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In rowing, oars are used to propel the boat. Oars differ from paddles in that they use a fixed fulcrum to transfer power from the handle to the blade, rather than using the athlete's shoulders or hands as the pivot-point as in canoeing and kayaking. An oar is often referred to as a "blade" in the case of sweep oar rowing and as a "scull" in the case of sculling. Typical sculling oars are around 284 cm - 290 cm in length, while rowing oars are 370 cm - 376 cm long. The shaft of the oar ends with one flat end about 50 cm long and 25 cm wide, called the blade. A sculling oar is shorter and has a smaller blade area than the equivalent sweep oar. The part of the oar the oarsman holds while rowing is called the handle. While rowing, the oars are supported by metal frames attached to the side of the boat called riggers. The parts of an oar are (labelled from outside the boat first): spoon, loom (or shaft), 2/3 of the way up is the sleeve (including a wearplate) and button (or collar), and at the very end the handle and grip. There are hundreds of different variations of oars, in terms of size and manufacturer specifications. "Macon" or "Cleaver" blade shapes of carbon-fibre are the most common in modern day rowing. Classic oars were made out of wood, but since the use of synthetic materials the weight of an oar has come down from over 7 kg to less than 2.5 kg. ==Blade shapes== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Oar (sport rowing)」の詳細全文を読む スポンサード リンク
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