Need help with Trex 700N?

[drrm123]

I finished assembling my Trex 700 about 2 weeks ago. When i tilt swash it goes forward, backwards and to the right and left sides ok when not running. when i start it and do the sme thing it tilts to the left when given forward elevator like i gave it left aileron? what do i need to check? have futaba 9zp radio and swash is set to sr3. included 2 minuted video:wow2:. thanks for any help. YouTube - Trex 700N

[jwilkens]

The setup (mechanically) looks fine.

Have you tried that with the heli off the ground?

I you give hard forward elevator on the ground the rotor disc will move and tilt left. Similiarly if you give back elevator it will tend to move right.

[Skarn]

You know, my Raptor is having a similar servo issue....when not started, everything is great. But as soon as it starts, the throttle servo goes wacky! It is on a PCM tx/rx...I'm not familiar with your TX...is it 2.4 or PCM?

Anyway, I haven't had time to prove it yet, but it hit me the other day...on all my planks that I fly PCM with, I wrap the receiver in foam to isolate the electronics from vibration....but on my Raptor I only have the receiver velcro'd to the heli. So my theory is that if I at least mount it with foam instead of velcro, it will be ok.

Of course, it's only a theory but might be worth lookig into if you receiver isn't isolated from vibrations....

Skarn

[drrm123]

I think i may have figured it out, will verify after work today. i think i need to set swash to S4 and not SR3. I have 2.4 gig module on radio orginally was PPM a & PCM radio. as soon as i tried to lift heli off ground it would tip to the right as it did in the video if given any cyclic input.

[drrm123]

Figured it out, SR3 was correct. Flybar paddles were not level. :)