Re: Re: [RCSE] CF pushrods
Actually, the Composite Store (cst.com) recommends that the CF pushrod tip be crushed (for glue penetration) and thin CA'd into the clevis or rod end. And with the "rough" threaded area of the clevis, that glue joint would be that last thing to fail (IMHO). --Bill On Sat, 10 Feb 2001 07:05:20 -0800 Bill Johns <[EMAIL PROTECTED]> wrote: "David A. Enete" wrote: > > >As an adhesive technologist I have absolutely no problem bonding CF > >pushrods with CA. > > I have a friend who works for Atlanta Gas Light in their Safety > program. Any time that he sees something questionable (ie. a floor > mat at the local fast food place is folded over on itself) he will > say, "As a safety professional I would have to say that this is not a > safe way to operate..." I just thought your "adhesive technologist" > statement sounded a lot like that. Sorry, I did not mean to sound pompous or to lecture. I was speaking from a stress-distribution, mode-of-load-application perspective. > I'm wondering what would have to happen in a fuselage in order to > remove the CA-fused carbon fiber pushrod from the link. Probably a > pretty hefty crash. What would have to happen to a fuse in an "unplanned" manner? I suspect a bending mode with eventually snap the CF off at the linkage. Beyond that, I'm sure you could pull the CF out of the fitting, but the load required would be exceptionally high. I say that because given the right testing machine I can break any bonded joint. The inherent strength of the CF rod and the excellent joint design of fitting a round section into a round hole with a reasonably tight fit, would lend to excellent joint strength. Adhesives work best in shear. On top of that, use a very good adhesive, CA, and you have a very good system. If anyone is actually bothered by gluing a CF rod to a clevis, hey, no problem. Use a different method of making the push rod. That's what living in a free country is all about. ttfn, Bill -- Talk is cheap because supply exceeds demand. Bill Johns Pullman, WA .. RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] CF pushrods
>"As a safety professional I would have to say that this is not a > > safe way to operate..." I just thought your "adhesive technologist" >> statement sounded a lot like that. > >Sorry, I did not mean to sound pompous or to lecture. I was >speaking from a stress-distribution, >mode-of-load-application perspective. Um...I thought it was funny, not pompous. Never mind. Darn computers just don't convey smiles or chuckles. I like the idea of using CA, and take your endorsement to heart. Next plane will have CF pushrods with CA bonding. >If anyone is actually bothered by gluing a CF rod to a >clevis, hey, no problem. Use a different method of making >the push rod. That's what living in a free country is all >about. I know that using CA doesn't bother me. I was trying to point out that it would take a pretty big force (with stress is bizarre directions) to break the bond of CA with CF pushrods and the links you described. - David [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] CF pushrods
"David A. Enete" wrote: > > >As an adhesive technologist I have absolutely no problem bonding CF > >pushrods with CA. > > I have a friend who works for Atlanta Gas Light in their Safety > program. Any time that he sees something questionable (ie. a floor > mat at the local fast food place is folded over on itself) he will > say, "As a safety professional I would have to say that this is not a > safe way to operate..." I just thought your "adhesive technologist" > statement sounded a lot like that. Sorry, I did not mean to sound pompous or to lecture. I was speaking from a stress-distribution, mode-of-load-application perspective. > I'm wondering what would have to happen in a fuselage in order to > remove the CA-fused carbon fiber pushrod from the link. Probably a > pretty hefty crash. What would have to happen to a fuse in an "unplanned" manner? I suspect a bending mode with eventually snap the CF off at the linkage. Beyond that, I'm sure you could pull the CF out of the fitting, but the load required would be exceptionally high. I say that because given the right testing machine I can break any bonded joint. The inherent strength of the CF rod and the excellent joint design of fitting a round section into a round hole with a reasonably tight fit, would lend to excellent joint strength. Adhesives work best in shear. On top of that, use a very good adhesive, CA, and you have a very good system. If anyone is actually bothered by gluing a CF rod to a clevis, hey, no problem. Use a different method of making the push rod. That's what living in a free country is all about. ttfn, Bill -- Talk is cheap because supply exceeds demand. Bill Johns Pullman, WA .. RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] CF pushrods
>As an adhesive technologist I have absolutely no problem bonding CF >pushrods with CA. I have a friend who works for Atlanta Gas Light in their Safety program. Any time that he sees something questionable (ie. a floor mat at the local fast food place is folded over on itself) he will say, "As a safety professional I would have to say that this is not a safe way to operate..." I just thought your "adhesive technologist" statement sounded a lot like that. I'm wondering what would have to happen in a fuselage in order to remove the CA-fused carbon fiber pushrod from the link. Probably a pretty hefty crash. - David [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
[RCSE] CF pushrods
I just got some .040 CF rods to use as pushrods in HLG's. Do people generally use these in sheaths, supported at intervals along their length, or just let them run free in the tailboom? TIA! Greg Stewart RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
