Waist Cat? There was only one steam catapult aboard HMAS Melbourne. During the early A4G era it was upgraded with some bits from scrapped BONAVENTURE to have a cat stroke of 100 feet with a strop catcher so we see the cat crew running up to the catcher for strop retrieval. I'll post a SLOMO video. Generally the lateral G was 6, sometimes a bit more at more than usual heavier weights etc. The WAR SHOT at 9G (A-4 stressed to this level) was never experienced by a HUman
AFAIK but the lead sled CHLOE would have been tested alongside wharf in Sydney Harbour.
A4G Skyhawk & S2E Tracker Slow Motion Deck Ops Tests aboard HMAS Melbourne in Early 1970s
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SLOW MOTION Catapults A4Gs 886 & 889
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A4G Arrest HMAS Melbourne & Hook Runner Slow Motion
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NAVY CATAPULT TEST - HMAS MELBOURNE - SOUND [lead sled CHLOE]