The opening of the prompt is missing, leaving the class under discussion unidentified. The design calculation is still useful: a 35,000-ton treaty limit provides about 1,500 additional standard tons while the Royal Navy's preferred battery remains nine guns. That margin could fund a third shaft and the engines and boilers needed to drive it. In this estimate, the change raises speed from roughly 26 knots on two shafts to about 28-30 knots, illustrating how treaty displacement can be exchanged for machinery.
Notable Point · 33:20-34:54
Trading treaty displacement for a third shaft
A fragmentary capital-ship question yields a clear design trade-off: 1,500 extra standard tons could fund a third shaft and push the unnamed design toward 28-30 knots.