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Turnbuckles ain’t cheap

 
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danoliver



Joined: 01 Mar 2016
Posts: 12
Location: Cincinnati

PostPosted: Sat Jun 02, 2018 10:10 am    Post subject: Turnbuckles ain’t cheap Reply with quote

The subject of turnbuckles and their cost is not new to this site. But I’m gonna bring it up once again. I think I found a way to eliminate the turnbuckles on the drag and antidrag wires in the wings. If you look at the pictures of my experiment below you can see that I simpy doubled up the cable and crimped the ends at locations B and C. I tightened the turnbuckle and then crimped the sleeves at A and D. After that I just cut out the turnbuckle to be used someplace else. My question is to you all out there flying your Air Campers. Will these cables need to be retightened over time or is it a set it and forget it kinda thing?

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tkreiner



Joined: 06 Aug 2009
Posts: 185
Location: Spring, TX

PostPosted: Sun Jun 03, 2018 5:15 am    Post subject: Re: Turnbuckles ain’t cheap Reply with quote

That’s a neat way of tightening your drag and drag wires! Trading $1. For the sacrificial cable rather than $20 for a turnbuckle makes great sense.

That said, when I zoom into the picture I only see a single wide crimp rather than the triple crimp which is explained in AC 43.13. Perhaps this is just a demo of the idea, and not the way your crimps will be when you actually assemble the wing.


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Tom Kreiner
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taildrags



Joined: 29 Dec 2009
Posts: 1607
Location: Medford, OR

PostPosted: Sun Jun 03, 2018 8:11 pm    Post subject: Re: Turnbuckles ain’t cheap Reply with quote

Also, I can add my two cents to the question about the cable tension on the drag/anti-drag wires. I acquired 41CC shortly after the test time was flown off in 2004 and during every inspection from November 2004 till the present, including demounting and remounting the wings several times in several different climates and over time periods spanning several years, I have never detected any change in the drag/anti-drag cable tension. The cables on 41CC are fitted with turnbuckles but they remain safety wired in the position they were in when Corky first covered them some 15+ years ago in Shreveport, Louisiana. They resided in hot/humid San Antonio, Texas for 9 years and have been up here in cool and dry Oregon for 7 years now with no apparent change in cable tension. I think I would still install them if I were building from scratch, but experience may indicate that initial tensioning fixed in place may be sufficient until the wings are recovered.

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Oscar Zuniga
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Air Camper NX41CC "Scout"
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