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I just assembled a C31-XR and the element to boom connections consist of two rivets and two bolts at each connection. The C-3 that I am starting to assemble has three holes at each element connector with only two rivets. The center hole on the element flange is not drilled through the boom. I am thinking about drilling the boom at that location and inserting a bolt through similiar to what they did for the C31-XR. What does surprise me is that the factory has not felt it necessary to respond to all of the correspondence on this subject. Are they trying to hide something? I would hope that is not the case because I have been very impressed with the service and product until I started hearing about the possible rivet problem. 73, Roger Huntley, W7VV Pete Smith wrote: > At 08:34 PM 2/27/01 -0000, Tyler Stewart wrote: > >Force 12 has had their problems with their larger antenna designs... > > > >Seems like almost all of the problems I've heard have related to large > >element mountings to the boom. I think perhaps I'll add a bolt or two to > >the larger element brackets on mine before I put them up. (I'm putting up > >C49xr's and probably 340N's). > > > >It's also possible they've changed the mounting hardware/method on later > >production runs. > > > >Perhaps Natan or Tom will comment... > > I hope they will, but in the meantime ... > > I recall that this came up a couple of years ago, and it finally became > clear that the problem with the big boom rivets occurred with the beefed-up > models (H or D?), because the rivets that were used on a relatively few > antennas were too short and were not set properly when the booms (with > their additional layers of material) were assembled. I wish I could be a > bit more specific, but the Force12talk archive is temporarily down -- I can > see the messages indexed, but can't bring them up. > > I had a reflector come off my top C-3, but that was cockpit error on my > part -- I used big metal tapping screws to reattach the element bracket > after I had removed it during an abortive conversion to a C-4XL, and the > screws weren't quite big enough to hold well. When we reinstalled the > reflector (which landed in a treetop from 97 feet -- talk about luck!) we > used two plated Class 5 bolts through existing holes in the bracket, with > Nylock nuts, and I KNOW it's not coming off again. > > 73, Pete N4ZR > Contesting is! > > The World Contest Station Database > is waiting for your input at > http://www.qsl.net/n4zr > > -- > FAQ on WWW: http://www.contesting.com/FAQ/towertalk > Submissions: towertalk@contesting.com > Administrative requests: towertalk-REQUEST@contesting.com > Problems: owner-towertalk@contesting.com -------------------------------------------- Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. Force 12 Web site: http://www.qth.com/force12 Submissions: send to Force12Talk@qth.com To unsubscribe: send a blank e-mail to Force12Talk-leave@qth.com Force12Talk Message Archive: http://www.qth.com/force12/list/force12talk For problems with the list, contact n4zr@qth.com |