ORIGINAL: fiveoboy01
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Did the fix for the sticking collective. No difference, and I suspected that it wouldn't make a difference.
Maybe I did not explain it right but the heli is jumping around without ANY stick input. Also I now do notice the tail rotor goes berserk when the collective starts jumping up and down.
It seems to only do it at high head speed(I fly in idle up mode), if I give full negative collective it stops twitching around but as I bring it back to zero pitch it starts jumping again.
This is an electronic problem having nothing to do with the sticking collective, though I'm glad I went ahead and did the mod anyways.
Anyone have any ideas? Tx batteries are brand new, I changed them just in case.
The mainshaft also looked like there was a slight wobble at the very top of the rotor head so I removed it to check. Straight as a string.
Sounds like maybe a stripped servo or two....start there. If you've had a couple hard landings....those S-75's cant take much abuse and they're junk. CAREFULLY....unhook each servo (power off) from the swash and cycle the servo arm gently by hand full stroke each way. If you feel ratcheting....it's junk.