tag:blogger.com,1999:blog-1098088316925899244.post7635675578616617590..comments2023-06-18T06:17:03.626-07:00Comments on Greg Smith's quest to spend even more money on rocket science...: Plaster City - March, too-zeero-won-thrie launch reportG Frickin' Munehhttp://www.blogger.com/profile/08134408510704933021noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-1098088316925899244.post-11509442390472901152013-03-26T20:57:12.482-07:002013-03-26T20:57:12.482-07:00Thanks, David. So below what threshold does the 1...Thanks, David. So below what threshold does the 1g per 1000N•s rule not apply? Also, I elected not to use a nozzle cap to avoid over-pressure. Might that have slowed my ignition?G Frickin' Munehhttps://www.blogger.com/profile/08134408510704933021noreply@blogger.comtag:blogger.com,1999:blog-1098088316925899244.post-22384855786321238012013-03-24T19:18:54.848-07:002013-03-24T19:18:54.848-07:00The ignition delay was probably caused by two thin...The ignition delay was probably caused by two things: (a) the short motor (a lot of the stuff gets blown out of it), and (b) using too much thermite -- overloading the grain with energy at ignition actually decreases the amount of thermal energy stored below the surface (I know, right?) leading to extinguishment when the flux is removed. Also, if the core is shiny, it makes the ignition delay ridiculously long. Try backing off on the thermite next time (I light Ks with 1-1.5g) and sanding the cores, and I bet your results will improve!<br /><br />--davidDavid Reesehttp://david.tdkpropulsion.comnoreply@blogger.com