MIL-DTL-2845E (SH)
securely suspended between the ends of the box by use of nominal
2- by 10-inch members securely cleated to the inside of the box
ends. The size of the box shall ensure not less than approximately
1 inch clearance on top, sides, and ends. Boxes greater than 48
inches long shall be provided with an intermediate saddle midway
between the ends which firmly supports the tie bolt from all
sides. The saddle support shall be securely attached to the sides,
top, and bottom of the box. Suitable blocking which will not
injure or mar the blades shall be provided to prevent propellers
from turning on the tie bolt. Boxes shall be provided with skids
in accordance with the applicable box specification. The gross
weight of each box shall be not greater than 600 pounds.
(b)
Individual packs.
(1)
Propellers shall be packed in wood boxes in accordance with
PPP-B-621, class 2, style 2 (reinforced), type 3 load as
shown on figure 5. Wood materials utilized for container
construction shall be as specified in 3.8.2.2 for multiple
trip use. Box components shall be joined by corrosion-
resistant (stainless steel) screws. Blocking shall be cut
from nominal 2- by 6-inch or 2- by 8-inch lumber with a
minimum 10-inch length. Blocking shall be cut in pairs with
the angle of cut in conforming to the blade angles as shown
on figure 6. Blocks shall be covered with at least three
thicknesses of type 1, grade A, class 2 material in
accordance with MIL-B-121 at areas of contact with the
blades.
(2)
When specified (see 6.2), propellers shall be individually
packed in corrugated fiberboard boxes in accordance with
ASTM D 5118, class weather-resistant, full overlap style as
shown on figure 7. Blocking, bracing, and fillers shall be
of the same material as the box except liners at blade
contact area shall be solid fiberboard. Fillers, as
required, shall be used under and over the hub areas and cut
to fit snugly within the blocking sleeve. Propeller edges
and finished faces of the hub shall be covered with barrier
material in accordance with type I, grade A, class 2 of MIL-
B-121. Interior blocking, bracing, and fillers as shown on
figure 7 shall be used for two- and three-bladed propellers.
Boxes shall be closed in accordance with sealing method B
or C of ASTM D 1974.
3.14.2.2.2 Propellers, 30 to 60 inches in diameter. Propellers shall be
individually packed in wood boxes in accordance with PPP-B-621, class 2, style
2, (reinforced), type 3 load as shown on figures 8 and 9. Wood materials
utilized for container construction shall be as specified in 3.8.2.2 for
multiple trip use. Box components shall be joined by corrosion-resistant
(stainless steel) screws. Joists shall span the box width. Table II specifies
joist sizes, as required, for various loads and spans. The joist supports
shall be at least 2 inches wider than the depth of the joists, for example 2-
by 4-inch joists require a 2- by 6-inch support.
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