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|  MIL-R-24661(SH)
3.3 Design.
3.3.1 Ring buoy. The ring buoy shall be ring or horseshoe shaped with
an inside diameter of 15 + 1/2 inches and an outside diameter of 25 + 1/2 inches.
If the buoy is horseshoe shaped it shall have a strap system for closing the
open end of the buoy.
3.3.2 Plastic shell. In its uninflated state, the ring buoy shall be
encased in a durable plastic shell that shall withstand the drop test specified
in 4.6.4. The plastic shell shall have a maximum length of 12 inches and a
maximum diameter of 4.5 inches (see figure 2). The plastic shell shall be
attached to the buoy by a cord 16 inches long to act as sea anchor.
3.4 Construction. Air retaining seams in the ring buoy and attachment of
all other parts to the ring buoy shall be constructed by heat sealing.
3.4.1 Sealed areas. The construction of heat sealed seams and the attach-
ment of all parts shall utilize techniques and precautions to develop optimum
properties of sealed areas as specified in MIL-C-83489.
3.5 Rsistance to damage. There shall be no damage experienced by either
the outer shell or the ring buoy when subjected to a drop test, as specified in
4.6.4.
The encapsulated ring buoy shall be vibrated as specified
3.6 Vibration.
in 4.6.5.
3.7 Buoyancy. The ring buoy shall have a minimum buoyancy of 20 pounds
when tested as specified in 4.6.6.
3.8 Weight. Total weight of the ring buoy encapsulated in the plastic
shell shall not exceed 2.5 pounds.
3.9 Shelf life. The packaged, encapsulated ring buoy shall have a minimum
shelf life of 5 years.
3.10 Color. Unless otherwise specified (see 6.2.1), the coated cloth and
plastic shell color shall be fluorescent orange, in accordance with FED-STD-595,
color chip number 38903.
3.11 Marking. Identification markings shall be made by the silk screen
method in letters and numerals 1/4 inch high. The ink shall be a contrasting
color, waterproof, and cause no deterioration of fabric.
3.11.1 Identification.
The identification shall consist of the name of the
item, serial number, the name
or trademark of the manufacturer, date of manufac-
ture (month and year) and the
contract number. The identification shall be
located inside the protective
package and on the ring buoy.
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