http://groups.yahoo.com/group/CompositeRockets/ Composites for Rockets Tue, 24 Nov 2009 15:41:20 GMT Steve Peterson http://groups.yahoo.com/group/CompositeRockets/message/9419 http://groups.yahoo.com/group/CompositeRockets/message/9419 ... Nope. --Steve Tue, 24 Nov 2009 05:32:26 GMT watheyak http://groups.yahoo.com/group/CompositeRockets/message/9418 http://groups.yahoo.com/group/CompositeRockets/message/9418 By the way, Steve, are you an AHPRA member??? Scott Tue, 24 Nov 2009 05:09:29 GMT jeffshort2004 http://groups.yahoo.com/group/CompositeRockets/message/9417 http://groups.yahoo.com/group/CompositeRockets/message/9417 Ahhh... well I haven't done any molds. Only fiberglassing tubes/fins. Jeff Mon, 23 Nov 2009 23:51:17 GMT Steve Peterson http://groups.yahoo.com/group/CompositeRockets/message/9416 http://groups.yahoo.com/group/CompositeRockets/message/9416 ... Ugh. Been there myself. Major bummer. Hope it won't take much to put them back together. Thanks for the info on machining the foam.... --Steve Mon, 23 Nov 2009 23:45:00 GMT black_magic_rocketry http://groups.yahoo.com/group/CompositeRockets/message/9415 http://groups.yahoo.com/group/CompositeRockets/message/9415 Kelly, Don't forget to check out the files and links sections for the group, along with searching previous posts, as there is a lot of great info already Mon, 23 Nov 2009 23:18:51 GMT Lakestake Rocketry http://groups.yahoo.com/group/CompositeRockets/message/9414 http://groups.yahoo.com/group/CompositeRockets/message/9414 Hi Steve, The short answer is that I was using the wrong tool so I took light cuts. I started out by cutting the foam into cubes and gluing them together with Mon, 23 Nov 2009 23:00:03 GMT Steve Peterson http://groups.yahoo.com/group/CompositeRockets/message/9413 http://groups.yahoo.com/group/CompositeRockets/message/9413 ... I've seen the florist's stuff so I know the material you're talking about--I just figured it would flex too much to work very well in a lathe, or break Mon, 23 Nov 2009 22:37:11 GMT watheyak http://groups.yahoo.com/group/CompositeRockets/message/9412 http://groups.yahoo.com/group/CompositeRockets/message/9412 Thanks, Matt. I'll post pictures somewhere. Either here or the Rocketry Planet forums. And I'll be back here a bunch with a bunch of questions I'm sure. Not my Mon, 23 Nov 2009 22:21:38 GMT Lakestake Rocketry http://groups.yahoo.com/group/CompositeRockets/message/9411 http://groups.yahoo.com/group/CompositeRockets/message/9411 Hey Scott, that sounds like a really neat project! Remember to forward us a link to your site when you're done. Matt On Monday, November 23, 2009, watheyak Mon, 23 Nov 2009 22:18:18 GMT Lakestake Rocketry http://groups.yahoo.com/group/CompositeRockets/message/9410 http://groups.yahoo.com/group/CompositeRockets/message/9410 Hi Steve, The mandrels were 1.75" diameter and 28" long. The florists foam is like stiff crispy styrofoam. I did back the part as I was cutting. Matt On Mon, 23 Nov 2009 21:44:48 GMT kel mit http://groups.yahoo.com/group/CompositeRockets/message/9409 http://groups.yahoo.com/group/CompositeRockets/message/9409 yeah I have seen it and bought that video tape about 5 yrs ago. Now they have DVD and didnt have in youtube back then. Like for examble, my Nephew wanted to Mon, 23 Nov 2009 21:17:12 GMT Steve Peterson http://groups.yahoo.com/group/CompositeRockets/message/9408 http://groups.yahoo.com/group/CompositeRockets/message/9408 Well, as it happens, I've done something similar and for similar reasons. But my method was different. I wanted no aerodynamically-detectable seam between the Mon, 23 Nov 2009 20:56:41 GMT watheyak http://groups.yahoo.com/group/CompositeRockets/message/9407 http://groups.yahoo.com/group/CompositeRockets/message/9407 Why lost foam method? Well, it's complicated. Or maybe just weird. This is for a 38mm minimum diameter altitude attempt rocket. For this particular rocket I Mon, 23 Nov 2009 20:45:18 GMT Steve Peterson http://groups.yahoo.com/group/CompositeRockets/message/9406 http://groups.yahoo.com/group/CompositeRockets/message/9406 I was thinking that the aspect ratio of 1.5" by 13" would make for a pretty skinny (and therefore flexible) part. What diameter/length were yours? Maybe foam Mon, 23 Nov 2009 20:33:47 GMT Lakestake Rocketry http://groups.yahoo.com/group/CompositeRockets/message/9405 http://groups.yahoo.com/group/CompositeRockets/message/9405 Steve you're right of course, that's a better approach in general. I just did a set of nice lost foam cores for a couple of large hybrid motors using green