four-oared shell without coxswain

...There are no regulations on the material or size of the boats, but since 1982 the International Rowing Federation has set weight limits for different events, putting a stop to the expensive race to make the lightest boats possible. For example, the shell of an eight must weigh at least 93 kg, and the single scull at 14 kg.
[Sports]
The events in the Olympics and World Championships are (1) single sculls, (2) double sculls, (3) quadruple sculls, (4) four-oared shell without coxswain, (5) pair-oared shell without coxswain, and (6) eight-oared shell with coxswain, eights. Only the four-oared shell is a men's event, while the others are both men's and women's. The six men's and five women's events are open to all weight classes, and at the 1996 Atlanta Olympics, (1) the four-oared shell (men's) and (2) the double sculls (men's and women's) were added as lightweight events (average crew weight of men's crew under 70 kg and women's crew under 57 kg).

*Some of the terminology that refers to "four-oared shell without coxswain" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…艇の材質，大きさには規制はないが，1982年以降，国際漕艇連盟は種目による重量制限を設定，金のかかる軽量化競争に歯止めをかけ，例えばエイトのシェルは重量93kg以上，1人こぎのシングルスカルは14kg以上と定めた。
［競技種目］
　オリンピックと世界選手権での競技種目は，(1)シングルスカルsingle sculls，(2)ダブルスカルdouble sculls，(3)クォドルプルスカル(4人こぎスカル)quadruple sculls，(4)舵手なしフォアfour‐oared shell without coxswain，(5)舵手なしペアpair‐oared shell without coxswain，(6)エイトeight‐oared shell with coxswain,eightsであり，舵手なしフォアのみ男子種目，他はすべて男女双方の種目となっている。以上男子6，女子5種目が体重無差別で行われ，1996年アトランタ･オリンピックから軽量級(クルーの平均体重が男子70kg以下，女子57kg以下)として，(1)舵手なしフォア(男子)，(2)ダブルスカル(男子，女子)が加わった。…

※「four-oared shell without coxswain」について言及している用語解説の一部を掲載しています。

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