With respect, I think the many accounts of things heard from a mate or someone allegedly with a relative working on the ship need to be treated with a dash of caution. I don't doubt there have been plenty of niggles on a project of this vast scale, and there will doubtless be more as the trials proceed; but (for example) tracking data of the sea trials shows QE achieving over 26 kt for a period of at least 15 mins on a couple of occasions (bearing in mind these are early days to be doing high speed trials), and that is for a ship with a design speed of 25 kt.