Naval Gunnery and Early (Mechanical) Computers Randy H. Katz CS Division, EECS Dept. University of California, Berkeley [email protected] Spring 2010The Gunnery Problem • Cancel ship’s motion • Range to target • Range keeping • Actual shootingThe Gunnery Problem • Continuous aiming only made possible by gyroscopes Roll Pitch YawLonger Ranges and Larger Guns • Torpedo Threat (Russo-Japanese War): engage at > torpedo range – 800-1500 yds, to 3500 yds at reduced speed – Improved to 10000 yds between 1900-1914 • Plunging fire: armor below/above the waterline or topside – Heavier guns, flatter trajectories, longer danger space – 2x shell weight, 4x distructiveness“Danger Space” Danger SpaceRange Finding Known Height angle Calculated Distance Vertical Range Finding Horizontal Range Finding Known Distance Typ 9-15’ angle Calculated Distance What happens at night?Range KeepingRange KeepingRange KeepingDryer Plotting TableFor More Information • http://en.wikipedia.org/wiki/Frederic_Charles_Dreyer •
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