bilge-keel

"If her bilge-keel doesn't cooper him, her port propeller will!"

Blow The Man Down A Romance Of The Coast - 1916 Holman Day 1900

Herr von Schalckenberg conducted his hostess forward and into the space between the starboard bilge-keel and the bottom of the ship, where there was just sufficient room for a tall man to stand upright close to the inner face of the bilge-keel.

With Airship and Submarine A Tale of Adventure Harry Collingwood 1886

There were two modes of ingress to the interior of the ship, one, as has already been mentioned, from the deck, by way of the pilot-house, and the other by way of a trap-door in the bottom of the ship, behind the starboard bilge-keel.

With Airship and Submarine A Tale of Adventure Harry Collingwood 1886

They were now in the tunnel-like passage formed by the starboard bilge-keel and the ship's hull, which curved out over them vast and ponderous as an overhanging cliff.

With Airship and Submarine A Tale of Adventure Harry Collingwood 1886

As the professor said this he released the fastenings of the door, and it fell down, forming a sort of inclined plane, over which they passed, to find themselves once more on the solid earth, under the ship's bottom, with the starboard bilge-keel rising like a wall of silver before them.

The Log of the Flying Fish A Story of Aerial and Submarine Peril and Adventure Harry Collingwood 1886

At length they found themselves in the clear open space occupied by the _Flying Fish_; and in another quarter of an hour the party passed into the black tunnel formed by the bilge-keel and the side of the ship, and began to feel with their feet for the open trap-door.

The Log of the Flying Fish A Story of Aerial and Submarine Peril and Adventure Harry Collingwood 1886