I was talked into installing a pull pull sytem for my rudder on a giant stinger..I have a good powerful servo but am hoping there are articles and advice as to how to do it right..and what pull assembly is best??

I prefer using a bell crank to eliminate line tension side loads on the servo.

The Nelson hardware is pretty spiffy stuff : http://nelsonhobby.com/bell.html

While some may prefer to incorporate a bell crank into the system, it's not needed for a single servo pull-pull. Go here and take a look for some info. The descriptions there referring to "bell crank" would be the servo arm.

http://www.swbmfg.com/rudex.html

Why is that. why would you want to put that big of a load on a single servo. i think its the only way to go if you have the room.

Although I really don't care to get into this debate again, what big load would you be referring to?

What debate are you talking about. you seem to get around.

Well i look at it like this when using one arm on the servo for p-p. the wires have to be tight there for that puts a load on the bearing's or bearing. depending what servo you use.

If you use the bellcrank. the wires dont have to be that tight. so less load. correct me if im wrong.

I didn't think the wires were supposed to be "tight" on a pull-pull. Just a little snug?

Hey, what can I say, I like a good debate. The only difference between a pull-pull with a bell crank and a direct hook up to the servo is cable tension at neutral. Flight load on the servo is the same either way. We're not talking ridiculous neutral position tension on the cables as it's not needed. The servo bearings aren't gonna wear out sitting at neutral. I use direct hook up myself and I personally know a few others who fly the heck out of their GS with direct hook up. Never seen a servo bearing wear out from it. I believe the last thread on this was titled "Pull-Pull Tension" in the GS forum.

I flew a Giant Stinger w/G62 for 3 years and over 450 flights with a pull-pull system going directly to a Hitec 645 MG servo. Never a problem.

Ahhh.....someone who knows what I'm saying! Thanks for pitching in Nogyro.

thanks guys..I was glad to hear you got so many flights..and thanks for the web sites the how to is great..I am really excited about my first gasser..I really appreciate everyones opinion.

I like the KISS system.

Nogyro, you have helped confirm my claim about the longevity of our Giant Scale Airplanes. I have an R&R Snapper that I built from plans that I have been flying for one helluva long time, I can't remember when I built it maybe as long as 6 yrs. I built it with a pull-pull on the rudder, using yellow ny-rods for the cables, have been using this setup on all my GS planes with one servo. Most of my planes have used a single S148 Futaba servo. I will say, the Snapper is not a very high performance aircraft, unlike the 27% to 30% Extras and Edges. The Snapper has a Quadra 52 on the nose turning an 18-8X14 Zinger 6500 rpm. The rudder has been the least of my problems, radios, dumb thumbs, and brain locks have been more trouble than the rudder.

Just my 2 pennys! LOL!!

Dale Walker