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((use mdy dates|date=August 2021))
((Refimprove|date=August 2016))
[[Image:Croker Sculling Oars.jpg|thumb|150px|Two "cleaver" sculls. The blades which enter the water are at the top of the picture and the handles are at the bottom. Note how the oar shaft connects not to the midline of the blade (as is the case of macons) but rather higher pitch, that is toward an upper part of the spoon/blade when perpendicular to the waterline.]]

In [[rowing (sport)|rowing]], '''oars''' are used to propel the boat. Oars differ from [[paddles]] in that they use a fixed or sliding [[Fulcrum (mechanics)|fulcrum]], an [[oarlock]] or rowlock attached to the side of the boat, 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]].

When the rower uses one '''oar''' on one side, it is called ''sweep'' rowing that the single oar is called a "sweep" oar.<ref>((cite web |url=http://www.crokerusa.com/ |archiveurl=https://web.archive.org/web/20020827024649/http://www.crokerusa.com/ |archivedate=2002-08-27 |title=Croker USA))</ref> When the rower uses two oars at the same time, one on each side, it is called sculling, and the two oars are called a pair of "sculls". Typical sculls are around 284&nbsp;cm - 290&nbsp;cm in length &mdash; sweep oars are 370&nbsp;cm - 376&nbsp;cm.  A scull has a smaller blade area, as each rower wields a pair of them at any one time, operating each with one hand.  Since the 1980s many oars have been adjustable in length.

The shaft of the oar ends with a thin flat surface 40 to 50&nbsp;cm long and 25&nbsp;cm wide, variously called the blade or spoon.  Further along are the loom (or shaft), ((frac|2|3)) of the way up which is the sleeve (including a wearplate) and button (or collar), and at the very end the handle.  The handle may revert to wooden or, particularly in the case of sculls and some 21st century models of sweep-oar blades have rubber, cellular foam, suede or for example wood veneer grips over glass fiber.

The part of the oar the rower holds while rowing is the [[:wikt:Handle#Noun|handle]] which is longer for sweep blades as each is held using both hands, than for sculls which are held with one hand.

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. [[Oar|Classic oar]]s were made out of [[wood]]. Since the use of such synthetic materials, first mass-produced by the [[Concept 2|Dreissigacker brothers]] in 1975,<ref>((cite web |url=http://www.concept2.com/files/pdf/us/oars/Oar_Brochure.pdf |title=Oars and Sculls |page=2 |archiveurl=https://web.archive.org/web/20160407112153/http://www.concept2.com/files/pdf/us/oars/Oar_Brochure.pdf |archivedate=April 7, 2016 |publisher=Concept 2 |access-date=2016-03-28 |url-status=live))</ref> the weight of an oar has come down from over 7&nbsp;[[kg]] to less than 2.5&nbsp;kg and 1.275-1.8&nbsp;kg in the case of sculls.<ref>((cite web |url=https://www.crokeroars.com/sculling-oars |title=Sculling Oars |archiveurl=https://web.archive.org/web/20161109023134/http://www.crokeroars.com/#!sculling-shafts/cbaj |archivedate=November 9, 2016 |website=Croker Oars |access-date=2016-03-28 |url-status=live))</ref>  While rowing in the most common competitive boats, fine boats ([[racing shells]]), oars are since the early part of the 20th century supported by metal, fibreglass or carbon fibre frames attached to the side of the boat called [[outrigger|rigger]]s for extra leverage.

==Blade shapes==

===Cleaver===
The most common shape now seen is the "cleaver" (also called "hatchet"), which is used almost universally. Cleaver blades are [[asymmetrical]], with a somewhat rectangular shape resembling a [[meat cleaver]], hence the name. The shaft of a cleaver blade connects to the blade offset to the top corner 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 the amount and depth of the shaft that is submerged and contributing to [[Drag (physics)|drag]]. As the cleaver blade is asymmetrical it may only be used on one side of the boat or the other.  Technically, this is true of all oars, as the blade sits at a slight angle to the squared off surface on the sleeve.  Thus, when the oar is allowed to rest, it is not parallel to the water surface.  If used on the wrong side of the boat, the blade would dig into the water rather than skimming across its surface.

Cleaver blade designs were first developed by [[Dick Dreissigacker|Dick]] and [[Pete Dreissigacker]] in 1991.<ref>((cite web |url=http://www.rowinghistory.net/resources/equipment |title=The Development of Rowing Equipment |first=Bill |last=Miller |website=Friends of Rowing History |access-date=2016-08-03 |archive-url=https://web.archive.org/web/20160713122924/http://www.rowinghistory.net/Equipment.htm |archive-date=2016-07-13 |url-status=live))</ref> They are now manufactured by most major rowing oar suppliers, including [[Concept2]] and [[Croker Oars|Croker]].

[[Image:SquareMaconCleaver.jpg|thumb|left|350px|There have been three major types of blades used over the past century. Oars have generally become shorter, and blade area has been increased.]]

===Macon===
Some clubs use the older "macon" style blades (also called "spoons" or "tulips" or "shovels") for novice crews, usually to develop the basic technique of the rower without the extra complexity of a cleaver blade. A minority of coaches favor macons, but it has been generally accepted since their introduction in 1992 that cleavers give a speed advantage over macons under most conditions.((Citation needed|date=December 2008))

Macon blades are [[symmetrical]], with an [[ellipse|elliptical]] shape and a ridgeline running down the center of the blade face. The blade is squared off at the end. Despite the blade being symmetrical, modern asymmetrical collars or aesthetic issues regarding decorative paint on the blade face may dictate which side of the boat the blade can be rowed on.

Macon blades achieved prominence at the 1959 [[European Rowing Championships|European Championship]] in [[Mâcon]] when they were used by the [[West Germany|West German]] national team. West Germany won all the male [[Sweep (rowing)|sweep]] events that year, except the [[coxless four]].

===Square===
Before macons a longer, thinner shape was used, known as "square" or "standard" blades. Some rowers of traditional skiffs use them but macons or wider oars dominate in dinghy rowing. A few racing shell clubs/coaches keep some for training for technique in their learner boats.

At any given moment a propelling blade seen stationary, outboard of that point shifts water providing guaranteed drive (linear velocity), and inboard of it relative drag (radial velocity). Shorter, wider blades concentrate the former yet must be in a design not liable to snap. Thus the development from standard to macon to cleaver is a progression from long, thin blades to shorter, wider ones and more durable material. Each stage is a reduction in the solid-2D-profile, current and eddies that, at typical speeds, may work the wrong way and chiefly in a purely radial way in favour of pure lineal velocity.

==See also==
* [[List of rowing blades]]
* [[F Collar]], supplier of oars to every Olympic game from 1952 to 1984

==References==
((Reflist))

((DEFAULTSORT:Oar (Sport Rowing)))
[[Category:Rowing equipment]]

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