John Roberts's volume is recommended for its large plans of Cossack, HMCS Haida, and other Tribal-class ships, along with its technical detail. A 1936 modification programme added powered 4.7-inch ammunition hoists and shifted the after mountings. The hoists added 22.8 tons, while the design weight of each 4.7-inch mounting increased by 2.92 tons, raising estimated standard displacement to 1,891 tons. The extra weight carried a possible half-knot speed penalty, although Cossack closely matched the revised design estimate. Moving the mountings reduced blast interference with the pom-poms, after steering position, and signalling light, while shifting the mast improved wireless range and eased congestion around the torpedo tubes. Designers still had to protect ammunition movement along the upper deck in poor weather, so a hoist fed a screened working area near the after mounting. Together, the changes show the trade-offs among armament layout, communications, blast effects, seakeeping, weight, and speed.
Chapter · 12:41-15:52
Cossack plans reveal Tribal-class design trade-offs
John Roberts's Cossack study pairs detailed plans with an explanation of how the Tribal class balanced ammunition supply, blast effects, displacement, and wireless arrangements.