L-ACOUSTICS ARCS Manual V2.0 2/13/2003 12Figure 8: ARCOUPLBUMP 3, LIFTBARAdditional rigging elements used to fly an ARCS array. BUMP3 is assembled using locking nuts (withcotter pin safeties) and a standard ARCOUPL bar. A shackle is then attached to BUMP3 and used as arigging point for the entire assembly (i.e., single point hang). Ten pick point holes are available onBUMP3, and the pick point is selected according to the center of gravity for the array in order toprovide the desired overall tilt angle. Only one BUMP3 is required for flying an even number ofenclosures (up to 4), whereas two BUMP3 and one LIFTBAR are required for flying an odd number orfor more than 4 enclosures (up to 8). For larger configurations where ARCS is flown in the normal(vertical) orientation, there should be no more than 4 ARCS enclosures (vertically or horizontally)supported by a single BUMP3.The rigging reference chart in Chapter 5 provides a table of array tilt angles for various BUMP3 andLIFTBAR pick point combinations.BUMP3LIFTBARFigure 9: BUMP3, LIFTBAR Rigging Accessories
