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HelicopterScale Model RC Helicopters › linkage rod question
09-01-2009 01:11 PM  8 years agoPost 1
ivorz

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Heli Wonderland

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I am in the process of finishing off my cobra (approache engineering) and noticed that the linkage rod for the tail is not threaded on the side that connects to the link (see image). How is this supposed to work. Should I replace it with a threaded link or are you supposed to glue a link to the rod.

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09-01-2009 04:33 PM  8 years agoPost 2
Joel Rosenzweig

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It is probably meant to connect to a different fitting, such as the one in this picture: Sorry that I forget their name!

http://us.vario-helicopter.biz/shop...oducts_id=30683

Take a look at the two cylindrical pieces on the right hand side (underneath the two black screws). You would use one on the tail rotor bell crank. The pushrod goes through the hole on the side of the cylinder. A screw is used to hold the pushrod in place. The whole assembly pivots on the bell crank. It actually works pretty well.

Alternatively, you can thread that rod and put a ball link on it.

Joel-

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09-01-2009 04:33 PM  8 years agoPost 3
garyl

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You could use a vario 97/9 push rod connector.

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09-01-2009 07:11 PM  8 years agoPost 4
Joel Rosenzweig

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Right. That's the same part.

Joel-

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09-01-2009 08:05 PM  8 years agoPost 5
AdeH

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Kent, UK

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One thought

I had something similar on a Hirobo Cobra.

If you can thread the end I would.

I didnt have that option so opted to solder a connector with a ball link attached to the other end on mine.

Worked fine.

A

After scale everything else is a toy!

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09-01-2009 08:24 PM  8 years agoPost 6
garyl

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Right. That's the same part.
I was typing the reply at the same time you were Joel. You just beat me to the reply button.

What I do for a threaded end is cut a section off of a theaded ball link rod and drill it out. Then I silver solder it to the end of the rod. Then you can use a standard Vario ball link.

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09-03-2009 12:25 AM  8 years agoPost 7
ivorz

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Well I ran into another issue with this. The rod is not long enough. How is this possible. With everything tensioned up correctly, the rod is about 1.5 inches short. I am so confused at this point. Perhaps the kit I got was for another type of heli.

frustrated at this point......

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09-03-2009 01:56 AM  8 years agoPost 8
pvande

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FL - USA

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Easiest thing to do is to pick up a thread coupler from your local hobby shop and CA it onto the end of the rod.

Then you thread your ball link onto that - no soldering required and it will add more than an inch to the length of the rod...

This is how I did mine..

This is what the thread coupler looks like - make sure you get the right size per the linkage rod diameter...

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09-03-2009 02:26 AM  8 years agoPost 9
Joel Rosenzweig

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Why not just PM Dr. Tim and ask him? He will set you straight..

Joel-

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09-03-2009 01:34 PM  8 years agoPost 10
TRACERBOB

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Well, I don't know about CAing it on. I would consider filing a couple of notches in the rod and silver soldering the coupler on if you can remove the pushrod from the tail section. That sucker will never come off.

Life is hard. Harder when your stupid

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09-03-2009 01:49 PM  8 years agoPost 11
ivorz

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Heli Wonderland

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Can someone here give me a part number from Towerhobbies. I know it is a 4-40 but I ordered one which arrived yesterday and it was to big. I need some expert help on this as

This is what I found.

http://www3.towerhobbies.com/cgi-bi...p?&I=LXD924&P=7

and I thought building the heli was going to be tough.....

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09-03-2009 03:02 PM  8 years agoPost 12
TRACERBOB

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Closer than you think

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These are metric, 2mm
http://www3.towerhobbies.com/cgi-bi...p?&I=LXD893&P=7

Life is hard. Harder when your stupid

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09-03-2009 10:39 PM  8 years agoPost 13
geker

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lykens,PA

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+1 for getting in touch with DRTIM he is the man to get a hold of about that problem he designed the kit and would know the fix

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09-03-2009 11:47 PM  8 years agoPost 14
Dr.Tim

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Mojave Desert

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There are many methods to do this, One is to add a Solder Link ( http://www3.towerhobbies.com/cgi-bi...p?&I=LXD894&P=7 ) and the other is to use a ball link .. ( http://www3.towerhobbies.com/cgi-bi...p?&I=LXD896&P=7 ) Then there is those clamp type connecter that screws onto the control arm of your tailrotor. I like the ball link method and there are more but these are the easiest.

Hope this helps and all you have to do is email me anytime!! I will get back to you with ideas about your model.

Dr.Tim

From Simple minds come simple ideas! Approach Engineering

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09-08-2009 02:39 AM  8 years agoPost 15
aashu

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scotch plains, NJ

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Dr

Dr Tim listed everything. Here is another search result from Tower

http://www3.towerhobbies.com/cgi-bi...h+rod+connector

Garden State, NJ

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