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| Keywords: Ship stabilizing gyroscopes USS Henderson 1917.jpg gyroscopes being installed in the USS Henderson as a roll stabilizing system during its construction April 1917 at the Philadelphia Navy Yard in World War 1 The Henderson a transport of 80 ton displacement was the first large ship to be gyroscopically stabilized to prevent the ship from rolling from side to side with ocean swells The gyros built by Sperry Rand consist of two 25 ton 9 ft diameter flywheels which during operation are spun at 1100 RPM in opposite directions by 75 HP AC electric motors Each gyro case is mounted on a vertical bearing which can be turned by a 75 HP servo motor When a small sensor gyro on the ship's bridge sensed the ship roll it ordered the servo motor to rotate the gyros about the vertical axis in a direction so the gyro's precession would oppose the ship's roll During trials they were able to keep the ship roll down to 3 degrees in the roughest seas This technology was replaced by roll stabilizer fins and is not used today 1917-04 Retrieved November 7 2015 from http //www ibiblio org/hyperwar/OnlineLibrary/photos/images/h53000/h53508 jpg Online Library of Historical Images US Navy Historical Center Dept of the Navy Washington D C Also published in http //www americanradiohistory com/Archive-Electrical-Experimenter/EE-1919-03 pdf Electrical Experimenter magazine The Experimenter Publishing Co Inc New York Vol 6 No 11 March 1919 p 775 fig 4 author Photo taken by a member of the US Navy during performance of his duties other versions PD-USGov-Military-Navy Gyroscopes Ship stabilizers Uploaded with UploadWizard | ||||
