I think what Easo meant to say was that the Sentinel was the first tank to utilise a single casting for the entire hull.
The 'AC4' was, of course, a 'drawing board' tank: it was not actually built. The images that purport to show the AC4 are actually an E series (I think E-3?) test bed hull with a turret casting mounting a 17pdr: it was a concept mock-up only. Note, in the image, the 'stub' of the hull MG mount in the centre front of the hull: a feature of the AC1 deleted in the AC3, and would have been deleted in the AC4 as well, if it had reached prototype stage.
Not sure what the projected turret ring diameter was: will have to check.
Mike C
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23-11-11, 19:42
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