Reverse Canvas Difference - Gyakukanbasusa

…If the distance is greater than that, it is called “daylight” and if it is more than seven boat lengths, it is called “wide gap”. The overall length of the eight is 15-18m, and about 1.5m of the bow and stern are covered with waterproof cloth to protect against waves, so they are called canvases. Based on this, a close gap of 1-2m that touches the front top canvas is called “canvas gap”, and a gap that exceeds three-quarters of the boat length and touches the rear rudder canvas is called “reverse canvas gap”. In addition, there are races in the UK called bumping races, where boats start at the same time in a narrow river and change positions based on the number of times they touch (bump) the boat in front, and this is repeated for several days, with the winner given the title of “Head of the River”, or long-distance time races held mainly in winter, where the winner is also given the honor of “Head of the River”. …

*Some of the terminology explanations that mention "reverse canvas difference" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…それより離れると〈水があくdaylight〉といい，7艇身以上は〈大差〉である。エイトの全長は15～18mで，船首，船尾の上部それぞれ約1.5mは波よけの防水布が張ってあるのでキャンバスと呼ばれ，これを目安に，前部トップキャンバスにかかる1～2mのきわどい差を〈キャンバス差〉，4分の3艇身を超えて後部ラダーキャンバスにかかる差を〈逆キャンバス差〉という。なお，レースの方法としては，バンピングレースbumping raceと呼ばれる，狭い川でいっせいにスタートし，前のボートにタッチ(バンプ)した回数で順位を入れ替え，これを数日くりかえし，優勝者に〈川の先頭Head of the River〉の称号を与えるもの，あるいは主として冬季に行われる長距離のタイムレースで，同じく優勝者に〈川の先頭〉の栄誉を与えるものなどがイギリスで行われている。…

※「逆キャンバス差」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。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報