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Old Apr 30, 2011, 09:56 PM
You glass em; I'll bash em!
USA, FL, Panama City
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0.020 in. dia. steel wire

Greetings again! :-)

My rudder control wire broke at the servo and I need to run a new one through the teflon sleeve. It's 0.020 in. diameter (24 AWG?) and I'd like to know if it's a high carbon steel wire. I would think so, and would like to know where to buy some without having to fly to China..... :-o Is this stuff typical piano wire? Fishing leader? or what? I assume that it's not stainless steel as I used magnets to hold it to the inside of the pod while gluing during installation.

Thanks.
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Old Apr 30, 2011, 10:03 PM
I don't want to "Switch Now"
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Toronto (Don Mills), Canada
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FWIW, it might have been stainless.
There are two types: Martensitic and Austenitic. One is magnetic, the other not. No real indication of the quality, just different types.

http://www.micometals.co.nz/PDF/stai...&Corrosion.pdf

You can get all kinds of steel wire at mcmaster.com, but it might be easier to get guitar strings at a music store.
(Or from rcbuilder.com)

Pat MacKenzie
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Old Apr 30, 2011, 10:21 PM
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United States, MA, Waltham
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Guitar strings are pretty tough. I recommend them. I've used them for prop shafts on indoor ff rubber powered models.

Another source for small steel wire of various kinds is Small Parts. (smallparts.com, I think)
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Old Apr 30, 2011, 10:22 PM
You glass em; I'll bash em!
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Thanks Pat. I don't have time to wait for an order from Mcmaster's; and so if the music store isn't open tomorrow, guess I'll have to rob a string from my Alvarez! :-o

mike
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Old Apr 30, 2011, 10:25 PM
You glass em; I'll bash em!
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And thanks to you Lincoln. Appreciate the input.
mike
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Old Apr 30, 2011, 10:27 PM
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Don't be too sure about McMaster. They have a distribution center in Atlanta.

I live about 5 hours drive from their New Jersey facility, and if I order by some reasonable time in the afternoon (4? 5? 6?) I get stuff the next day, even with regular UPS.
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Old Apr 30, 2011, 10:28 PM
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Another possibility?

http://www.basspro.com/Malin-HardWir...t/8581/-170586

Pat MacKenzie
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Old Apr 30, 2011, 10:30 PM
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Quote:
Originally Posted by lincoln View Post
Don't be too sure about McMaster. They have a distribution center in Atlanta.

I live about 5 hours drive from their New Jersey facility, and if I order by some reasonable time in the afternoon (4? 5? 6?) I get stuff the next day, even with regular UPS.
Same thing here in Canada. If it is in the Ohio warehouse I get it by noon the next day at work. And most stuff is in stock.
(However they seem to be reluctant to take on new Canadian customers, so I order through work)

Pat MacKenzie
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Old Apr 30, 2011, 10:52 PM
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Quote:
Originally Posted by pmackenzie View Post
this is the way to go. get a spool of this and go to www.tailboom.com and get some properly sized teflon tubing and you can make pushrods all day long.

this is the method i use.
paul
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Old Apr 30, 2011, 11:49 PM
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Mike,
I use .018 stainless wire fishing leader (Malin #7 80 lb test hard-wire) on my planes. While it may not be as stiff as carbon steel wire, it has worked fine for me. It should do OK in your sleeve with little play. I'll get you a piece so you can be back flying soon.

Fred
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Old May 01, 2011, 12:13 AM
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AAAARRGH! I should put it in my signature line. All steel has about the same elastic modulus, in other words, it's equally as stiff. Now, if you push it into the plastic range, i.e. where it doesn't spring back, now you see a difference. But that's not stiffness! When you're bending it with pliers, it may FEEL like stiffness, but it isn't. If you make two otherwise identical springs with piano wire and the cheapest steel wire of the same diameter that you can find, they will both have the same spring constant until they reach plastic deformation. Pull an ounce on one spring and it will stretch the same as the other one does with the same load.
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Old May 01, 2011, 08:23 AM
Walter Roos
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Canton, Ga.
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0.018" to 0.022" SS fishing leader works fine. I prefer the 0.022" because the larger diameter wire does not have a tendancy to slip thru the horns or arms at the ends, is easier to work with, and usually doesn't kink if you hit your rudder on something.

But the heavier wire may add to any tail heavy problems, just depends on your model design etc.

I think most would agree that you really don't need music wire here. Although I do insert music wire when glueing the teflon tubing to the fuselage, to keep things as straight as possible and to use magnets for some glueing.

walt
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