After reading I'm still a little confused......

[Rosphere]

what is that?

It is a fly.  The fly is in the ointment.  You found him.  His name is Metastable.

and what does that have to do with this?

It ties in with with my earlier reply to you in one of your other threads:

I have been doing some research into PMMs for about a year now.  I have been reading watching other peoples creations and sometimes I wonder what they were thinking when they built it.  So far the best devience I have seen is the one Sterling D. Allan created.  So my question is what is problem with these devices?  What is the one thing that keeps them from becoming main stream?  I?m 18 years old I sometime in the future plan on building my own.  I think that one day this could work.

Metastability; I think that control is the problem with these metastable machines, like squeezing a wet soap bar.

We are attempting to tap finite amounts of an enormous natural vacuum energy.  It hides behind a thin, yet tough, vial.  There are many ways to do this, (or so I have heard,) but it must be done exactly right.

Today's internal combustion engines are stable: still able to run with a lean or rich fuel/air mixture and only stopping at the extremes to one other stable state: stopped.  Stable-running, easy to control, and forgiving.

Metastable machines are unforgiving, like a woman.  You need to treat them just right to get the performance that you desire.  But if you cross the line, you may experience a life changing event for the worse.  Sort of like a sticky window; hard to budge, yet easy to throw open--do this with the vacuum energy and it will destroy your machine, and maybe even you too.

Some devices, by the nature of their configurations, may offer better control of this metastable condition than others.  We, at the very least, seek to control devices which have a failsafe to a stopped condition if falling out of "tune," or if any one component fails.  Magnet motors appear to offer this quality: runaway acceleration will meet with increased bearing friction before shaft meltdown grinds it all to a stable stop.  We do not expect any crazy EMP type of events with this type of device.

Welcome to the forum, young man.   

I believe that metastability is the fly in the ointment of all energy devices attempting to tap the vacuum energy.  I am sorry that my image has caused you some confusion.  I will try to refrain from posting metaphoric images in the future. 

[Roen Hayden]

Well confusion can be a good thing you can learn from it.