I am building the MM Tantrum, and I am stuck. I can't figure out how the pull-pull system that operates the elevator works. The manual doesn't have a picture of the system, and I am lost as to how a few pieces of string will reliably operate the elevator of a plane. In the past, I have always hooked up the control surfaces with pushrods. Any help on explaining this system would be greatly appreciated.
Thanks
Unprof

I haven't seen this model up close, but when you have pull-pull control, you use two pieces of string for each surface. You tie one piece to each end of the servo. There are control horns on both sides of the control surface. You tie one string to the horn on one side and the other string to the horn other side. the strings should both be taught. This picture shows pull-pull control on the back of the a float. Thats about what i know about it. Hope it helps.

-John

Like Airborne 2007 said.
I have pull-pull on my 3DX and it works good. I used it on elevator and rudder. On ailerons I used push rods. Takes a little longer than pushrods but is lighter.
Use a string that doesn't stretch. Unwaxed dental floss works. Some kinds of braided fishing lines work too, like Spiderwire.
A really really long piece might stretch, but in the length you would need it doesn't.
I tied one end off at the the control horn, then used a Dubro Micro quick connector to slide a small piece of wire that I bent a loop in. Slide the wire half way into the connector then tie the line to the loop in the wire. This way the lines can be adjusted. I've heard of people using a sewing needle or small cotter pin in place of the small music wire I used. Do this on each side of the control surface and servo. Use the double arm servo horn.

John and Airborne,
Thank you very much for the help. The pic. was very helpful. I am glad to hear that it is a reliable system. It is a new plane for me, and I want the maiden to go well. Thanks again for the help.

Unprof