Outboard motors

Outboard motors

Internal Combustion Engines

Published in Don M. Pirro, Martin Webster, Ekkehard Daschner, Lubrication Fundamentals, 2017

Don M. Pirro, Martin Webster, Ekkehard Daschner

The majority of outboard motors that were used for recreational boats were historically two-stroke gasoline engines. In recent years, this has changed with approximately 70% of new outboard motor sales being four-stroke engines. The four-stroke outboards are claimed to produce lower emissions, have better fuel economy, and are considered smoother and quieter than two-stroke outboards. Two-stroke outboard claims include having better acceleration, being lighter in weight, are easier to repair, and are often less expensive to purchase.

Whale rover moving along the surface of sperm whale

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Journal Information

Published in Advanced Robotics, 2019

Kosuke Tsuchiya, Yuichi Tsumaki, Kyoichi Mori, Ryosuke Okamoto

The length, width, and height of the water tank were 2500, 1150, and 1200 mm, respectively. An outboard motor (Minnkota Endura Max 40) was used to generate water flow using a propeller. The rotation speed of the propeller could be freely adjusted. A curved acrylic surface measuring 600×400 mm with a 1.5 m radius was mounted on an aluminum frame base and positioned in front of the outboard motor's propeller. Figure 14 shows the curved acrylic surface mounted on the aluminum frame base. Again, a flexible and lightweight fishing lines tethered the whale rover prototype to the aluminum frame if the suction cups failed to adhere to the curved acrylic surface. The length of the fishing lines was adjusted so that the prototype did not make contact with the outboard motor or tank wall.

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Internal Combustion Engines

Whale rover moving along the surface of sperm whale