MIL-DTL-2845E (SH)
TABLE II. Sizes of double joists require to support
propellers in a wood box.
Weight of
Size of joists1/ required for span of:
propeller
(pounds)
30
36
42
48
54
60
(inches)
(inches)
(inches)
(inches)
(inches)
(inches)
Up to 400
Two 2 by 4
Two 2 by 4
Two 2 by 4
Two 2 by 4
Two 2 by 4
Two 2 by 6
400 to 600
Two 2 by 4
Two 2 by 4
Two 2 by 4
Two 2 by 6
Two 2 by 6
Two 2 by 6
l/
Joists are used in pairs as shown.
Propellers greater than 600 pounds shall be packed in a container consisting
of a skid type base and a container cover as shown on figure 10. The skid base
and member sizes shall conform to MIL-C-104. The container cover shall be a
modified class 2, style 2 (reinforced), type 3 load box in accordance with
PPP-B-621 consisting of ends, sides, and a top. The ends of the cover shall
become the sides and shall be fastened to the base skids. The sides shall
become the ends and shall be fastened to the base headers. The cover ends
(sides) shall be reinforced on the interior with nominal 1- by 4-inch battens
and diagonals. A blot spacing member supported by side bracing members of not
less than nominal 2- by 10-inch lumber extending the full width of the box
shall be screwed to the top and bottom of the box, midway between the ends.
The cover shall be attached to the skid type base by hex-head, corrosion-
resistant (stainless steel) screws to permit ready removal and installation.
The hub of the propeller shall be fitted with a suitable wood cone with
drilled centers to fit a suitable 3/4-inch tie bolt on which the propeller
shall be strung. The 3/4-inch tie bolt shall be suspended between the 2- by
10-inch bolt spacing members. A hole shall be drilled in the sheathing, top,
and bottom to accommodate the bolt head and nut, so that counter-sinking will
not be necessary in the bolt spacing member. The size of the box shall ensure
not less than approximately 2 inches clearance on top, sides, and ends.
Blocking which will not injure or mar the blades shall be provided to prevent
the propeller from turning on the tie bolt. Boxes shall be strapped in
accordance with PPP-B-621.
3.14.2.2.3 Propellers, 60 to 108 inches in diameter. Propellers, 60 to
108 inches in diameter shall be individually packed in an open-type crate with
a skid-type base as shown on figures 10, 11, and 12 . Container (cover and
base) member sizes, fastening, and assembly shall be in accordance with MIL-C-
3774, MIL-C-104, or ASTM D 6039, as applicable, except all components shall be
fastened with corrosion-resistant (stainless steel) screws. Wood materials
utilized for crate construction shall be as specified in 3.8.2.2 for multiple
trip use. The crate size shall allow not less than 4 inches of clearance
between the propeller and the interior surfaces of the container top, sides,
and ends. The maximum size propeller packed in a crate shall not exceed the
common carriers' dimensions for such cargo. When crates exceed rail shipment
limitations, propellers shall be shipped uncrated and in accordance with the
requirements for propellers greater than 108 inches in diameter (see
3.14.2.2.4). The base of the crate shall be reinforced with at least 6- by 10-
inch wood, load-bearing members. Blocking that will not mar or injure the
blades, protective coating, or edge guards shall be provided to prevent
propeller movement and shifting within the crate during handling, shipment,
and storage.
3.14.2.2.4 Propellers greater than 108 inches in diameter.
Propellers
greater than 108 inches in diameter do not require packing.
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