Oar (sport rowing)

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Two hatchet sculls. The "blades" are at the top of the picture and the handles are at the bottom of the picture. Note how the shaft connects not to the midline of the blade (as would be the case of macons) but rather to a corner of the blade.

In sport rowing, oars are used to propel the boat. Sculling oars are around 284cm - 290cm in length and rowing oars 370cm - 376cm long. The shaft of the oar ends with one flat end about 50 cm long and 25 cm wide, called the blade. 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 first): blade, loom, 2/3rds of the way up is the collar (consisting of wearplate and sleeve) and button, and at the very end the handle and grip.

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. A sculling oar is shorter and has a smaller blade area than the equivalent sweep oar.

There are hundreds of different variations of oars, but these are the most common types. Classic oars were made out of wood, but modern oars are made from synthetic material, the most common being carbon fiber. Since the use of synthetic materials, the weight of an oar has come down from over 7 kg, to less than 2.5 kg. The most common makes are Concept2s and Crokers.

[edit] Blade shapes

The blade shapes are commonly "macons," "spoons," or "tulips" which are used for novice boats, and "cleavers" or "hatchets" which are used for racing boats. A macon oar has an elliptical shape and has a ridgeline running down the center of the blade face, around which the blade face is symmetrical. The blade is squared off at the end. Due to the blade face symmetry, macon blades are ambidextrous and can be rowed either on the port or the starboard side of the boat, although in most cases, aesthetic issues concerning the decorative paint on the blade faces may dictate an oar as belonging to one side of the boat or the other.

A hatchet blade's face is somewhat rectangular and looks like a hatchet, hence the name. The shaft of a hatchet blade connects to the hatchet offset to the top edge of the blade. The shape of the face and the offset connection is designed to maximize the surface area of the blade in contact with the water during the rowing stroke, while also minimizing excess material that would not contribute to driving the boat through the water. A hatchet blade is not ambidextrous.