I have to design a power transmission from a motor to a fan. There are no restrictions on what I design. I'm not sure whether I should use a direct (flexible) coupling, a universal joint, or a belt drive. I have designed a belt drive before, and from looking at catalogues, it looks like it's slightly more complicated and time-consuming than the other options since I'll need bearings, pulleys, belts, spacers, two shafts, keys, keyways, etc. and I can simply use a taper lock with coupling. The housing for a belt drive will also be slightly more complicated. What are the advantages and disadvantages of the different types? I know with belt drives is there is a jam the belt will slip, so there is a safety element in choosing it. What would you recommend? I'm leaning towards either a coupling or a belt drive at the moment. I need to decide on one in a few hours.