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Home✈️Aircraft🚁Helicoptere-SABOther › Tail rotor control rod to threaded ball link stud..no warm & fuzzy feel
03-26-2020 02:28 AM  7 days ago
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utahbob

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St. George Utah

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Tail rotor control rod to threaded ball link stud..no warm & fuzzy feel
So I've been flying my 570 for a few weeks..decided to figure out a way to hold those things in better..there was no interference fit when I glued them in..so I have decided to make a couple of aluminum ferrules that will fit over the two diameters and maybe use small set screws to mechanically lock them together. Anybody come up with any other way to beef the situation up..I just don't trust even epoxy to hold up over time!
I do a great decending funnel!
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03-26-2020 01:08 PM  7 days ago
Rojoalfa

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Very interesting point.

My two miniature aircraft, spectraG and fury 91, have this configuration on the tail control rod carbon fiber...
Up to this time, this arrangement is doing OK and no problem. Epoxy is working OK with this glow and gasser helis.

In your post, you are talking about an electric heli, so no oil emitions that could cause problems with epoxy.

My recommendation?
Leave as it!

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Saludos cordiales,
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03-26-2020 01:23 PM  7 days ago
Rojoalfa

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Ok, I see your point...
The epoxy glue is in both choices...

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Saludos cordiales,
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03-26-2020 01:54 PM  7 days ago
JLF92677

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Southern California

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Instead of regular epoxy, I use JB Weld. Been using it for this same application and never had a failure in 25 years.

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03-26-2020 01:56 PM  7 days ago
Flyin for Jesus

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Troy, IL. 62294

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I use a long threaded rod that goes through the entire carbon rod.
1 piece rod will not come apart, carbon rod keeps it rigid.
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03-26-2020 06:45 PM  6 days ago
utahbob

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St. George Utah

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Interesting Rojo..is that Heli option an aftermarket part?I do a great decending funnel!
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03-26-2020 08:38 PM  6 days ago
JuanRodriguez

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The Villages, Florida

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And to add to JLF’s post , be sure NOT to use the “quick” version of JB WELD.......Been there, done that and old enough to know better.....
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03-27-2020 12:28 AM  6 days ago
Rojoalfa

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utahbob Interesting Rojo..is that Heli option an aftermarket part?
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Yes... I found this link...

https://world-of-heli.de/en/tuning/...aenge---go.html

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Saludos cordiales,
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03-27-2020 02:27 PM  6 days ago
whirlyspud

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USA

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I like to take a tap with a diameter slightly smaller than the carbon tube ID and use it to rough up the inside of the tube a little . I've seen more than one of these pull loose and the JB weld left on the stud was smooth as glass because the inside surface was smooth and it had nothing to bite into.
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03-28-2020 12:57 AM  5 days ago
utahbob

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Yeah that sounds like a good idea..since I have a lathe I'm going to make two aluminum ferrules with a close slip fit over the metal stud and counterbored for a close slip fit over the carbon rod and then have one set screw clamp down on the stud and two opposing set screws clamp the carbon rod..I also use jb weld and have had great results but the idea of possibly crashing the heli because of some glue letting go is unacceptable. Thanks for the replies guys!I do a great decending funnel!
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03-28-2020 01:21 AM  5 days ago
Rojoalfa

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The stock sab rod is threaded!
There shouldn't be a problem with that.

If this rod come out is because It wasn't a good installation.
You glue with epoxy, then thread it and then more glue on the top.

Let do some Calc...

High torque tail servo develop 4 kg x cm. (asume 1 cm of distance on horn)
At full torque, this piece glued with epoxy is going to drive no more than 4 kilogram.

J&B with just 4 kilograms?

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Saludos cordiales,
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03-28-2020 01:59 AM  5 days ago
Jerry K

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Houston Area

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This is the exact reason it is called a hobby and not golf!!!
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04-01-2020 02:37 AM  1 day ago
utahbob

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St. George Utah

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The O.D.of the threaded stud was smaller than the I.D.of the carbon tube..it just slipped in with a little slop.I do a great decending funnel!
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