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wire rigging

Hobbyking Flybaby

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Den Moran20/04/2019 03:51:07
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136 forum posts
18 photos

Hi, everyone,

I'm rebuilding the wing support system for a Hobbyking Flybaby (44" w/s), and need to make up the wire support system. The system leads upwards from the axle ends to two bolts through the wing, and these bolts feed wire back to the single fuselage point above the wing.

My problem is sourcing fittings that will carry the wire, (sourcing) the wire itself, and secure it to the fixing points. I know I could make them, but as there are twelve of them (three under/three on top of each wing) I'm hoping they are a manufactured item. The bolt size through the wing is 4 mm dia.. The upper fuselage point is secured by a self-tapper (although I'll probably bolt this with 4mm nylon bolts) .

I don't even know what these fittings are called! Help!

Thanks, everyone, Den, Swansea

Percy Verance20/04/2019 07:05:46
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7918 forum posts
152 photos

Hi Den

I'd have a look at what Mick Reeves has. He may have something ......

Model Boat specialits are another possibility. Quite often the fittings for model boats have their uses for us. I'd try Cornwall Model Boats for starters, but there are quite a few other model marine specialists too. The model boat side of the hobby doesn't appear to have suffered too much from the ravages of Hobbykingitis yet.........

 

Edited By Percy Verance on 20/04/2019 07:07:24

Don Fry20/04/2019 07:07:35
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3454 forum posts
40 photos

Having looked at a photo of one of these, the rigging is non functional, so dressmakers cotton sheathed elastic will do for the "wire". I can't think of much commercial stuff available, except some of the fittings used for "closed loop" or "pull pull" control systems. Be easier to make your own, as a small model like that will not be happy straddled with a load of heavy units designed for load bearing in much heavier aircraft.

Denis Watkins20/04/2019 07:07:50
3597 forum posts
166 photos

Here, at Modelfixings too Den,

**LINK**

Peter Miller20/04/2019 08:23:44
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9847 forum posts
1157 photos
10 articles

SOmetimes one can find proper turnbuckles on EBay and other places.

Controlline wire makes excellent rigging wire but as others have said if the model does not actaully need rigging wire shirring elastic from any haberdashers works real well and does not need tensioners

Andrew Ray20/04/2019 09:24:35
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688 forum posts
19 photos

As Don and Peter say if it is non functional or something like this steel fishing wire (but in a smaller quantity) either from your local fishing tackle shop or online. Buy crimps or make them from copper or brass tube. For the brackets use some thin brass or tin.

Den Moran21/04/2019 06:32:29
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136 forum posts
18 photos

Thanks, everyone. As the rigging is functional for this particular aircraft,, a necessary part of the wing support system, I'll go with the fishing wire et al, and use soldered crimps.

It's the brackets that are key to avoiding all that drilling and shaping. My hands aren't up to too much of that these days! Cheers, Den

Andrew Ray21/04/2019 08:15:12
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688 forum posts
19 photos

Den, you may not be able to solder fishing wire, it is usually coated. I use wire cutters on the crimp and enough pressure to do the job, across the tube and usually in 2 or 3 places.

Simon Chaddock21/04/2019 08:32:31
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5370 forum posts
2818 photos

If the rigging is fully functional you really do need turnbuckles to be able to accurately balance the tension as any discrepancy between the leading and trailing wire will effect the wing incidence out towards the tip, particularly as the load varies.

Don Fry21/04/2019 11:03:01
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3454 forum posts
40 photos

Sorry Den, I would never have thought a model that size would use functional rigging. An alternative to turnbuckles is a closed loop attachment (m2 thread one end, hole to attach wire/Dacron on the other), to a m2 clevis. I thin

Doc Marten21/04/2019 11:17:10
237 forum posts
2 photos

Fishing trace is good but I doubt it will solder as it's usually stainless steel so you'll need to crimp it OR (like in the old days of Pike fishing) using the nylon coated trace wire you could twist it then superglue it or melt the coating into a homogenus join.

Andrew Ray21/04/2019 11:28:15
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688 forum posts
19 photos

Simon, sorry but I don't agree, I have Duncan Hutson's prototype electric SE5a, built by Duncan himself. It is 50 something inch wingspan, the rigging is most definitely functional, it is not fitted with turnbuckles and uses fishing trace that is crimped. It flies well and any slight difference in the rigging of the wires is not noticeable. If it's good enough for Duncan it's good enough for me...except I would most likely use turnbuckles on something larger.

Martin Harris21/04/2019 11:36:17
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8478 forum posts
212 photos

If you use the crimped tube solution, we've found that an additional loop passed back through the crimp so that there are 3 wires in the tube means that the wires are forced into close contact and are far less likely to slip than a simple loop relying on the tube to wire point contact.

Doc Marten21/04/2019 18:29:55
237 forum posts
2 photos
Posted by Martin Harris on 21/04/2019 11:36:17:

If you use the crimped tube solution, we've found that an additional loop passed back through the crimp so that there are 3 wires in the tube means that the wires are forced into close contact and are far less likely to slip than a simple loop relying on the tube to wire point contact.

Top tip this and again used extensively in Angling by any decent fisherman.

Den Moran22/04/2019 08:49:39
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136 forum posts
18 photos

I agree about the 'top tip'!

As the four 'v's' come to single points, I've decided just to tension using the 'Spanish cramping' method, i.e. twisting, to take up slack, as I don't want/need the wires bow tight.

As usual, a really helpful response from everybody, cheerio, Den, Swansea.

Manish Chandrayan22/04/2019 09:30:58
554 forum posts
65 photos

If in need of turnbuckles look up here. Available from M1.2 to M3 thread size, different lengths and with loop or slot ends

Edited By Manish Chandrayan on 22/04/2019 09:31:10

Den Moran29/04/2019 09:54:58
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136 forum posts
18 photos

Thanks, Manish, but turnbuckles are a bit too weighty for this aircraft. I looked up the fishing supplies, and they have 'figure of eight' flat pieces, which, if I bend them slightly, will be ideal. Thanks every one, Den.

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