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Old 08-26-2017, 04:35 AM   #1 (permalink)
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Location: sweden
Default Cyclic ring and Align 760x...

Im setting up a new system on a trex 760 F3C.
As im using the new F3C pitcharms, I have alot of mechanical resolution.
So the swash must move alot to get the desire pitch and cyclic rates I need.

This is on paper a good thing for F3C I guess. But also introduce some problem.
I use +-12 pitch, and 9 degrees cyclic for flying.
I must now reduce cyclic ring from 130% ( stock ), down to 78% to prevent binding at max/min pitch and max cyclic.
I know this condition is rarely meet during flying, but I dont like the ide to have mechanical binding on my helis.

So is 78% consider super low, and must be adressed. Or just go fly like this?

Thanks
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Old 08-26-2017, 08:36 AM   #2 (permalink)
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Join Date: Nov 2013
Location: Aberdeen, UK
Default

It's something you need to watch for even with the standard 700X and it's shorter grip arms, so with the longer grip arms of the 760X I cen see that it will be a real issue. The problem is really the shape of the red alloy heatsing/frame stiffener which gets in the way of the servo arms at the top of their travel. Some people take a Dremel or file to the heatsink which is effective, but not the prettiest solution.

Without butchering the heatsink you can get a bit more movement by trimming the excess thread off the ball links, because it's the thread sticking out of the front of the arms that hits the red alloy heatsink/frame stiffener first. You can increase travel further by adding spacers under the aileron and pitch servo mounts to move the servos back a little. This gets you to the point that the servo arms clear the alloy heatsink completely.

Next thing that the arm hits is the top part of the frame. You can sand a small notch in the frame to get some more travel if you want to go to that extent but even without doing that you should have already gained a lot more travel.
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