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trunnion
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The powerful engines of mid-20th-century catcher boats allowed these vessels to overtake even the fastest whales.
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trunnion

mounting lug
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The powerful engines of mid-20th-century catcher boats allowed these vessels to overtake even the fastest whales.
The powerful engines of mid-20th-century catcher boats allowed these vessels to overtake even the fastest whales.

A trunnion is a pin or pivot that allows something to rotate or tilt. It is commonly seen as one of two opposite gudgeons on which a cannon swivels. The term "lug" can refer to a bolt that ends in a flat extension or hook instead of a head, or a bolt used for fastening a lug. A "standing lug" is a type of lugsail where the yard does not dip when tacking.123

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3 Britannica Sources
  1. trunnion
  2. lug bolt
  3. standing lug

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