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Rereading Hobbs, the BS4 on Victorious may have been able to use higher pressure, that might be woth something like 5 kts. Unclear whether the catapults were overhauled, so we might also compare different versions.


What is definitely odd are the two different length bs4 on Hermes giving the same end speed. The F-4 options show two Hermes cats, and the longer one has more power - something like 6-7 kts judging from the added length and the longer CAP.

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 But at that point the longer catapult was just a plan. Did it really get installed in the late 60s refit?


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