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Belt drives offer a different set of challenges. They allow you to "gear up" and "gear down" motor speeds like gears, but all the shafts rotate in the same direction. This works well if you want to drive two props off one motor in the same direction. They are susceptible to foreign materials like gears as well. Another problem that crops up is slippage. You need to put a higher tension on the belt to keep it from slipping, but that puts increased stress on the shafts. One way to get around this is to use a belt with teeth on it, but then you need to find matching pulleys.
One word of caution while o-rings are cheap they will only work well for a few hours. They have low tensile strength, which causes them to wear out quickly when stretched around the outside of a pulley.
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