The calculation begins with the existing machinery zone, estimated at about 150 feet, and asks how much space a substantially more powerful plant would require. Increasing that region by roughly one third suggests about fifty additional feet, while a small allowance is also needed to rearrange the unusual forward turret sequence. Combining overlapping requirements produces an estimated hull extension near sixteen metres, or about fifty-three feet. The ships would remain shorter than Hood despite the change. Added structure and machinery weight might require modest armour reductions in selected areas, illustrated by trimming a fourteen-inch thickness to roughly thirteen and a half inches. The exercise makes clear that improving speed is not a simple engine swap: machinery volume, hull strength, turret geometry, armour, and displacement all interact.
Notable Point · 3:58:14-4:00:51
The hull extension needed for faster Nelsons
A closing estimate adds roughly sixteen metres to Nelson and Rodney for larger machinery spaces while slightly reducing armour to control displacement.