The original ships used two shafts, 45,000 shaft horsepower, eight boilers, and two geared turbines. The alternative has twelve three-drum boilers, three geared turbines, and three shafts while keeping one funnel. Induced draught and the third shaft save weight against the Royal Navy's usual four-shaft preference. This machinery sketch belongs to a hypothetical new class and carries the compromises expected from a game model. It explains why 28 knots becomes plausible once Britain is ordering several ships.
Notable Point · 25:54-28:04
The machinery route to 28 knots
Reduced armour and a rearranged machinery plant are presented as the technical route from Nelson and Rodney’s 45,000 shp to a faster design.