mdnanwelch7(at)hotmail.co
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 Posted: Fri Dec 14, 2007 2:37 pm Post subject: Shrinking Poly Fiber |
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John H.
Yes, you are correct. The Poly Fiber Manual says a 350 degree iron can be left in one spot for a long time. It is NOT the time that does the shrinking, it is the temperature. 350 degrees will shrink the fiber to it's maximum, and even if you leave the iron in one place for quite awhile, nothing else will happen.
A long time ago (6+ years), when I was much further along building this MkIII than I am now, I had covered the fuselage. I was never really sure if it was as tight as I could get it. But, even then I didn't have the most accurate temperature calibrating method. It is entirely possible I was only using 275 degrees. To be honest, I don't really know.
That's why I say I feel more assured of checking the iron every minute or two with the IR Thermometer. I like being able to look at a spot on the surface of the iron and know it is "349 degrees", or whatever it is. Of course, with your experience level, you may not feel the need for such accuracy, but I don't have a fraction of your covering experience.
Like the good advice I received from everyone in regards to cutting and drilling Lexan, I am tired of doing things twice!! I like latching onto "fail safe" methods that keep me from screwing things up. That way, when my plane is finished, it can look like I knew what I was doing, instead of the truth...which is asking for a lot of advice and pointers.
Undoubtedly, my Kolb MkIII will be a better finished product due to the help offered by the members here in this forum.
Mike Welch MkIII in SW Utah
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