Could Yamato join the fast battleships hunting Bismarck?
Short answerNo. Yamato commissioned too late and her roughly 27-knot speed fell below the 28-knot cutoff used here for the fast-battleship group.
NotesBismarck's sortie occurred in May 1941, while Yamato did not commission until December and would not finish working up until 1942. Her 27-knot speed also falls below the 28-knot cutoff used here for the fast-battleship group. Bismarck could make about 30 knots, so Yamato would be poorly suited to the pursuit even if she were available. Both the deployment calendar and the proposed force's speed requirement therefore rule out this matchup.