Making pull pull hardware?
 

I've done some searching about pull pull setups and have learned a lot about geometry and tension. What I haven't learned is whether there are some cost effective alternatives to buying the hobby shop pull pull hardware. I know about the steel fishing leader, but how about attachment hardware or homebuilt control horns for the surfaces? I'm flying a .60 size bird with standard torque servos, so there's no need to go heavy duty with it.

RE: Making pull pull hardware?
 

I have on occassion done a few on old timers and and the larger old timer pictured has pull/ pull on both elevator and rudder primarily for CG consideration Also is a picture of my Schneider Sport with Pull/Pull done this way.

I use brass threaded couplers like these:

http://www3.towerhobbies.com/cgi-bin...?&I=LXD893&P=7

and flatten the large end then drill a small hole to thread the Spyder wire of about 16 pound test and tie. Drip a small bit of ca on the knot and your done. This is not steel wire it is some sort of synthetic, just like string but very durable.


John

RE: Making pull pull hardware?
 

Lately I've been looping the wire right through a standard control horn (just one one end) and crimping. Saves a few parts and a little weight. Obviously it comes at the cost of less adjustment and a more permanent approach.

I was going to try some left over fuel tubing for crimps on my next small project.

RE: Making pull pull hardware?
 

I use the steel plastic coated fishing leader, I have it in different tests for different size planes. I buy Dubro rigging couplers with the hole on one end and the threads on the other. They come in 2-56 or 4-40. For the holding/crimping pieces I have a lot of small aluminum and brass tubing. I just cut about 1/4 inch pieces, thread the line and crimp it. I then use a soldering iron and heat the crimp tube and it melts the plastic coating a little inside so the line will never slide out. It's been 10 years sense I bought any of the pre made kits and all my planes have had pull/pull rudder. You can make the back tiller from 4-40 all thread and buy the Dubro fiber ends . There are a lot of ways to do it. Like Joe mentioned, I have laced the wire through the horn and wrapped the wire and heated the plastic with a match enough to melt it together.

RE: Making pull pull hardware?
 

If ten bucks is to much, your in the wrong hobby.lol

RE: Making pull pull hardware?
 

That is true and most everything I use I buy at the hobby shop. Dubro pull/pull control arms kit, the rigging couplers, clevises. Only thing I use different is the wire itself and I get that at the Bass Pro shop. I do like the system I make up myself better then the store bought package though. I can select the items I like instead of what someone else thinks I should use. Saving money??? I would have to do the math but if I am saving some it isn't very much. I just get a better selection of stuff. I have made up my own control arms with 4-40 all thread but it is weaker then the Dubro.

RE: Making pull pull hardware?
 

I got it done. The packaged Dubro setup was $20 per surface, while my homebrew was about $5 per surface. I also have adjustability after it's all put together, which is a plus. I posted some pics in the "Tips and Techniques" forum for those interested.