Hi Serge, I looked at my post and I don't think I phrased it very clearly. The angle that I was referring to is the horn/lever. My thoughts were that the square tubing would give a flat surface to attach your L shaped horn part to. This way the L shaped horn could be attached to the square tubing in three places. Looking at the square tubing from an end view, you could have rivets left and right corner (of square tubing) attaching the L angle down to the square tubing-right in the corners for example. When you slipped this square tubing over the round tubing the rivets that are in the two corners of the square may clear the round tubing as you slip it onto the round torque tube. Then drill a hole through all the parts to attach with a bolt onto the flap torque tube. This way you will have the attachment in double shear, except for the L shaped horn. It will only have the bolt through one side of it but it will have the flat surface of the square tubing for a stronger twisting moment plus the extra rivets holding it in place on each side of the bolt going through the center of the square tubing and the round torque tube. If you use round tubing to attach the L shaped horn/lever arm then you will have a greater twisting moment on the bolt. This is where welding a lever onto a round tubing comes in handy. I know Vans aircraft had a few problems with their flap levers many years ago. There were several of the RV6 series that had one side of the airplanes flap lever arm break which made for a serious situation. When the flaps were fully extended and the lever arm attachment broke on one side, of course it would roll the airplane immediately. I can't remember if anyone got hurt but if you were close to the runway when this happened, it may cause a bad day. You want to make sure that whatever you come up with is very strong. I like the idea of putting small aircraft bolts through the lever torque tube to take the shearing stresses that will occur rather than a rivet. Larry H.
Serge VIDAL <[email protected]> wrote: Yesterday, I thought of something even easier. Why not: 1 - Cut a plug (made of Aluminum or Nylon) that will slip in the end of the tube, with a protrusion; 2 - Cut an aluminum L-shaped part to make the horn; one leg of that part will be horn, and the other leg part will be rivetted to the tube and the plug, thereby holding the plug in place; The L-shaped will have a hole that will match the protrusion, thereby preventing any rotational motion. In other words, the horn would be simple plates affixed against each end of the torque tube, and these plates would be retained two ways: by having a perpendicular leg rivetted to the tube, and by having a protrusion from a plug inside the tube going through them. I ain't no mechanical stress expert, but my feeling is that would be sturdy enough. And it would definitely be the easiest, lightest and less bulky solution I could make without welding. Actually, thinking of it, the protrusion could be made man ways: - Either simply letting the plug step outside the tube (big hole in the horn, then) - Or milling the plug to a smaller diameter (smaller hole in the horn) - Or drilling a hole through the plug and fitting a large rivet in (would probably need a couple washers to make the the protrusion thick enough) - Or putting a screw and nut through the plug. Hmm! Can't wait to sneak in my clandestine workshop in the cellar to experiment with that! Serge Vidal KR2 "Kilimanjaro Cloud" Paris, France "Larry H." Envoyé par : [email protected] 23/08/2006 19:55 Veuillez répondre à KRnet Remis le : 23/08/2006 19:56 Pour : KRnet cc : (ccc : Serge VIDAL/DNSA/SAGEM) Objet : Re: Réf. : KR> Flaps I am not sure if someone has already said this, I think they may have but if you take a piece of square tubing that will slip over the torque tube for the plaps, then take a piece of angle rivet onto one side of the square tubing and the other side of the angle will cover the end of the square tubing and round tubing inside of it. You could rivet the angle to the square tubing on the one side in each corner of the square tubing where the round tubing will not hit the rivets then bolt through the angle, square tubing and round tubing. Hope this makes sense. Larry H. Serge VIDAL wrote: What use were they sold for, exactly? (what application) Serget "Wood, Sidney M (Titan) @ TITAN" Envoyé par : [email protected] 22/08/2006 22:39 Veuillez répondre à KRnet Remis le : 22/08/2006 22:39 Pour : cc : (ccc : Serge VIDAL/DNSA/SAGEM) Objet : KR> Flaps My KR-2 has 6061 aluminum flanges for the flap bellcranks. I found them in the local True Value Hardware store. I drilled a 3/16-inch hole through the flange and ¾-inch aluminum tube to bolt them in place. Sid Wood KR-2 N6242 Mechanicsville, MD, USA 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. Serge Vidal KR2 "Kilimanjaro Cloud" Paris, France _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to [email protected] 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. Toute divulgation, distribution ou copie du présent courriel et des documents attachés sans autorisation préalable de son émetteur est interdite." " This e-mail and any attached documents may contain confidential or proprietary information. If you are not the intended recipient, please advise the sender immediately and delete this e-mail and all attached documents from your computer system. 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" This e-mail and any attached documents may contain confidential or proprietary information. If you are not the intended recipient, please advise the sender immediately and delete this e-mail and all attached documents from your computer system. Any unauthorised disclosure, distribution or copying hereof is prohibited." _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to [email protected] please see other KRnet info at http://www.krnet.org/info.html
