Before we get started want to make it clear that I have never nor ever will get along well with any form of computer, just muddle my way through basically ( Think along the lines of "A thousand monkeys at a thousand typewriters"). Well then, on to my project ... I have an Estes Scion that I built stock with the exception of a baffle and nosecone ebay. I suspect my version of Open Rocket/crappy ancient Dell 5500/self are somewhat incompatible because I cannot for the life of me get anything to sim correctly. I've un/re-installed Java and Open Rocket multiple times with no joy (never managed to get 3D to work but that's not really all that important at this point). Attached is my O.R. file with a list of single use motors that I currently have and single use H and I that should be available for my attempt. Stability is unobtainable despite my best efforts. Weight and CG are not even close and I cannot get any cooperation out of this cursed machine. Any help at all would be much appreciated. Thanks in advance.....Ok, here's a prime example. I can't upload the file because size on disc is 432 kb. I've attempted to open and compress it but nothing seems to be compatible. Ugggh...