Download X-Array - Flying Manual and Structural Ratings

X-Array™ Loudspeaker Systems
mathematical calculations. All of these forces
must then be compared to the working-load limits
detailed below for each of the rigging points and
the overall enclosures. The reader should consult
an experienced structural engineer to perform the
complex structural analysis. WHEN SUSPENDING ANY X-ARRAY™ LOUDSPEAKER SYSTEM
OVERHEAD, THE WORKING-LOAD LIMITS
MUST NEVER BE EXCEEDED FOR EACH INDIVIDUAL RIGGING POINT, AND THE OVERALL
ENCLOSURE.
Rear Rigging Structural-Strength Ratings: The
working-load limit of each individual rigging point
on the rear of an X-Array™ enclosure is dependent upon the rigging-track/bracket assembly as it
is mounted in the enclosure, the specific removable rigging-hardware assembly and the angle of
pull. The structural-strength ratings for the Xrhg
grid hinge, Xrhp pickup hinge, Xrhl linking hinge
and New Haven NH32102-2 fitting are shown in
Figure 20.
The Xrhg grid and Xrhp pickup hinges have identical structural-strength ratings, as shown in
Figure 20a. It should be noted that the front-toback-angle range is only 270° because the hinge
chains can only be put into tension and the enclosure prevents a full 360° rotation. It also should
be noted that the Xrhg grid and Xrhp pickup
hinges are rated only to be used over side-to-side
pull angles of a maximum of ±10° as shown in
Figure 20a. The front-to-back ratings are valid
over the entire side-to-side range of ±10°.
+α
The front-to-back structural-strength ratings for
the Xrhl linking hinges shown in Figure 20b cover
a full 360° rotation. Although it is not possible to
put the hinge into tension over 360°, it is possible
for the linking hinges to go into compression when
pull-up straps are employed. Therefore, the 360°
rating is necessary to accommodate both tension
and compression. It also should be noted that the
Xrhl linking hinges are rated only to be used over
side-to-side pull angles of a maximum of ±5° as
shown in Figure 20b. The front-to-back ratings are
valid over the entire side-to-side range of ±5°.
The structural-strength ratings for the New Haven
NH32102-2 fitting, shown in Figure 20c, do not
vary with the angle of pull both side to side and
front to back. Therefore, only a single rating is
stated instead of a graph showing variations with
angles.
It should be clarified that all of the structuralstrength ratings shown in Figure 20 are for a
single rear rigging point. There are, however, two
rear rigging points on the enclosure – each having the structural-strength ratings shown in
Figure 20. The rear rigging strength ratings are
identical for all of the X-Array™ loudspeaker
model enclosures.
Front Rigging Structural-Strength Ratings:
The working-load limit of each individual rigging
point on the front of an X-Array™ enclosure is dependent upon the rigging-track/bracket assembly
as it is mounted in the enclosure, the New Haven
NH32102-2 double-stud fitting and the angle of
−α
α
α
+β
−β
β
β
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