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Loading — Subpart C
Category One: Inboard and Sterndrive Boats
Example of Calculations for Maximum Weight
Capacity and Persons Capacity of Inboard and Sterndrive (Category
One)
Let’s use the hypothetical outboard boat
described in section 4.2 above, but converting the boat to
a sterndrive. The specifications will read as follows:
| Boat
type |
Sterndrive
runabout |
| Length
over all (LOA) |
16.5 ft |
| Calculation
length |
16.2 ft. (194.2 in.) |
| Beam |
6.75 ft. |
| Calculation
beam |
6.5
ft. (78.75 in.) |
| Horsepower
engine |
120 HP (factory-installed) |
| Boat
weight (dry) |
700
lb. |
| Full,
permanent fuel tank |
150 lb. |
| Boat
weight (per regulation) |
850
lb. (See definition of boat weight above) |
| Engine
& drive weight |
845 lb. |
| Battery
weight |
45
lb. |
| Machinery
weight |
890 lb. (See definition
of machinery weight) |
| Displacement |
188 cubic feet or 11,731.2 lb. |
We measured the hull mold, we applied Simpson’s
Rule, and we came up with the displacement shown at the end
of Figure 5 in section 4.2. The displacement above 11,731.2
lb., was a calculated one as opposed to one measured by immersion.
(For this calculation we use the formulae as stated above
in section 5.1.) The displacement is slightly different from
the one in the example for the maximum displacement calculation.
The boat in the present example, being a sterndrive, does
not have an outboard well and therefore no volume needs to
be added or subtracted. The cubic capacity would be 188 cubic
feet.
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