If you slow down the speed of the motor this increases the power (torque). The easiest and most reliable but most expensive way to do this is to use a gear box, this takes a fast sped and puts gears either side, the gears are different sizes and therefore different speeds. When an appropriate speed is chosen it would be fixed. Attached to the gear box is a shaft, if the paddle wheel was directly attached to the shaft the motor would be too close to the water, this would be extremely dangerous. To keep it away from the water you use a chain to transfer the power. The chain doesn't stretch although it does corrode. To prevent corrode you could use stainless steel but this would be expensive Another solution would be to use a rubber belt with reinforcement strips inside it although it must be under tension. The down side of this is that there would be a lack of friction which would stop the belt turning. The gear box must be designed to bring the speed down to an appropriate level, to do this you need to go from small clogs to big clogs, the bigger clog/sprocket has more teeth.
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