21. The boats drift along on a gentle current, typically generated by a paddle wheel . 22. Paddle wheels were on the sides and it had two cranks for propulsion windlass.23. Each had two auxiliary engines driving a paddle wheel , one either side of the ship. 24. The pump is driven by an undershot paddle wheel . 25. Many pedalo boats also use paddle wheels for propulsion. 26. Each rectangle contains a paddle wheel to make the water flow continuously around the circuit. 27. In April 1991, the starboard paddle wheel collapsed, dramatically changing the configuration of the remains. 28. For a paddle wheel ship, reversing the direction of the paddle will provide astern propulsion. 29. Because paddle wheels simply push off the water, their design and construction is very simple. 30. If we place a paddle wheel anywhere, we see immediately its tendency to rotate clockwise.
