Quantcast Overhead Baffles (OS)

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MIL-HDBK-1027/3B
Change 1, 30 June 1995
c)  Wing Walls.  Wing walls (side baffles) are discontinuous side
protection set at 45 degrees to the line of fire.  Locate the wing walls such
that they are overlapped by 0.15 meter based on any line of fire that may
strike the wing walls.  Construct of ballistic material.  Provide sacrificial
cladding on wing walls closer than 10 meters to the FL.  Wing walls assist
cross range ventilation.
d) End Walls.  May be constructed at the firing lane edge on the FL
in lieu of side containment extending 1.0 meter behind the FL.  Walls shall be
long enough to close off any line of sight between the end of the side
containment and the rear 1 meter mark.  The end walls shall be constructed of
ballistic material with sacrificial cladding extending from the canopy to the
FLFS.
2.2.11.3 Overhead Baffles (OS).  The lowest elevation of the bottom of an OB
shall be plus 0.15 meter above the ULF (plus 2.0 meters, FLFS).  The OB shall
be located such that no direct fire can exit the range from any firing
position (LLF usually is the controlling position). The first OB shall be
geometrically coordinated with the firing line ballistic canopy (par.
2.2.11.1.b).  The top elevation of the top of each following baffle shall be
0.15 meter higher than a line of fire that just clears beneath each preceding
baffle.  OB should be the same height; space them apart down range to achieve
the required geometry.  The last baffle shall be placed such that the line of
fire will strike the impact structure (par. 2.2.11.4) no higher than 1.5
meters below the top elevation of the structure.  See Figure 2.2-9 for profile
guidance.  On a Type "FB" range, the last OB shall be over the last target
line.
a)  The OB shall extend laterally to within 0.3 meter of the side
containment (par. 2.2.11.2). On Type "FB" ranges the OB shall tie into the
side containment.
b) The vertical dimension of a OB when it is vertical varies with
the number and spacing of the baffles.  Normally the height is between 1.25
and 2.5 meters when considering structural support size and costs.
c) The baffles shall be constructed of ballistic material (par.
2.2.11.7).  Baffles within 10 meters of the FL shall be covered with
sacrificial cladding.  See Figure 2.2-10 for possible configurations.
d) Space the structural columns as far apart laterally as possible
to open firing lanes.  If possible do not construct columns within the range.
Design columns or beams to withstand local wind and seismic loads.  Provide
protective steel plate on the faces of the columns exposed to the FL in
accordance with Figure 2.2-10.  Provide sacrificial cladding if the column is
within 10 meters of the FL.
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