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250 Class Electric Helicopters 250 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


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Old 09-06-2014, 04:00 AM   #1 (permalink)
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Default 250 carbon tail push rod

Well seen some people on here have done this before,

I had some trouble getting some tube with the correct dims,

Went to my LHS yesterday and managed to pick up some 3mm tube with 1.5mm ID, all I could find on the internet was 3x2 out x in, so I picked that up, as I did not want to cut up my original push rod as I want it as a spare I had to pick up a couple of links, low and behold they had zero 250 links in stock, after searching through their spares I found a couple of blade links for the 200srx that was the same diameter and all thread,

Picked up some epoxy, and home to do the job,

Cut to length and epoxied the ends in, the full thread of the rods will help with bonding I hope,

Original rod was 2.4g and I thought the new rod would top this a little but in the end came in at 2g dead, just tried it and the high pitched buzz from the original is gone and the carbon rod has zero flex, next to fly it, but will have to wait till later for that, :-(
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Old 09-06-2014, 04:28 AM   #2 (permalink)
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Hmm, weight saving, more stiffness, and no guide for the rod?

Pictures please, I think I know my next bit of tinkering on the 250 :-)
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Old 09-06-2014, 05:40 AM   #3 (permalink)
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Here you go, was in a rush to try it, and it needs a bit of cleaning up, did not notice until I seen it close up in the

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Old 09-06-2014, 05:44 AM   #4 (permalink)
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Having trouble putting multiple pics in
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Old 09-06-2014, 05:46 AM   #5 (permalink)
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Old 09-06-2014, 05:46 AM   #6 (permalink)
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Old 09-06-2014, 05:49 AM   #7 (permalink)
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Yeah, It's a good mod that. I've never used the original guide, I cut mine up to make the CF one, and I've never had any trouble with tail wag or tail hold.

I've got no pics of it, but I just measured the distance between the NON threaded length of the rod and cut my CF rod to that, then cut the original rod at both ends, leaving about 26 mm of NON threaded rod to insert into the CF rod, It is important to rough up the non threaded rod that you are going to insert into the CF rod with a bit of sand paper or something to make sure you get a good bond. I just used a diamond cutting disc to lighly rough it up. I just used CA (super glue) rather than epoxy to bond mine. Coat the inside of the CF tube with glue using a needle, then coat the metal rod and insert it into the CF rod leaving about 1mm of non threaded rod sticking out. Do the same with both ends and leave it to cure, preferably over night. I tapered off both ends of the CF tube slightly to make it neater, then coated the tapered ends with another coating of CA to strengthen it up a bit more. Some people wrap thread around the ends of the CF rod and super glue or epoxy over the top of that to add yet more strength, but I didn't bother with that.

I've had two fairly big crashes with my 250 with this push rod in place and it's still fine.

EDIT:- Mine looks practically identical to Slobberdog's Just the tapered ends that are different. Good work mate:-)

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Old 09-06-2014, 05:56 AM   #8 (permalink)
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Hmm, sounds easy enough. The only other question I have is that I saw T3chdad mention in his thread that he found some aluminium tube which was lighter than CF. I suspect CF would be stronger and easier, but I'm curious what the weight difference is.

https://www.helifreak.com/showthread.php?p=5914783
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Old 09-06-2014, 06:01 AM   #9 (permalink)
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Thanks mate it was so easy, I did want two swash links, because of the threaded end that would have aided bonding but got the blade parts to do the same job, have about 15mm inside the tubing and enough tubing left to do another two, as I cracked my first attempt while cutting,

I just rounded the ends slightly to take away the chance of catching the rod, but it was your thread I think I found and followed so thank you,
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Old 09-06-2014, 06:11 AM   #10 (permalink)
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Quote:
Originally Posted by myxiplx View Post
Hmm, sounds easy enough. The only other question I have is that I saw T3chdad mention in his thread that he found some aluminium tube which was lighter than CF. I suspect CF would be stronger and easier, but I'm curious what the weight difference is.

https://www.helifreak.com/showthread.php?p=5914783
I think your gonna be talking 0.x of a gram, can't see it being that much and performance to weight will be better with CF,
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Old 09-06-2014, 06:11 AM   #11 (permalink)
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No worries mate, I thought I'd posted something similar a wee whiles back

Myx, I'm not knocking TechDad's idea, in fact, using Alu might be a better idea, as it can't possibly split like CF can. as for the weigh, I no idea, but probably 6 and half a dozen. The alu would be more likely to bend in a crash, but the CF could split.

