Fourth tentative scheme in the path-finding process during the early stages of the BB-55 design progress. After the relative conservative ‘Scheme A’ and ‘A1’ the next ‘B’ and ‘C’ designs applied full size armament (compared to pre-Treaty superdreadnoughts) while offering high speed and relatively good protection against 14″ guns. Essentially this was a modern, fast (~30 knot) version of the older dreadnoughts, with alternating machinery arrangement and geared turbines. Note the 180.000 SHP powerplant which was four times as much as the older cousins had and equaled the turbo electric plant intended for the LEXINGTON class CCs.
For Scheme C armament was upped to the 16″/45 Mark 6 (2240 lb shell) but protection was still based on the older 14″/50 Mark 7/11 guns performance (1400 lb shell).
Note however that both ‘B’ and ‘C’ had an up-armored version (‘B1’ and ‘C1’ resp.) versus the more modern 14″/50 Mark B and it’s 1500 lb shell with an IZ of 19-30 kyard that translated to 15″ (380 mm) belts. Interestingly enough the deck could stay the same 5.25″ (133 mm) as the 14″/50 had a flat trajectory already and the marginally heavier shell had a comparatively lower muzzle speed that in turn negated the weight advantage. This was later a huge factor in favor of the 16″ gun for the actual ships, as the bigger gun had a much heavier shell and therefore a lot better penetration at the outer edge while the inner edge was the same or better. Plus the bigger gun dealt much bigger damage even with a single hit.