ORIGINAL: d plane boss
ORIGINAL Steve Campbell:
The kit-supplied elevator pushrod works fine, IF you don't follow the instructions. They tell you to mount the servo off to the side, when it should be centered. An offset split pushrod will give differential throw on the two elevator halves.
That's absurd!!!
You can get the end of the elevator servo arm as close to the centerline of the airplane by putting it on the side as can putting it in the center. Besides, as long as the rear clevices move the same distance - and they HAVE to if they're connected to the same pushrod, the elevators will move the same distance - no differential. Looks to me like you're putting two more links, another pushrod, and a bellcrank in the system needlessly - just more stuff to cause problems in the air.
Just put it together as instructed - you won't have any problems. I've flown mine for two years now with both a Saito 150 and a YS 140. You're gonna love this bipe.
d Plane Boss,
I agree with you, but look harder at that photo. The bellcrank is set up for a pull-pull rudder, attached via the link to the upper servo. The elevator pushrod passes over the bellcrank and is connected to the center servo. That rudder hookup is trouble for sure, looks to me like it's going to provide differential rudder. I would move the elevator pushrod to the inboard side of the upper servo, flipping the output arm so it points in towards the center of the fuse. I'd move that rudder bellcrank link to the other side of the center servo and attach it to the other arm on the bellcrank (the lower one in the photo). That would keep the movements of the servo arm and the bellcrank relatively parallel and also out of the way of the elevator pushrod. And finally, I'd put the throttle linkage on the outboard side of the lower servo, out of the way of the rudder link.
Just my two cents....