Mark. . .youy can repair from the top by first removing the wax residue present from bagging. There are "degreaser" compounds that will do this, but any particular one may be harmful to foam. The technique is to dampen a cloth with the liquid, take a quick swipe over the area and then wipe it dry with another cloth so none gets through into the foam. You can practice of something else to see what the effect is, or if you are buying a degreaser, put a litle on a cloth to check what it does on foam.
Having removed the wax, do this: Wax up a piece of bagging Mylar. Mix up a little epoxy, probably the 15 minute stuff for more working time and dribble some in the crease. Place the waxed piece of Mylar over it, trying to judge what will fill the crease. Preferably stick it in a vacuum bag to cure with the section with the crease weighted down flat. Any excess epoxy will just feather out and flatten on either side of the crease. If you can't get the wing into a vacuum bag, you can use quick epoxy and manually hold the Mylar in contact so the excess will feather out. If the bond is good with the epoxy, it will restore the strength to the wing. If the epoxy is clear, the original paint, if any, will still be visible. ----- Original Message ----- From: "Mark Miller" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, September 09, 2003 8:08 AM Subject: [RCSE] Repair Question > Hi Folks, > > While out making the first flights on a new design > last weekend I spun in from low altitude after a hand > toss. This ship is a full house composite 2 meter with > a bagged foam core wing. The skin is 3/4 oz. cloth and > uni carbon for the first 2/3 of chord with Kevlar for > the last 1/3 in the Phil Barnes style. Anyway, I had > Way to much up trim suddenly. I hit a wing tip and > now have a compression failure of the upper skin. The > wing is still basically strong in that it not very > flexible where the failure is. I am looking for the > best way to stabilize the area so I can complete my > flight tests. The upper skin in the area of the > failure is concave. Should I just inject epoxy under > the failure area and put a strip of glass on top or is > there a better way. With the talk of molded vs foam > lately we have a chance to prove foams merit. > > Cheers, > > Mark Miller > http://www.isthmusmodels.com > > __________________________________ > Do you Yahoo!? > Yahoo! SiteBuilder - Free, easy-to-use web site design software > http://sitebuilder.yahoo.com > 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. > 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.
