killerb1971 Posted February 25, 2008 Share Posted February 25, 2008 I am just about to wrap up chapter 4, but by reading the plans and looking at the drawings, it leaves me with a few questions. First, does the temporary firewall need the blind screws or hard points installed as well? Second, the plans say to make the hardpoints 1"x1.25", when the drawing has a 1" square hole. Which is it? And if it is 1"x1.25", which part of the square on the drawing is my point of reference for the rectangle? Does the longer part go vertically or horizontally, and from which end of the square? Also do the hardpoints need any treatment before install? Do they get 5min epoxied in or floxed? Sorry about all the questions, but the plans don't seem to be clear on this, and I am VERY particular on how this plane is put together. Thanks in advance for all your help and advice. Quote Rob Wiehl COZY MKIV #1521 Link to comment Share on other sites More sharing options...
rickh Posted February 25, 2008 Share Posted February 25, 2008 1" square seems about the minimum, some builders go a bit larger to ensure the engine mounts will hit the hardpoints. Flox them in. Alodine won't hurt, the added cost is trivial. See: http://www.cozybuilders.org/mail_list/cozy-faq.html Rick Quote Rick Hall; MK-IV plans #1477; cozy.zggtr.org Build status: 1-7, bits of 8-9, 10, 14 done! Working on engine/prop/avionics. Link to comment Share on other sites More sharing options...
macleodm3 Posted February 25, 2008 Share Posted February 25, 2008 First, does the temporary firewall need the blind screws or hard points installed as well?No, in fact the temporary firewall can be a plain old square piece of plywood. Also do the hardpoints need any treatment before install?My conclusion after researching this question last year was that all aluminum parts should be cleaned and protected, such as alodining (in archives and mail list). Do they get 5min epoxied in or floxed?Mine were a tight fit on the edges, but I used flox. ALSO realize that the aluminum is thicker than the permanent firewall 6mm plywood. A had a little flox fillet there to make glassing easier. And if it is 1"x1.25", which part of the square on the drawing is my point of reference for the rectangle?You want the center in the correct place. Use the center of both dimension from the drawing. Quote Andrew Anunson I work underground and I play in the sky... no problem Link to comment Share on other sites More sharing options...
killerb1971 Posted February 26, 2008 Author Share Posted February 26, 2008 Great. Thanks for the advice guys. I can see the light at the end of the ch4 tunnel. Quote Rob Wiehl COZY MKIV #1521 Link to comment Share on other sites More sharing options...
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