<<In a message dated 11/22/2004 9:53:27 AM Central Standard Time, [EMAIL PROTECTED] writes:
I still think that this is your real problem - "If you have to slide your finger under the mylar to get it off, you may have a problem". Not the vacuum, not the foam. I told you at the very beginning of this quest that you are probably damaging the wing when you remove the mylars. You are sliding your fingers under the mylar with your nails towards the wing and you run your nails on the surface of the wing, correct? This is not a problem with heavy skin, but is a no-no with a very light wing skin. Regards, Oleg.>> Yup, that's apparently a significant part of the problem. I'm not yet completely convinced it's the only problem. But based on your feedback and comments from others, that's been a point to watch very carefully. The light layup is definitely a challenge, especially with 15psi foam. In checking my previous notes from ~ 2 years back, the skin layup was heavier and the foam was Foamular 250. Even with the occasional 'finger assist' on the release, I hadn't seen this problem. So the school of hard knocks has finally taught me what you guys already knew. That's where RCSE has been very valuable. This particular configuration is somewhat rare so it may not be generally useful for most applications. But someday it will come in handy. Your comments (and patience) are appreciated. Right now, I'm not having any problems with Dow 25psi with any layup or at any pressure. However, even with a very good release and very careful handling, I still find an occasional defect with Foamular 150 and higher vacuum with a light layup. Since the bulk density is indistinguishable, there's just no reason for me to use the 150 for wings right now. Thanks again for everyone's input. Just cut three wing sets using the AG12-13-14 sequence. The cutting went well. I expect the bagging will too. - Dave R RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
