my father is on a bicycle tour of Vietnam and Cambodia, his engineer’s eye caught some interesting boat power:

“All of these photos are of a style of boat power where a conventional engine, of varying sizes, is mounted on a pivot with a long drive shaft that runs a propeller. Steering is done by pivoting the whole arrangement. The shafts are so long to both reach the water and to balance the engine so that it it relatively easy to handle.”

one in action

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A regular car engine- The motor and the shaft (heavy steel) are almost in balance so that one person can move it around.
Some are air cooled and others are water cooled, as is this one and you can see the water pipes on the drive shaft because they have no radiator.

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The scoop behind the propeller is how the water is picked up and forced through the motor
A close up of a boat selling us coffee and other goodies
A sequence showing how they steer the boat

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A sequence showing how they steer the boat
A sequence showing how they steer the boat