Which destroyer finding would have most alarmed the Royal Navy if published when the Tribal class was being built?
Short answerThat the Tribals could not deal well with high-angle air attack and needed stronger anti-aircraft arrangements, including more pom-poms and an adapted 4.7-inch mounting.
NotesThe Tribal class's high-angle weakness would have caused the most trouble if published while the ships were new. The Royal Navy presented itself as well prepared for air attack, so evidence that the destroyers could not meet steep attacks would produce a serious institutional shock. The fleet also needed more pom-poms. The 4.7-inch mounting could have been adapted for higher-angle work, although the change would increase weight.