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Loading — Subpart C
Category One: Inboard and Sterndrive Boats
FEDERAL LAW
183.33 - Maximum weight capacity:
Inboard and inboard-outdrive boats.
(a) The maximum weight capacity (W) marked
on a boat that has one or more inboard or inboard-outdrive
units for propulsion must not exceed the greater value
of W obtained from either of the following formulas:
| W = |
maximum displacement - |
boat weight - |
4 (machinery weight) |
| |
5 |
5 |
5 |
or
| W = |
(maximum displacement - boat
weight) |
| |
7 |
(b) For the purpose of paragraph (a) of
this section:
(1) “Maximum displacement”
is the weight of the volume of water displaced by
the boat at its maximum level immersion in calm water
without water coming aboard. For the purpose of this
paragraph, a boat is level when it is transversely
level and when either of the two following conditions
are met:
(i) The forward point where the sheer
intersects the vertical centerline plane and the
aft point where the sheer intersects the upper boundary
of the transom (stern) are equidistant above the
water surface or are equidistant below the water
surface.
(ii) The most forward point of the
boat is level with or above the lowest point of
water ingress.
(2) Boat weight is the combination of:
(i) Hull weight;
(ii) Deck and superstructure
weight;
(iii) Weight of permanent appurtenances;
and
(iv) Weight of full permanent
fuel tanks.
(3) Machinery weight is the combined
weight of installed engines or motors, control equipment,
drive units, and batteries.
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NOTE:
Inboard-outdrive and stern drive are synonymous words and
are used here to describe a propulsion machinery system consisting
of an inboard engine installed in conjunction with an outside
drive unit connected to the engine through the transom. An
inboard boat is described as an inboard engine coupled to
propulsion machinery such as a drive shaft and propeller,
a jet pump etc.
Discussion:
The maximum weight capacity rating for a boat under this category
may not be any greater than W in either one of the formulae
above.
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