TMann Posted November 5, 2007 Share Posted November 5, 2007 .....so I'm watching the Berkut video this weekend and I can't help but wonder at the response I got at the start of my build when I metioned I was planning on using the West epoxy system. It seems that West Epoxy is all that is used in the Berkut video. So, what was that all about? Is this an approved epoxy for the Berkut only? They have a gallon can of 205 hardener in the video and mention that as well. Richard, what say you on the subject? Quote T Mann - Loooong-EZ/20B Infinity R/G Chpts 18 Velocity/RG N951TM Mann's Airplane Factory We add rocket's to everything! 4, 5, 6, 7, 8. 9, 10, 14, 19, 20 Done Link to comment Share on other sites More sharing options...
Wayne Hicks Posted November 6, 2007 Share Posted November 6, 2007 West 105 resin and 209 hardener are approved for structural applications on the RAF and Cozy designs. Quote Wayne Hicks Cozy IV Plans #678 http://www.ez.org/pages/waynehicks Link to comment Share on other sites More sharing options...
TMann Posted November 6, 2007 Author Share Posted November 6, 2007 The Berkut site lists the following: West 105 Resin and 205 and 206 Hardner This is the manufacturer of this resin system. You can find it at most marine supply companies, as well as Aircraft Spruce and Wicks. Just wondering why they would use this sytem for a high performance bird like the Berkut vs. approval for a Long-EZ? Quote T Mann - Loooong-EZ/20B Infinity R/G Chpts 18 Velocity/RG N951TM Mann's Airplane Factory We add rocket's to everything! 4, 5, 6, 7, 8. 9, 10, 14, 19, 20 Done Link to comment Share on other sites More sharing options...
Marc Zeitlin Posted November 6, 2007 Share Posted November 6, 2007 Just wondering why they would use this sytem for a high performance bird like the Berkut vs. approval for a Long-EZ?As has been discussed previously, the reason for the 205/206 NOT being approved for VE/LE/COZY's had nothing to do with structural properties, and all to do with cure times and exotherming. Since the Berkut KIT comes with all major parts fabricated (spars, wings, etc), and the only thing that the builder does is ASSEMBLE parts with tapes, etc., the dangers of exotherming from large, deep, heavy layups is very much reduced. There's NO WAY you could lay up a spar cap using 105/205/206 without having an exotherm, but 2 BID tapes are no problem. Since you're building from scratch, not a kit, I'd stay away from the 205/206 for any of the large layups, and just use them for tapes/filling, if I were you (and anyone else not building from a kit). Quote Marc J. Zeitlin Burnside Aerospace marc_zeitlin@alum.mit.edu www.cozybuilders.org copyright © 2024 Link to comment Share on other sites More sharing options...
TMann Posted November 6, 2007 Author Share Posted November 6, 2007 Good info here Marc. I myself have some West on hand and plan to use it for my fill layer. The question came up in my mind while watching the Dave R. show (Berkut Video) and in those tapes they lay up spar caps, shear web & skins for both the canard and wing (when building from foam cores.) Myself, I'm using MGS 335 and have been quite happy with it. I was just surprise (based on previous feedback and research) to see them using it to such an extent in their video. I was really hoping Richard could shed some light on this as he is/was the 'inside man'. Quote T Mann - Loooong-EZ/20B Infinity R/G Chpts 18 Velocity/RG N951TM Mann's Airplane Factory We add rocket's to everything! 4, 5, 6, 7, 8. 9, 10, 14, 19, 20 Done Link to comment Share on other sites More sharing options...
magnum Posted November 6, 2007 Share Posted November 6, 2007 I'm using the West system and have had no problems with it. I do not do the large layups like Marc explained. I bought my main spar from Dennis and will do the same for the canard when I am ready for it. WIngs should be no problem. I like it because its easy to use and I can get it about 5 blocks from my house, always in stock and no shiiping hassles. Press on! Tom Quote "Time flys when your building" Link to comment Share on other sites More sharing options...
TMann Posted November 6, 2007 Author Share Posted November 6, 2007 yeah ...... I would really like to know what drove the decision to use West in the Berkut kits. Could it have sommething to do with the CF in the build? The spar caps for both the canard and the wing are CF as is the wing skin. It would be nice to know the 'how come' behind it. Quote T Mann - Loooong-EZ/20B Infinity R/G Chpts 18 Velocity/RG N951TM Mann's Airplane Factory We add rocket's to everything! 4, 5, 6, 7, 8. 9, 10, 14, 19, 20 Done Link to comment Share on other sites More sharing options...
mak790 Posted November 7, 2007 Share Posted November 7, 2007 TMann check this thread it's about West system VS. everything else http://www.homebuiltairplanes.com/forums/showthread.php?t=2971 Mak Quote Link to comment Share on other sites More sharing options...
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