I have a winch to build. This winch has 5 drums spaced equally over a 40' length. They are connected by a common shaft of 2" solid bar. In the center of the shaft/drum assembly is a gear motor turning the shaft. Attached to the wire rope coming down from the 8" dia. grooved drums is a 40' aluminum I-beam. This ibeam will be supporting trolley that will roll along the ibeam. The weight to be lifted is 3500lbs (after a 5:1 safety factor is included) and needs to travel 17' in about 4 seconds. My question is how to figure out the horsepower needed to lift this much weight, assuming a gear reducer of 30:1 after the motor. Motor is turning max rpm of 3500. Also need to figure the amount of torque needed to hold the load in the air safely. Is it safe to assume all 5 drums will be doing the same amount of work, regardless of the placement of the rolling trolley? (I would think not.) Is it also safe to assume that the amount of torque needed to LIFT the weight is the same as the amount of torque needed to sustain the load in a static state? (Hope I said that right.) I guess what I'm looking for are the formulas to figure these out, not neccassarily the answers to the questions. Thanks!