Safe Loading — Subpart C

Category Two: Outboard Boats

Example of Calculations for Maximum Weight Capacity and Persons Capacity

In section 4.2 we have an example of the calculations for maximum displacement using a form for the Simpson’s Rule formula. In that example we arbitrarily assumed it was an outboard boat, simply because Figure 3 in section 4.0 pictures an outboard boat. The only difference from the sterndrive boat noted in section 5.3 as an example for the capacity calculations is that the outboard boat has a small volume of the engine well, below the float-plane and forward of the transom, which must be deducted when figuring cubic capacity; hence the displacement for the sterndrive boat was 11,731.2 lb. For the present example of an outboard boat we will use the displacement shown in Figure 5, or 11,668.8 lb.

Following are the specifications for our hypothetical outboard boat:

We measured the hull, applying Simpson’s Rule, and we came up with the displacement (shown in Figure 5, section 4.2) of 11,668.8 lb. Now we will follow the steps of the regulation’s formulae.

Step 1: Compute maximum displacement
Done in Figure 5 = 11,668.8 lb.

Step 2: Compute maximum weight capacity

W = 2,063.16 lb., rounded down to 2,063 lb.

This is the figure that may be used on the capacity label to certify the boat:
2,063 pounds, persons, motor, gear

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