" DAMAGE CONTROL - ELEMENTS OF STABILITY " 1943 U.S. NAVY TECHNICAL TRAINING FILM XD68945

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This 1943 film, believed to be entitled "Control Elements of Stability" offers a visual explanation of how weight is distributed in a ship and the different elements that governs its stability such as: the righting arm, the center of gravity and the center of buoyancy. The film demonstrates, through diagrams of ships and demonstrations with a model ship, how shifting weight distributions can increase or decrease stability in the ship. In the film, diagrams that are used to determine the stability like the statical stability curve, are explained through visual explanations which show how stability elements are calculated to create the curve. The film was produced by the Navy Department for the United States of America.

00:29 Model of unidentified US war ship floating in tank water 2:17 Scale attached to sheet of metal shaped like a boat in a tank of water visually demonstrating a balanced force of gravity 4:56 Illustrated diagram of a ship with the point of gravity identified by a downward arrow 5:18 Two weights attached to a bar demonstrating a balanced center of gravity 6:02 Diagram of the ship tilting to the left and right due to a shifting weight in the ship which is disrupting the center of gravity 8:45 The ship in waves demonstrating the constant shifting of the center of buoyancy 9:22 Illustration of the center of gravity and center of buoyancy working in opposition to each other as the ship is rotates to the left, right and at rest 12:44 A rocker with two attached arrows indicating the center of gravity, also signified by the letter ‘G’, and the resistant force 14:21 Rocker pulled to one side by a scale attached to it with a ruler beneath the rocker measuring the distance between the lines of force 15:38 Diagram of two differently sized ships side by side tilting to the right 16:32 Below the two ships, illustrated calculations for each ship calculating the force required to return it to an upright position 17:06 Diagram of a ship inclined to the right with an illustration of the angle of the righting arm 17:57 The ship moving up and down and rolling side to side in sea waves illustrating the range of stability of the ship 19:47 The righting tendency being demonstrated on the rocker with a measuring device attached to it pulling it to one side and two arrows signifying the lines of force 21:19 Diagram of three different types of ship on the water 21:31 A booklet of the Inclining Experiment Data for the fleet tug USS Massasoit (YT-3) containing the Statical Stability Curves 21:41 Table in the booklet showing the Statical Stability Curves for the USS Massasoit 23:37 Small scale boat model in a water tank demonstrating how the statical stability curve changes depending on its load 25:44 The model boat tilted by two hands to an angle of 135 degrees in the water tank 29:40 A boat model with a weighted load placed high in the boat causing it to tilt more dramatically as a weight shifts side to side on the top of the boat 30:00 A hand tilting the boat model to one side and releasing to determine the period of roll 30:16 The same experiment being demonstrated but with a weight placed low in the boat causing the boat’s tilt to lessen 30:40 A weight placed on top of the boat and the same experiment being conducted and the boat tilting more dramatically 31:23 The boat model with the first submerged level full of water demonstrating how the boat is slow to right due to the opposing constant shifting of the water 32:53 The boat model with the first level flooded with water being rocked side to side to demonstrate how the angle of heel is smaller with the unstable center of gravity 33:07 The model boat with two levels flooded demonstrating how it is unable to float at an upright position 33:49 Diagram overlaid on the boat model demonstrating how the center of gravity and the center of buoyancy aligned 34:52 the boat model with all levels flooded floating unstably in the water then capsizing.

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This film is part of the Periscope Film LLC archive, one of the largest historic military, transportation, and aviation stock footage collections in the USA. Entirely film backed, this material is available for licensing in 24p HD, 2k and 4k. For more information visit http://www.PeriscopeFilm.com