Have not entered into building propulsion devices but believe I have isolated an inertia effect. And then both mathematically and with simple tests. On that occasion I came up with possible designs based on that. However, it has taken quite some time to get to this point. Don't know in what position others are concerning their designs? Know also that mathematical conclusions are not always the most popular form and which can as well take certain amount of time to examine or go through. Still my thoughts have been, that if the key principle behind inertia propulsion is more clearly understood it would or could at the same time lead to improvements or further progress on this area. At least that has been the view concerning this. Admit that it has not been the easiest part of the process to put this in front of others. Know however, that while going through this, that it has required a lot of patience and great terms of examination. Experimental things will give us the final answers but where an understanding is still not a bad thing even though it is gained on other terms. Either way, it requires a lot of time for certain things to be reached. Don't get me wrong because there is still quite a journey towards the 'final' goal in this. Still I think there are certain answers lying there already. Not necessarily always easy to see though. But as I say, nothing comes without an effort. Know that probably most of us just want to see devices up and running. And then devices that will give significant as well as constant thrust. The question is, what kind of method or terms are we willing to use to get to this point? Because, as I have said earlier, noting comes without an effort. About this it has been known for quite some time that there is an inertia propulsion effect 'hidden' there and where several devices has been built in that connection or based on that. And then by several individuals. We are speaking about decades back in time in that regards. Am writing this since I am not quite sure how to proceed myself when comes to this? Unfortunately I have not a running device to show or express. Though that would be the thing which I believe that most would want to see here. Sorry to disappoint you. Still I have my possible explanations and also possible devices based on that as I have already expressed. Maybe we shall see where this will lead to? Not always quite sure how to continue with this either? But where I really want to see these things proceed. Really want to see further conclusions in this regards or progress on this area. About all this I wasn't even sure what to write or express here? But where it finally ended on these terms. Just more meant as some kind of an opening but still not publishing anything here at this point though.