Ever while walking to any location, say out loud, "Walk 1, engage!"?
Then as you walk, you increase your "walk speed" incrementally, saying out loud a higher number eveytime you get faster, until you reach maximum velocity, and you can then determine your maximum "walk speed" by remembering the last number you shouted out before you hit the floor. LoL
You may also be tempted to have the Engineer shout up from your lower deck, "she can't take much more of this Captain!", just don't do it in public.