The only concern I'd have with using Alu is that it might be more prone to resonance issues, but then again, it might not. IDK.

Oh, BTW, you might well already be aware of this, but when cutting CF you should always wear a mask. CF dust is not good to get in the lungs.

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Old 09-06-2014, 06:24 AM   #12 (permalink)
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Completely of topic, but I went to my flying field to fly my 250 today. We have near perfect conditions today, but when I got there, there was a junior football match going on and the place was mobbed. The cheek of it!! Using MY field for what it was originally intended. It's just not on you know! It's just not on!!! LOL!!

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Old 09-06-2014, 07:51 AM   #13 (permalink)
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Quote:
Originally Posted by Miracle Boy View Post
Completely of topic, but I went to my flying field to fly my 250 today. We have near perfect conditions today, but when I got there, there was a junior football match going on and the place was mobbed. The cheek of it!! Using MY field for what it was originally intended. It's just not on you know! It's just not on!!! LOL!!

MB
Lmao how inconsiderate
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Old 09-21-2014, 02:36 PM   #14 (permalink)
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Hey guys,

I'm starting to prepare for my attempt at this, but I haven't worked with carbon tube before and I have a few questions.

I've found some 2.5x1.5 carbon tube, but I'm unsure if my threaded links are 1.3mm or 1.5mm diameter and since I'm fairly new to modelling and glues and have never even considered gluing carbon fibre to metal before this I'd like some input on the best glue to use.

If my links are 1.5mm diameter I'm thinking CA, but if they're 1.3mm I suspect an epoxy might give a better bond. Whichever I use I'm planning to roughen all the surfaces first, and will probably re-enforce the end with a little epoxy once everything's set.

I've also found some 21mm turnbuckles for the 250, so I'm planning to use one of those at the tail end. That'll turn the entire pushrod into one giant turnbuckle so I can fine tune the tail :-)

Myx
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Old 09-21-2014, 03:13 PM   #15 (permalink)
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I would suggest using epoxy. Be sure to rough up the surface of the metal and make sure it is very clean (solvent wash with alcohol, nail polish remover, etc) before gluing. Also, wrapping with some polyester-reinforced cotton thread will help to prevent fracturing and/or fraying of the CF. Applying a little shrink tube at the end will cover any cosmetic imperfections.
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Old 09-21-2014, 03:49 PM   #16 (permalink)
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Quote:
Originally Posted by Harbormaster View Post
Applying a little shrink tube at the end will cover any cosmetic imperfections.
Adding things to a 250? Surely you jest ;-)
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Old 09-21-2014, 04:12 PM   #17 (permalink)
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Quote:
Originally Posted by myxiplx View Post
Adding things to a 250? Surely you jest ;-)


Here's Bert's video on building a CF rod. Skip ahead to 17:00. [ame]http://youtu.be/A_uWhVH5bko?t=17m[/ame]

Last edited by Harbormaster; 09-23-2014 at 10:04 AM..
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Old 09-22-2014, 03:46 AM   #18 (permalink)
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Thanks buddy, I'll measure up my links today and get some parts ordered
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Old 09-22-2014, 05:33 AM   #19 (permalink)
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the link rods are 1.3mm, so the 1.5 id is what I used, and I epoxied them in,

just made one for my 450 as well but fitted the whole rod inside the tube as was not worried about the weight on that,
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Old 09-23-2014, 07:24 AM   #20 (permalink)
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All done, one very nice looking carbon tail turnbuckle, with a total cost of maybe 15.
  • 2.5mm x 1.5mm carbon tube
  • HeliOption titanium turnbuckles
  • One spare rod and ball link
  • Glue & thread

These little HeliOption titanium turnbuckles are just perfect for this. At 0.22g including one ball link they're exactly the same weight as the threaded links I have:


Once the carbon rod was cut to size the components came to 1.34g in total:


Assembly was a piece of cake after watching Bert's video. I applied epoxy to the turnbuckle and threaded rod, and carefully glued the r/h thread of the turnbuckle in at one end of the carbon tube, and the regular threaded rod the other. After leaving the Epoxy to cure I added a little CA to the outside and wound some strong thread each side. That'll definitely stop the carbon tube splitting, and it still looks pretty neat in my opinion.



The glue and thread added hardly any weight, so the final result is a 1.35g solid carbon turnbuckle for the tail.



Lovely :-)
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