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![]() J.Kahn wrote: wrote: Bob Kuykendall wrote: J.Kahn wrote: The stuff is rolled into coils for shipment. Scroll down and check out the flat version bent by hand into a half circle. I've seen a picture of graphlite (TM) rod bent into a loop with a radius of about an inch or so. Now, imagine that you want a 2" diameter ring, like a key ring. Would you bend the rod into a circle and glue the ends together? I think not! Yup, that's the way I get it, spools of 1000 to 1500 feet. As you probably noticed, when you take it off the spool, it straightens out. I want to shape it so that it is curved without any applied stress. I don't think it's necessary to eliminate all preload. Nor do I. But if I want a curved structure made from the rod to hold its shape without a lot of built-in stress it is necessay to eliminate MOST of the pre-load. ... I would extend a graphlite top rib cap as far forward as it can be comfortably bent by hand and use a wood nose block for the very front for the nose radius. I wouldn't even consider doing that. If I'm going to use materials in addition to graphlite rod, I'll use foam, monofilament tapes, fiberglass, or some such. I love working with wood. I just don't see that as a efficatious use, if I'm already using composites. As noted before, there are a myriad of perfectly servicable alternatives, all of which are outside of the scope of the original question. There is no problem at all finding alternatives and how to use them. Perhaps more to the point, I just suggested a rib as an example. Being able to bend graphlite rod like one steam bends wood opens up a lot of design possibilites. Imagine, instead of reinforcing other materials with the rod, making a wing, or wing and fuselage built like a birdcage and then covered with Dacron. Not the cheapest and maybe not the lightest or strongest and certainly not the most practical way to go. But an interesting concept. How about a dirigible made the same way? (Here one could probable accept the pre-loading as there would be no really tight radius curves.) How about a kayak? How about a key-ring? If it CAN'T be done, then it can't be done. -- FF |
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