What powered shipboard aircraft catapults before steam systems were introduced?
Short answerA hydraulic winch system powered the earlier catapults.
NotesBefore steam catapults, a hydraulic winch system supplied the launch force. The discussion looks for a Type H Mark VIII illustration to make the machinery clearer. Stored hydraulic force was converted into the launch stroke rather than relying on an elastic launcher. This identifies the pre-steam machinery found in descriptions of shipboard aviation.