Hi all; I attended a EAA workshop this last weekend here in Indy on "Composite Construction" among others and the instructor mentioned that all aluminum should be treated with "Alodine" as a final step prior to gluing them in with T-88 epoxy and he also mentioned that you need to keep them in a sealed container where they can be kept contaminent free (finger prints, dust, ect.) untill final installation on a very low humidity day. It was a very good workshop and I also found out that I can get my A&P licence and my State will pay for it, so I'm off to school again.
Regards, Dan F. ----- Original Message ----- From: "Larry H." <lah...@yahoo.com> To: "KRnet" <kr...@mylist.net> Sent: Wednesday, August 23, 2006 1:45 PM Subject: Re: Réf. : Re: KR> flaps/PREP Your welcome Serge. Larry H Serge VIDAL <serge.vi...@sagem.com> wrote: Thanks for the advicce, Larry! I had no idea an Alodined surfaced could be glued. I treat all my aluminum parts with Alodine, essentially because I like the finish. Now, you just gave me an extra good reason to do so. Being the paranoid I am, in any case, I will make a rediundant solution: glue PLUS rivets. Serge "Larry H." Envoyé par : krnet-boun...@mylist.net 22/08/2006 20:42 Veuillez répondre à KRnet Remis le : 22/08/2006 20:42 Pour : KRnet cc : (ccc : Serge VIDAL/DNSA/SAGEM) Objet : Re: KR> flaps/PREP As food for thought, if you were going to glue two pieces of aluminum together you may want to rough sand the two surfaces to be adjoined so the adhesion would be stronger because of the roughness just like anything you glue or paint. If you choose to do this then you have probably removed any corrosion resistance that may have come on the tube or sheet from the factory that made it. In this case it may be advisable to apply aladine to the surface to seal the aluminum from corrosion in the future if you did sand the orginal coating off. The reason I am bringing this up has to do with LongEzes elevators. The original plans had you take the aluminum tubing which became your torque tube for the elevator, sand it down to rough it up for better adhesion, glue your hot wired air foil shaped foam trailing edge to it with epoxy. Then you wrapped the fiberglass cloth around the leading edge of the exposed tube and onto the foam to mate the two together and form the elevator. All was fine for a few years until there were some of the ezes that developed corrosion on the surface of the tubes and then there was no adhesion, the corrosion had caused the seperation. It seems very strange that an epoxy coated,sanded aluminum tube would be able to corrode, but obviously they can. The repair is to remake your canard elevator. The procedure now includes sanding the tube as before but now you aladine the tube before you glue the foam and fiberglass to it with epoxy. The aladine does not remove or fill the roughness sanded into the tube for better grip/adhesion it's job is to seal the aluminum to prevent corrosion. You all may already be doing this but I thought I would mention it just in case someone that didn't know may want to do this as an extra precaution. Non alidined sanded aluminum glued together parts may last way past our life times but never hurts I guess. The old saying is "If I knew better then I would do better" !! Larry H. Mark Langford wrote: > That is pretty much what I have in mind, except I would like to find (or > make) an aluminum flange to replace the clamp collars, then glue AND rivet > that flange to both the torque tube and the bellcranks. The tube stops > could be made the same way. I've used T-88 to glue some aluminum parts together, and I dare say nothing is ever going to separate them. It would be interesting to test what happens after a few freeze/thaw/hot cycles, but I'm betting they're more or less permanent. The part number for the clamp collars that I used is 6436k72 from Mcmaster Carr. They're for 3/4" OD tubing. I don't expect you to order it, but some other folks on this side of the pond might be interested. These are aluminum, and allow easy adjustment of range, limit, and synchronization between the two flaps. Next time I do this I may use a carbon fiber torque tube rather than 4130... Mark Langford, Huntsville, Alabama see KR2S project N56ML at http://home.hiwaay.net/~langford email to N56ML "at" hiwaay.net _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html " Ce courriel et les documents qui y sont attachés peuvent contenir des informations confidentielles. Si vous n'êtes pas le destinataire escompté, merci d'en informer l'expéditeur immédiatement et de détruire ce courriel ainsi que tous les documents attachés de votre système informatique. 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