Pull-Pull Systems
 

I'm looking for a source for pull-pull systems.... I've got a few planes I'm wanting to rework... I guess I could go the LHS and buy some du-bro 2x56 pull-pull kits for $6 a pop...

But I was hoping to get something in bulk... Maybe a spool of cable or even kevlar thread and a bunch of connectors...

What are you guys using? Source?

Pull-Pull Systems
 

Paul,

Walmart has stainless steel fishing leader material, and the crimper and connectors that go with them. Its good cable, and I guess if it can handle 120 lb fish, it can handle a 4lb plane, and the stresses that exudes.

Pull-Pull Systems
 

Before I moved from Houston I went to Morris and bought a bunch of pull pull stuff in bulk from them.

Try that.

For do-it-yourself...
 

Get some DuBro no 618 4-40 Rigging Couplers. They are 4-40 threaded pieces with a hole drilled thru the end. Then you can hook a 4-40 ball link to one end, and a 4-40 clevis to the other, with some SpiderWire in between. On something as small as a Fun-Fly, you could run the servo without a bellcrank..

Sullivan Pull-Pull
 

Sullivan has a pull-pull system.You get 30 feet of .032(1/32") stainless steel cable that's brass plated for easy soldering,and 30 feet of the yellow nylon housing.It's part # S522 for $8.95.The Dubro 4-40 and 2-56 cables will work with the Sullivan yellow nylon housing if you don't want to solder.

Pull-Pull Systems
 

I get mine from Walmart like stevezero. For about five bucks you can get enough stuff to rig 25 or 30 planes...works great....................John

same as above
 

kmart for coated fishing wire and 4-40 rigging couplers from dubro. on my last plane I put the wire right through the servo arm and just used the coupler on the other end.
I tried the kevlar and it's strong stuf but weakened at the connection points.

Pull-Pull Systems
 

I thread it through the servo arm and on the other end I cut off the threaded end of a 2-56 pushrod and bend a loop in it then thread on a clevis......simple........John

Pull-Pull Systems
 

What are the advantages of using a pull-pull system on the rudder? Can it only be used on the rudder?

Thanks-Brian

Pull-Pull Systems
 

Can be used on anything really but I use em on rudder and elevator. when the servo is pulling there cant be any slop anywhere but if it is pushing it might flex a little.

Pull-Pull Systems
 

My majestic pattern plane has a 6 wire pull pull system on it. two wires for the rudder, and two wires each for the split elevator.

Pull-Pull Systems
 

how does a pull-pull system work on the elevator???

Pull-Pull Systems
 

I will try to take some pics at lunch, and post them when I get back. Basically works the same as the rudder. Since my elevator is split into two halves opposite of the rudder, I have a wire on the top and bottom of the elevator half. The opposite half of the other elevator meet at the servo, to give proper input. Meaning the top of one will meet with the bottom of the other side, and vice versa.

Pull-Pull Systems
 

If you have a one piece elevator, then its the same type of connection as a rudder pull/pull system.

Pull-Pull Systems
 

My pull pull on my SuDoKhoi:

http://members.telocity.com/paulswan...oipullpull.jpg

http://members.telocity.com/paulswan...ipullpull2.jpg

Pull-Pull Systems
 

Can one of you guys with a camera take a pic of the spool of wire you get at Wal-Mart or K-Mart? I look and look for it, but cant find it. I want to use the wire, not spider wire.

Thanks,

Jon

Pull-Pull Systems
 

Me too.... I've seen lots of spider wire and really strong fishing line... but only short leader length (12") of actual wire cable...

Pull-Pull Systems
 

Eagle Claw makes them. Might not be as prevalent in the middle portion of the country. Being originally from FL, you couldnt go past the aisles there without seeing stainless leader material, due to all the salt water fishing.

Try Cabelo's, Bass Pro Shops, or any of the outdoor online stores. They should have it in a bulk amount.

This is just one at bassproshops.com
http://www.basspro-shops.com/servlet...rTarget=search


This would be the most bang for the buck. 600 foot spools, stainless steel available

http://www.basspro-shops.com/servlet...rTarget=browse

This was under the terminal tackle, header, terminals& accessories page.

Another brand:
http://www.basspro-shops.com/servlet...rTarget=browse

This is just a starting point. Nose around some.

