be mounted where you can see.
Smallboats dead on IMO. That Coast Guard capacity plate will tell you exactly how much weight as well as maximum horse power your boat is rated for. Checking Starcrafts website I see they have a 165 tin rated for 1100 lbs not sure if your boat is similar but it wouldnt surprise me if the boat is structurally sound.