Imagine that the load is almost at the end of the jib. ![]() In addition- the weight of the load is transferred more efficiently in a luffer than in a tower crane. With the jib at a high angle, the working radius (how wide the jib and counter jib) might be as little as 20-30 ft. You need a crane that can fit in this tight space and still lift heavy loads. A regular tower crane might have a jib that’s 200 ft long, and maybe the distance between the buildings is only 50 ft. Let’s say the job site is in an area with buildings on all sides. To lift the load there’s a windlass ( the line wraps around the shaft which is connected to the blue wheel) and another windlass to “luff” the jib. In my version the slewing ring (I use a heavy duty lazy susan) is at the base of the tower. And the whole assembly can slew(rotate) at the top of the tower. ![]() ![]() ![]() The boom/jib can pivot up or down- that’s what luffing means.
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