On outboard boats the capacity plate provides a horsepower rating

You multiply your boat length by the transom width. If your boat is slightly larger or wider than 19 or 6 then you can try using the decimal portion to justify a slightly higher HP or Max person capacity.

By onthewater102 01 Aug 2014 2200.

On outboard boats the capacity plate provides a horsepower rating. How is boat horsepower rating calculated. You multiply your boat length by the transom width. Then you take that number which is known as the factor and match it to a horsepower capacity according to the Code of Federal Regulations Table 18353 Outboard Boat Horsepower Capacity shown below.

Why do boats have a max hp rating. What Does the Horsepower Rating on an Outboard Boat Mean. On outboard boats the capacity plate provides a horsepower rating.

What does this rating mean. The horsepower rating on an outboard boat is based on the maximum amount of power that engine can produce. The more horsepower the faster your boat will go.

But with high-horsepower engines comes higher fuel costs. The Horsepower rating on an outboard boats capacity plate means the number of people that a boat can hold or the maximum capacity it can carry. In most outboard boats you can find the horsepower rating on the capacity plate.

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.

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.

On outboard boats the capacity plate provides a horsepower rating. What does this rating mean. The boats motor should not have higher horsepower than this rating.

Finally the Capacity Plate will also indicate the maximum engine power for your boat given in horsepower. This number applies only to boats powered by outboard engines. And it must never be exceeded.

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. Take five times the safe load to sink the boat or seven times the load capacity to sink the boat. The persons capacity measured in weight and in number of people is then determined based on the maximum weight capacity.

On outboard boats the weight of the engine the battery the controls and a full portable 6 gal fuel tank if one is. In terms of hp rating I believe pre-mid eighties hp was measured at the shaft and thereafter was measured at the prop. There was about a 15 loss from shaft to prop so for older outboards their actual rating would be about 15 less than modern outboards eg.

An older 25hp is about equivalent to a 21-22hp by modern standards. 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.

The maximum persons and the maximum persons by weight in pounds. The maximum capacity for persons and gear by weight will also be listed. The plate will also display the recommended maximum horsepower rating for outboard-powered boats.

Below that information is the boat manufacturer name city and state of origin. On outboard boats the capacity plate also will display the recommended maximum horsepower rating of the boat. Your boats motor should never exceed this rating.

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. Your Boats Gross Load Capacity and Horsepower Recommendations You must 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. A capacity plate is mounted on each boat. The capacity plate states the maximum load your boat can carry and the motors maximum horsepower.

Give yourself an added margin for safety in turbulent waters. On outboard boats the plate shows the maximum recommended horsepower for. A maximum horsepower rating is only required on outboard powered monohull boats less than 20 in length.

Inboardoutboards and inboards are not required to have any rating at all. Boats more than 20 in length are not required to have a rating either though Whaler. Maximum Outboard Horsepower Capacity Guide and how-to Post.

By onthewater102 01 Aug 2014 2200. I can find only govern marking the max HP on the tag on the boat - it provides nothing to do with installing a motor in excess of that amount. 18353 Horsepower capacity.

Certain states have laws against exceeding the max horsepower rating of the boat. I live in Ohio and you will get a ticket if caught. Capacity Plates ORC 154739 ORC 1547-40 No person shall operate or permit operation of a watercraft in excess of any of the stated limits on the capacity plate.

Will dealers or service shops install an engine that exceeds the maximum rated horsepower for a boat. It is not unusual for a dealer to decline to install an outboard motor on a boat where the motor exceeds the horsepower shown on the rating plate. This seems to be fairly common practice particularly if the dealer is also selling the boat.

So 19 x 6 114 15 76 7 person capacity. If your boat is slightly larger or wider than 19 or 6 then you can try using the decimal portion to justify a slightly higher HP or Max person capacity. Example 19ft 4 inches would be 1933 feet etc.

Hope this helps Geeco.