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470 hp 7.5 kW/kg 4.55 hp/lb Electric Vehicle ElectriFly GPMG5220 brushless DC motor [37] 0.133 kg 0.29 lb 1.035 kW 1.388 hp 7.78 kW/kg 4.73 hp/lb Radio-controlled aircraft: Remy HVH250-090-POC3 brushless DC motor [38] 33.5 kg 74 lb 297 kW 398 hp 8.87 kW/kg 5.39 hp/lb Electric vehicles: TP POWER TP100XL brushless DC motor [39] 7 kg 15 lb 75 kW
The first known outboard motor was a small 11 pound (5 kg) electric unit designed around 1870 by Gustave Trouvé, [9] and patented in May 1880 (Patent N° 136,560). [10] Later about 25 petrol powered outboards may have been produced in 1896 by American Motors Co [ 9 ] —but neither of these two pioneering efforts appear to have had much impact.
Illustration of bearing tolerances (in micrometers) for a bearing with a 20 mm inner diameter. For illustration, the figure shows the differences in tolerance per ABEC class in micrometers (μm) for a 20 mm inner diameter bearing. [1] A 20 mm ABEC 7 bearing only has a 5 μm tolerance window, whereas an ABEC 1 has twice as wide a tolerance.
A ball bearing. A bearing is a machine element that constrains relative motion to only the desired motion and reduces friction between moving parts.The design of the bearing may, for example, provide for free linear movement of the moving part or for free rotation around a fixed axis; or, it may prevent a motion by controlling the vectors of normal forces that bear on the moving parts.
Fluid bearings generally have very low friction—far better than mechanical bearings. One source of friction in a fluid bearing is the viscosity of the fluid leading to dynamic friction that increases with speed, but static friction is typically negligible. Hydrostatic gas bearings are among the lowest friction bearings even at very high speeds.
The first advanced mechanical means of marine propulsion was the marine steam engine, introduced in the early 19th century. During the 20th century it was replaced by two-stroke or four-stroke diesel engines, outboard motors, and gas turbine engines on faster ships.