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The water caterpillar boat propulsion system (Popular Science Monthly, December 1918) An early uncommon means of boat propulsion was the water caterpillar. This moved a series of paddles on chains along the bottom of the boat to propel it over the water and preceded the development of tracked vehicles. [34]
Over time, as most engines became direct-acting but cylinder technologies grew more complex, engines began to be classified solely according to cylinder technology. More commonly encountered marine steam engine types are listed in the following sections. Note that not all these terms are exclusive to marine applications.
The clipper sailing ship Dunedin, owned by the New Zealand and Australian Land Company (NZALC), was refitted in 1881 with a Bell-Coleman compression refrigeration machine. This freezer unit worked by compressing air, then releasing it into the hold of the ship. The expanding air absorbed heat as it expanded, cooling the cargo in the hold.
A standard lightweight, moderate-speed bicycle is one of the most energy-efficient forms of transport. Compared with walking, a 64 kg (140 lb) cyclist riding at 16 km/h (10 mph) requires about half the food energy per unit distance: 27 kcal/km, 3.1 kWh (11 MJ) per 100 km, or 43 kcal/mi. [ 15 ] This converts to about 732 mpg ‑US (0.321 L/100 ...
The MOD II project in 1980 produced one of the most efficient automotive engines ever made. The engine reached a peak thermal efficiency of 38.5%, compared to a modern spark-ignition (gasoline) engine, which has a peak efficiency of 20–25%. The Mod II project replaced the normal spark-ignition engine in a 1985 4-door Chevrolet Celebrity ...
The most appealing part of this research is how potentially energy efficient and environmentally friendly this cooling technology is. The different materials used, commonly shape-memory alloys, provide a non-toxic source of emission free refrigeration. The most commonly studied materials studied are shape-memory alloys, like nitinol and