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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Flybar Rod Material Question
08-03-2007 06:54 PM  13 years ago
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qb7

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Ottawa, Canada

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Flybar Rod Material Question
I am looking at making flybars for my Logo 10. Can any one with experience take a look at the following link and let me know if the rod specifications are what I could use?

http://www.spaenaur.com/view_pdf.asp?Page=E125

I will be using the 3mm rod(#865-286). The metal is "Chromium Vanadium Steel", however I know little about metal strengths concerning flybar application.
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08-03-2007 07:00 PM  13 years ago
Furious Predator

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Kitchener, Ontario, Canada

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i think generally mild steels are used, they are softer and give way a lot. thats a tool steel, it will be pretty hard, and you may run the risk of the rod simply snapping in flight.Shawn
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08-03-2007 07:11 PM  13 years ago
AirWolfRC

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42½ N, 83½ W

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You don't need to get that fancy with the wire.
Most anything at least one step above coat hanger or bailing wire will do so long as it's straight. just search for steel rod.
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08-03-2007 07:19 PM  13 years ago
qb7

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The rod snapping in flight is a concern if the rod is too hard. I just do not know what would be considered minimum spec for steel rods.

AirwofRC, I will take another look at that site and see what I can find. I just think it needs to be hard enough not to bend in flight during high rpm rotation.
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08-03-2007 07:34 PM  13 years ago
Busher

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Manchester, England

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I have used silver steel to fabricate flybars with, on most of my heli's upto a 23cc Vario gasser, they have all been ok and up to the job.
I stopped making my own when I got a raptor as it was not worth the effort because spare prices are very cheap

Busher
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08-03-2007 07:41 PM  13 years ago
AirWolfRC

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I just think it needs to be hard enough not to bend in flight during high rpm rotation.
? ? ? Think about that one. With high speed comes high centrifugal force, which does a good job of keeping the rod straight.
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08-03-2007 08:10 PM  13 years ago
Heavy_Iron

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Wichita, KS, USA

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That material is called A286 CRES 1/4 hard and it will do.
there is also a different heat treat veriety which is called full hard and it's brittle. Oh, it's a stainless steel.
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08-03-2007 08:11 PM  13 years ago
whirlyspud

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USA

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I've been using 5/32 music wire in place of stock 4mm flybars for about the last 20 years. It about a thousandth of an inch smaller in dia, but they work great, and they are cheap cheap cheap. You have to anneal the ends in order to thread them.

Mike
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08-03-2007 10:14 PM  13 years ago
qb7

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Ottawa, Canada

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Think about that one.
Yep.....kind of put my foot in my mouth on that one!
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08-03-2007 10:24 PM  13 years ago
qb7

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That material is called A286 CRES 1/4 hard and it will do.
there is also a different heat treat veriety which is called full hard and it's brittle. Oh, it's a stainless steel.
Heavy Iron, I will assume you mean the link to the Chromium Vanadium Steel rods. It sounds by your name that you are involved in metal works. I'm atuned to a little heavy metal once in awhile Iron Maiden, Iron Butterfly...but thats about it! Thanks ;-)

whirlyspud, I did hear of several people using music wire, but was told one has to really heat up the ends to thread. I don't know if I would go that far. I kind of what to keep it simple, otherwise I would be better off just buying the flybar rods from FX at $4.00/pair. But this is a fun thing to try. Maybe music wire down the road. Appreciate the sound input.
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08-03-2007 10:53 PM  13 years ago
whirlyspud

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USA

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Yes, you have to get them at least cherry red. Some people do it a couple times. Small butane torch works fine. I've not had one fail on me ever. Can't say the same for stock.

Mike
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08-05-2007 03:51 AM  13 years ago
Heavy_Iron

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Wichita, KS, USA

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Heavy Iron, I will assume you mean the link to the Chromium Vanadium Steel rods. It sounds by your name that you are involved in metal works. I'm atuned to a little heavy metal once in awhile Iron Maiden, Iron Butterfly...but thats about it! Thanks ;-)

No, Heavy Iron refers to large aircraft. Controllers often refer to something as N1234 Heavy.

well, anyways, that is actually perfect material you selected! I would have done the same thing since it's ductile enough to bend during the crash, can easily be threaded, it's strong enough not to bend and it would never rust. "piano wire" in my opinion is the worst thing anyone could have thought of. A286 which is made by Alcoa is called CRES the rest are not, but are the same.
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08-05-2007 04:33 AM  13 years ago
561Larry

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Abbotsford B.C.

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Flybar Rod Material Question
Are you referring to A-286 a Austenitic stainless steel - Superalloy
AMS 5525 C used in jet engine parts .Its a high strength-high corrosion resisting iron based alloy .I would think it would be to expensive for the RC-heli parts. Google AMS 5525 C.
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08-05-2007 05:05 AM  13 years ago
Heavy_Iron

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Wichita, KS, USA

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Correct
Are you referring to A-286 a Austenitic stainless steel - Superalloy
AMS 5525 C used in jet engine parts .Its a high strength-high corrosion resisting iron based alloy .I would think it would be to expensive for the RC-heli parts. Google AMS 5525 C.
It's not that expensive and AMS number is dependent on form and heat treat, so 5525 is just one example...
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08-05-2007 05:13 AM  13 years ago
Heavy_Iron

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Wichita, KS, USA

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Correction
AMS 5525 is NOT A286, it's 316 strip or sheet. Although, for this application who cares. I have many feet of wire hangers from a local dry cleaners any takers?
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08-05-2007 05:20 AM  13 years ago
Heavy_Iron

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Wichita, KS, USA

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BTW
I always laugh when i see advertisements "made of aircraft grade aluminum". WTF one alloy is only good for one particular task. this type of advertisement just tells me that manufacturer is stupid.

Now my RC car manufacturer explicitly says that parts are made from Al-7050-T7651 and I respect that!!!!
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08-05-2007 05:28 AM  13 years ago
561Larry

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Abbotsford B.C.

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Flybar Rod Material Question
Your right about the specifications , Ams 5525 C was just one I knew offhand .I would think that a stainless used in cutlery like type 410 would be a better but if I wasn't worried about minor corrosion I'd go with 4130 or better known as chrom-moly.
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08-05-2007 05:51 AM  13 years ago
Heavy_Iron

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Wichita, KS, USA

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4130 is very nice overall, but gets rust flakes like whore on a good night.
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08-05-2007 07:59 AM  13 years ago
Portblock

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Van Nuys, CA

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Hey Heavy_Iron,

As much as I agree with you about differnt material for different purposes, I dont see manufactures as stupid, its more of the masses that buy into the hype.

Just like everyone wants billet this or that, and carbon fiber here and there, I have see many times where carbon fiber is used incorrectly, but the manufactures make lots-O-money from it, becouse its simply what the market (masses) want.

As to those wire hangers, are they aircraft stewardess grade?

All in all, I do agree with you.
The voices in my head can beat up the voices in your head.
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08-05-2007 04:58 PM  13 years ago
TMoore

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Cookeville, TN

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W1 or O1 drill rod is cheap, ground to size and threads OK. You can get it at MSC, ENCO, Travers, McMaster Carr and other online sellers.

TM
Part 107.
The only ZERO flight hour certificate in the world.
It's like getting a driver's license without the driver's test.
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