Half pull-pull / Half push rod?
 

Has anyone used a setup like this? I must admit I just hate the idea of an old-fashioned half-meter long push-rod running through the middle of my model. But on my SE5a, a pull-pull system all the way to the elevator just won't work. For every good scale reasons the elevator is actually operated by an arm on the music wire joiner for the elevator halves. So what I'm thinking of doing is setting up a very short push-rod on a bellcrank set up at about the stab LE and then have the bellcrank operated by pull-pull cables. Actually because of servo location and space, there will also need to be a bellcrank on the other end.

Is this just silly of me?

RE: Half pull-pull / Half push rod?
 

Sounds like a creative modeling solution to me. I did something similar in a WWI model in order to get the servos as far forward as possible.
WT

RE: Half pull-pull / Half push rod?
 

Im for simplicity in a day to day plane, but you can do that and I am sure there are real planes out there with something like that too.

RE: Half pull-pull / Half push rod?
 

Abu, I did that on my Handley-Page O-400. Worked fine. Similar setup with a perpendicular pushrod to work the twin rudders.
Chuck

RE: Half pull-pull / Half push rod?
 

I did it too on a busa P90. Worked great for several years. I've heard it called a tiller setup.
Edwin

RE: Half pull-pull / Half push rod?
 

Ive used the set up several times too. On small stuff, big stuff, WWI, WWII. On bigger stuff I try to use ball links on all internal links to give a very positive slop free set up. Don, I'm dissapointed you aint doing the closed loop elevators, shame on you!!!:D

My 1/4 scale Se5 uses the same set up for elevator drive, belcrank under the tailplane with a short 3mm rod and clevis.

Ian.

RE: Half pull-pull / Half push rod?
 

The Hanriot HD 1 was like that as a full scale and Glen duplicates it in his kit. I need to get back to work on it as soon as the weather warms up so I can get back in the shop.
Doc

RE: Half pull-pull / Half push rod?
 

No; it is just a good solution.

A similar one (at least on one end):

http://www.mts.net/~mhultin/Camel/Ca...truction_4.htm

http://www.mts.net/~mhultin/Camel/Ca...truction_2.htm

RE: Half pull-pull / Half push rod?
 

Abu, I've used a cable push-rod and pull-pull "hybrid" setup on my current nieuport build, and it works well!
A good solution to get the servos far foward and bypass obstructions.