I didnt make it home for lunch, so no pics. I will try to take some tomorrow.

Steve



Steve

Pull-Pull Systems
 

I wish I had of known ya'll wanted some.....I was at wal mart in Suffolk VA. the other day and they had it on clearance for 1 dollar per roll......John

Pull-Pull Systems
 

Heck if ya'll cant find it let me know and I'll pick you some up.

I don't know..
 

I like SpiderWire..I use 80Lb test..I have pulled up 14+ ft logs with it, towed a boat with it once. It is light, strong as all get out, light, easy to use. A guy I fly with wasn't convinced of it's strength..I tied some directly to a DuBro large control horn. Put that in a vice, tied the other end to a hammer handle. Pulled the SpiderWire thru the control horn. When fishing with it, if you get hung, you cannot just wrap it around your hand and pull, it will cut you to the bone before it will break. It will sure as heck strip the gears in any nylon geared servo before it breaks.

Just my experience...this is the aramid braid, not the monofilament BTW

Pull-Pull Systems
 

so with a elevator pull pull do u mount the servo sideways?

Pull-Pull Systems
 

You don't have to mount the servo sidways... Just route the cables thru a piece of inner nyrod and then out to the control surface... Like this:

http://members.telocity.com/paulswany/sudokhoi22.jpg

pull pull pics
 

Here are some pics of my majestic's pull pull system. This is on a .32-.40 sized pattern plane, that is getting an enya 80 four stroker on it :)

I know there are a couple of bolts missing, but I am recovering the plane, so i slipped the linkage back on it for the pics.

Pull-Pull Systems
 

Another pic

Pull-Pull Systems
 

and another view of the tail. There are actually small pieces of teflon tubing inside the pushrod tubes where they exit the fuse.

Pull-Pull Systems
 

i just dont get how a elevator pull pull would work without the servo being mounted sideways???

Pull-Pull Systems
 

Shortman, Look at the fuselage pic above. The two wire connection is the rudder. The 4 wire connection is the elevator. All 4 wires come together inside the fuse near the wing. The wires work just as a pushrod works with a servo mounted upright. As long as there isnt a severe bend in them, they move according to the geometry of the motion of the servo. Just look at it as a rudder p/p on its side at the surface, and normal at the servo. There is absolutely no slop in this arrangement, and it does allow you the ability to still have some elevator control in the event of one wire breaking. The 4 wire method only works on split elevators. It would be overkill to have it on a single surface elevator.

Pull-Pull Systems
 

Try fishing line...

Fire Line or Ripcord...(Copolimer=Kevlar)
150 yard spool isn't that expensive and ya don't have to worry about inteference..comes in a lot of different poundage.
Works great for tail struts, pull pull, etc..

Pull-Pull Systems
 

How do you connect the wire to clevis to servo?

Thanks-Brian

Pull-Pull Systems
 

I take a pushrod and cut off the threaded end and make a small loop in it and then just thread it right into the clevis........

pull-pull
 

The lightest way to do pull-pull is with the least amount of hardware. I use K&S #49 Kevlar from Tower Hobbies. It costs 2.69 for about 100 ft. I tie it directly through the servo horn and secure it with a drop of CA. On the rudder end I used a short peice of 2 56 rod with a loop in the end like jmulder. Very strong and light and CHEAP.

More Pull-Pull
 

Rudder end

Pull-Pull Systems
 

Does this hold well Razor Sharp? To me it would seem safer to just use a clevis or something. Have you had any problems with your setup?

Thanks-Brian

Pull-Pull
 

Not a problem yet. This is how Don Incoll does all of his wasps.

Pull-Pull Systems
 

Steve,
I looke around today in walmart, sporting stores to get a crimping tool, steel leader and sleeves. No luck!
Does anybody know where I can get this stuff in the area of Princeton? Otherwise I need to mailorder - any sugestions?

Thanks
Rainer

Pull-Pull Systems
 

Try a Bass-Pro shop....

Pull-Pull Systems
 

The further you go inland, the harder its going to be to find this stuff at walmart. Bass Pro shops, like Paul Said, is going to be a good bet. You could even call a local fishing tackle shop in your town and ask them. You'd stay local, and keep a small businessman afloat.