kosta
Heliman
Location: Melbourne Australia
| Eating humble pie 
Well after chasing my tail (pun intended  ) wag for five tanks of fuel, I got it sorted. At first I tried about a hundred different gain settings to no avail, I then changed ball link position on the servo both closer to center and further from center with closer helping a little but still wagging. Decided to change tail servo to s9254, but still the wag was there. Getting frustrated, I decided to change out the tail with the one off my EP10 which fitted nicely.
With my fingers crossed, I lifted off into a hover and wadda ya know, the tail was rock solid! Now the first thing I had checked after the very first hover was the tail bearings and they were silky smoothe, I mean the blade grip would spin under its own weight. I also pulled on each grip whilst turning it to simulate the outwards force when it's running and it felt smoothe. This checking I did was when the tail was still on the heli, but after I put the EP10 tail on and it didn't wag, I went and checked the original tail whilst off the heli. Everything still felt really smoothe until I pulled on both blade grips at the same time and tried to rotate the hub between the two grips with my fingers, it was damn tight and notchy! So after all my stuffing around with gain, linkages etc. shuttle and QWW were right, check and double check those flaming blade grip bearings  . Just goes to show how much load these bearings face. I'm not sure yet whether it's because my grips don't have thrust bearings or if the standard bearings are not suitable, but the EP10 grips don't have thrust bearings either so standards should be fine. I'll replace them and see what happens. Humble pie sure does taste bitter. Atleast hovering those five tanks wasn't boring .
peekay, if your tail doesn't improve, take it from me, check ya grips . The g231 I'm running seems like it has heaps of power and I'm pretty happy vibration wise, can't imagine the power of the g260. Hope we still have enough daylight left after work for more hovering. Kosta. |
. When I up the gain the wag is shorter but faster. Tonight I went one hole in on the servo arm, so we'll see if that has any effect tomorrow. If not I'll try some different gyro tape to see if that helps. The thing with the gears, it's not that they aren't round, it's the mounting holes are drilled off center. Mine were like that and I fixed it by drilling the holes in the gears slightly larger, centering the hub and then tightening it in place. Mesh is spot on. I've nipped up the header bolts, engine mounting bolts and boom support bolts after each tank, keep an eye on yours. Thanks for keeping us posted. Kosta.
. I like what you did with your bearing block, if I have problems and can't find flanged bearings I'll do the same as you
Four "taps" and no problem with bearing again.
