to span that long of a run, build a truss above it. look at the "red iron" structure in the ceiling of most modern buildings, look at the boom on most wreckers and cranes, this will give you some idea on how to support it. whatever you do, don't stand under it until you have tested it. basically, you need to have a rod coming down to the center from both ends to help carry the load to the end supports. The higher the starting point, from the beam, the more weight it will carry. Think vectors, trig, sine and cosine,etc.
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