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This was quite a bit more recently than SKR - it was associated with LPH(R), so would presumably have been with one eye on the SABR requirement.I think those comparisons were done during the SKR work.
Of course it's quite odd because the Chinook was nearly acquired under ASR.358 for the ASW role in the mid-60s so presumably back then some naval bod must have been tasked with working out exactly how much hangar space was needed. So it can't have been a secret, probably lost in institutional memory fade...