Bretagne was a 130-gun improved Océan-class ship built around screw propulsion and commissioned as an exceptionally powerful warship. Reported top speeds range from roughly 11 to 13.5 knots, with 12.6 knots presented as the more plausible figure. The highest result may have come while the ship was lightly loaded and carried neither her normal guns nor stores. Machinery condition, displacement, and trial conditions matter as much as the headline speed.
Notable Point · 1:01:19-1:02:55
Bretagne’s disputed speed depended on load and machinery condition
Claims from 11 to 13.5 knots show why early steam-warship speed figures need the loading and trial conditions attached.