How many losses to German torpedo boats could Britain avoid with the proposed 39 additional torpedo-boat destroyers?
Short answerNo fixed number is possible because the result depends on whether they reinforce Harwich, Dover, convoys, or the Grand Fleet, though every allocation would be useful.
NotesThe prompt proposes another 39 torpedo-boat destroyers, with initial uncertainty about the stated class names and counts. The practical answer is that extra hulls would be welcome without allowing a calculation of avoided losses. They could reinforce the Harwich Force, Dover Patrol, convoy protection, or the Grand Fleet screen. Each use affects a different set of engagements and risks. Thirty-nine ships remain significant even within a Royal Navy distributing destroyers by the hundred, so the answer depends on their assignments.