Repulse averaged more than 32 knots on her 1916 trials, while reconstructed Renown approached 30 knots in 1939. Those figures show what a well-prepared ship and crew could achieve when machinery and conditions aligned. A warship's operational rating still had to be met when boilers were tired, weather was poor, or maintenance was less than ideal. Designers therefore built margin beneath a spectacular trial result rather than treating the best run as everyday performance. The distinction helps readers interpret claimed top speeds without confusing them with reliable fleet speed.
Notable Point · 1:26:26-1:27:43
Trial speed is not guaranteed warship speed
Renown and Repulse could exceed nominal speeds on good trials, but designers had to guarantee useful performance when machinery and conditions were imperfect.