Hello pmillett22,
Indeed, you are right about these inaccuracies, and it has already been discussed elsewhere, together with other ones. But with regard to accuracy, a discussion of speed and RPM can also be found in closer details and probably more accurately in the Encyclopedia Titanica (http://www.encyclopedia-titanica.org/item/5661/), in a very interesting paper by Samuel Halpern
Regards,
Luc