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Building Tips and technical articles. => Building techniques => Topic started by: Fred Underwood on May 31, 2016, 06:14:56 PM
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I have a control horn question for the elevator on a profile, about 675 square, 66 oz. Given a 1/2 inch thick elevator, 1/2" square LE, ribbed, not sheeted, solid block in the horn attachment area with a Standard wire “U” connector. Will a dowel vertical through the blocks, with a vertical 1/8 wire or with a threaded 4-40 or 6-32 rod be sufficient for long term use. These are used in RC, but the forces in CL are a bit more abrupt and may be higher.
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I have that exact setup on my profile, its a full sized (700 squares) profile, pictures somewhere on here in my impact thread.
I use a hardware setup with a 6-32 bolt and two nylock nuts with an arm from RC stuff. It works pretty good for me
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OH BOY!! Show and tell!
I've never trusted that set up. Probably just fine, but I like the one in my picture. It's also easier to make the control surfaces removable, which all of mine are. The turnbuckle is a titanium piece for steering linkage on a car of some kind. The guy at the hobby shop gave it to me. It's too long to be practical in a full fuselage but works great here.
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One could make a shorter turnbuckle than that, if one had the right left-hand-thread die.
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The dowel method may not be everyone's first choice for a variety of reasons. The real question is about long term use in control line at a competitive level. Not trying to convince anyone to use it, but wonder if is more prone to failure than the more standard type control horn.
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Yes, Fred I understand. I led to believe back when I started this stuff again that sticking to the tried and true CL techniques was the way to go. I have never built or flown any kind of RC so I can't comment on that either. "Not trusting" is probably just a figure of speech.