Kevlar?
 

Im looking to use a pull pull system on an ultra stick 120. Would 100 pound kevlar be sufficient? If not, what would? Thanx

Kevlar?
 

the servo being used is a JR 2721

Kevlar?
 

The 100 pound kevlar probably would work just fine. If it is braided (and probably is) that could be a problem though if a few of the strands started wearing through. Why not save yourself the worry and pick up some extremely fine cable at the fishing department? They have the copper crimps right there to go with it too. Getting the length right is easy. Run the cable through the hole, back through the copper crimp tube, and clear through the tube again. The final length can be easily adjusted before crimping the tube.

Ernie

Kevlar?
 

the kevlar is the one made by sullivan. and i dont think its braided

Kevlar?
 

could i double the kevlar and run two pieces on each side or will that do more harm than good?

Kevlar?
 

> the kevlar is the one made by sullivan. and i dont think its braided

Go for it! Let us know how you like the kevlar. How will you be attatching it at each end? I have used lots of light weight kevlar for pull pulls on my gliders. On those I simply tied knots in the end of it and applied a drop of thin CA.

Ernie

Kevlar?
 

so your saying that putting a double of kevlar on each side would just be more security and not an interference? If i try that ill try and post how it goes.

Kevlar?
 

Kevlar, while being a super material for body armor, and boat hulls, fails miserably at abrasion resistance. I tried the Sullivan Kevlar cables, with the supplied Sullivan hardware. After what seem (at least to me) like an abnormally short period of time one of the Kevlar cables let go. The end that was in the Sullivan hoop had frayed and broke. I went back to what I had been using for many years with no problems, nylon coated fishing leader.

Kevlar, like that other DuPont product Teflon, has been used to hype many a product, some benefited from it, some didn't.

There is one brand of coated Kevlar cable that seems to be doing OK in our hobby, but I can't remember the make at the moment. It has a coating on it that prevents it from rubbing on it's self, kinda like nylon coated leader wire.

Vince

Kevlar
 

Kevlar has lots of uses, I loved my vest. The Sullivan kevlar you metioned will fray quite easily. I have used it in pull pull systems in the past but no more. I found it starting to fray on a water rudder application that had very little time on it. Don's Hobbies offer plastic coated kevlar. I thought I would give that a try.

Kevlar?
 

K&S makes great Kevlar thread I've been using on Pull Pull for my 120 Ultra Stick, and my Magic. It is slightly more resistant to fraying than the Sullivan thread, but you still cant let it rub on anything during operation. I'm using a H9 pull pull wheel on one end, works perfectly, and on the other, 4-40 screw eyes. I tied miniature slip knots through the eyes, centered, and tightened them. Then secured the knot with a drop of thin CA. I put a small peice of blue shrinkwrap around this to preserve the knot, and to make it look better...
Hope this helps ;)

Kevlar?
 

Tricky Chick:

EMS/Jomar sells 180lb aramid rigging cord, with a percentage of carbon fiber. It costs $10 for a 20' chunk. Order on-line at:

http://www.emsjomar.com/

They do not include any crimp tubes, ar any other goodies in the package, that's all separate. This is an armored cable, highly scuff resistant.

You can use steel cable,
. but the aramid's much more able.

Bill.

PS: Aramid is the generic name for Dupont Kevlar. wr

Kevlar?
 

use the pull pull system that Don's Hobby Shop carries!! it's Plastic coated kevlar and resists fraying with the covering.Very sturdy!!! I haven't had one break yet or fray,He has 2 kinds one for smaller planes and one for larger 40% types.

Kevlar?
 

so the ARAMID (Kevlar 29) RIGGING CABLE is a type of no fray kevlar?

Kevlar?
 

I have use also the Dons Hobby Shop pull pull system and is great. I recommend it to everyone... They are three sizes available

Kevlar?
 

Kevlar 29 is ballistics graded Kevlar. To my knowledge, this is unavailable to the public. Kevlar 49 is what you would probably be getting. I just put Dons coated kevlar cable ina Sukhoi, it is very nice, I will use it on my next plane.

For your 120 U/S, You will have no problems with using the readily available Kevlar cord, as long as you take a few extra minutes to make sure nothing is scraping the cable. Its very simple. Good Luck ;)

Kevlar?
 

ChixwithTrix:
Yes.

Coulter_Dean

The data/instructions sheet enclosed with the EMS/Jomar aramid cord states that it is "Kevlar 29." More than this, concerning its compound, I do not know. But I use it, and am happy with it.

Aramid cord is a Go-Go,
. Nylon? That's a No-No.

Bill.

Kevlar?
 

Hey thats cool, I didnt know I could get 29. I'm gonna set me up an order! :D

Kevlar?
 

i installed the Kevlar 29 from EMS/Jomar and am worried about one thing. When the kevlar comes out of the tube at the exit, will it start to fray or get less stronger? The cord is rubbing up against the end of the tube when it comes out. If it will cause a problem, how can i fix it??

In the pic, see how the cable has to turn to be able to hook up to the rudder? thats where it is rubbing.

Kevlar?
 

Chix:

Supposedly that wont hurt it, but I wouldn't leave it that way. If you can get the tube out, warm the end and bend it to follow the curve, letting the cord come out straight. If you can't get it out warm it carefully and bend it in a bit. I'd go ahead and pull it, even if I had to replace the cord afterward.

Twin with pull-pull,
. Feels like my pot's full.

Bill.

Kevlar?
 

so how would i go about heating the tube? When i do heat the tube, should i remover the wire?

Kevlar?
 

Chix:

Yes, pull the cord out for safety. I don't know how the heat would affect it. Probably no affect at all, but be safe. If you can pull the tube, warm it with your heat gun, then hold the bend until it cools. If you form a close fitting wire to the shape ypu want and stick it in the plastic before you warm it, then it will be perfect when it cools, and you wont have to use your fingers messing with the hot plastic.

If you can't, or don't want to pull the tube, still use the heat gun, (being careful of the covering) but you will have to use a wire this way. Just stick it in 1/8" or so, just enough to use it as a handle. Stick it in too far, it will absorb the heat, you wont put a bend in the tube. Keep pressure on the tube with the wire as you heat it, and stop heating when the tube lets go. If it's not bent enough when it cools, do the warming bit again and recheck.

As I said, I'd pull the tube to do it.

Hope this helps.

Pull-pull, and a twin,
. Man, you're "In like Flynn!"

Bill.

Kevlar?
 

Aerospace Composite sells a nylon coated kevlar called KevCord. They also sell these 4-40 bolts with a hole in the middle. On the surface end use the bolt and simply knot the kevcord and pull tight. On the servo end use a sullivan 4-40 eyelet, but make sure it is smooth (no burs). Knot the kevcord and put a drop of CA on it. Great system.

Craig.

Kevlar?
 

And the servo side...