The Royal Navy flew an aircraft from the moving HMS Hibernia in May 1912, following an anchored takeoff that January. The United States tested a catapult launch in August 1912. An American catapult launch from a ship underway followed in 1915. These trials extended shipboard flying beyond demonstrations from stationary platforms.
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Hibernia and early catapult launch trials
British moving-ship takeoffs and American catapult trials tested ways to launch aircraft while ships were underway.