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CODE OF FEDERAL REGULATIONS – TITLE
33 – NAVIGATION AND NAVIGABLE WATERS
PART 183—BOATS AND ASSOCIATED EQUIPMENT
Subpart G—Flotation Requirements
for Outboard Boats Rated for Engines of More Than 2 Horsepower
Source: CGD 75-168, 42 FR 20243,
Apr. 18, 1977, unless otherwise noted.
GENERAL
Sec. 183.201—Applicability
(a) This subpart applies to monohull outboard
boats that are:
(1) Less than 20 feet in length; and
(2) Rated for outboard engines of more than
2 horsepower.
(b) This subpart does not apply to sailboats,
canoes, kayaks, inflatable boats, submersibles, surface effect
vessels, amphibious vessels, and raceboats.
[CGD 75-168, 42 FR 20243, Apr. 18, 1977,
as amended by USCG-1999-5832, 64 FR 34716, June 29, 1999]
Sec. 183.202—Flotation and certification
requirements
Each boat to which this subpart applies must
be manufactured, constructed, or assembled to pass the stability
and flotation tests prescribed in Secs. 183.225(a), 183.230(a),
and 183.235(a).
Sec. 183.205—Passenger carrying area
(a) For the purpose of this section a boat is
level when it is supported on its keel at the two points shown
in Figure 2.
(b) As used in this subpart, the term “passenger
carrying area” means each area in a boat in which persons
can sit in a normal sitting position or stand while the boat
is in operation. Passenger carrying areas are illustrated
in Figures 3 through 8.
(c) The length of the passenger carrying area
is the distance along the centerline of the boat between two
vertical lines, one at the forward end and one at the aft
end of the passenger carrying area when the boat is level
as illustrated in Figures 3 and 4. For boats with a curved
stem inside the passenger carrying area, the forward vertical
line is where a line 45 degrees to the horizontal when the
boat is level is tangent to the curve of the stem, as illustrated
in Figure 5. For boats with cabins, the forward vertical line
is where there is a minimum distance of two feet between the
inside top of the cabin and the water line formed when the
boat is swamped and loaded with weights under Sec. 183.220
as illustrated in Figure 6.
(d) The breadth of each passenger carrying area
is the distance between two vertical lines at the mid-length,
excluding consoles, of the passenger carrying area when the
boat is level as illustrated in Figures 7 and 8. For boats
with round chines inside the passenger carrying area, the
vertical line is where a transverse line 45 degrees to the
horizontal is tangent to the arc of the chine, as illustrated
in Figure 8.
[CGD 75-168, 42 FR 20243, Apr. 18, 1977,
as amended by USCG-1999-5832, 64 FR 34716, June 29, 1999]
Sec. 183.210—Reference areas
(a) The forward reference area of a boat is
the forward most 2 feet of the top surface of the hull or
deck, as illustrated in Figure 9.
(b) The aft reference area of a boat is the
aft most two feet of the top surface of the hull or deck,
as illustrated in Figure 9.
Sec. 183.215—Reference depth
Reference depth is the minimum distance between
the uppermost surface of the submerged reference area of a
boat and the surface of the water measured at the centerline
of the boat, as illustrated in Figure 10. If there is no deck
surface at the centerline of the boat from which a measurement
can be made, the reference depth is the average of two depth
measurements made on opposite sides of, and at an equal distance
from, the centerline of the boat.
Sec. 183.220—Preconditioning for tests
A boat must meet the following conditions for
at least 18 hours before the tests required by Secs. 183.225,
183,230, and 183.235:
(a) Manufacturer supplied permanent appurtenances
such as windshields and convertible tops must be installed
on the boat.
(b) The boat must be loaded with a quantity
of weight that, when submerged, is equal to the sum of the
following:
(1) The sum of 50 percent of the first 550
pounds of the persons capacity marked on the boat and 12-1/2
percent of the remainder of the persons capacity.
(2) Twenty-five percent of the result of the
following calculation, but not less than zero: The maximum
weight capacity marked on the boat; less the weight shown
in Column 6 of Table 4 for maximum horsepower marked on
the boat; less the persons capacity marked on the boat.
(c) The weights required by paragraph (b) of
this section must be placed in the boat so that the center
of gravity of each amount of weight required by paragraphs
(b)(1) and (b)(2) of this section is within the shaded area
illustrated in Figure 11. The location and dimensions of the
shaded area are as follows:
(1) The shaded area is centered at the
mid-length of the passenger carrying area and at the mid-breadth
of the boat;
(2) The length of the shaded area, measured
along the centerline of the boat, is equal to 40 percent
of the length of the passenger carrying area of the boat;
and
(3) The breadth of the shaded area,
measured at the midlength of the passenger carrying area,
is equal to 40 percent of the breadth of the passenger carrying
area of the boat.
(d) Weight must be placed in the normal operating
position of the motor and controls and the battery in lieu
of this equipment. The required quantity of weight used for
this purpose depends upon the maximum rated horsepower of
the boat being tested and is specified in Columns 2 and 4
of Table 4 for the swamped weight of the motor and controls
and for the submerged weight or the battery, respectively.
(e) Permanent fuel tanks must be filled with
fuel and each external opening into the fuel tank must be
sealed.
(f) The boat must be keel down in the water.
(g) The boat must be swamped, allowing water
to flow between the inside and outside of the boat, either
over the sides, through a hull opening, or both. Entrapped
air in the flooded portion of the boat must be eliminated.
(h) Water must flood the two largest air chambers
and all air chambers integral with the hull.
[CGD 75-168, 42 FR 20243, Apr. 18, 1977,
as amended by USCG-1999-5832, 64 FR 34716, June 29, 1999]
Sec. 183.222—Flotation material and
air chambers
(a) Flotation materials must meet the requirements
in Sec. 183.114 as listed in Table 183.114 when used in the
bilge, unless located in a sealed compartment.
(b) Air chambers used to meet the flotation
requirements of this subpart must not be integral with the
hull.
[CGD 77-145, 43 FR 56859, Dec. 4, 1978;
44 FR 47934, Aug. 16, 1979]
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