gmcullan
Veteran
Location: Southbridge, MA
| Wow, great wobble, looks like you were getting chased a little there at the end. That wobble could be a couple of things. Starting from the obvious:
1. Main rotor balance and tracking, including the flybar and flybar paddles.
2. Slop-free linkage
3. Pitch range properly set. Recommend no more that +/- 10 degrees.
4. Use the 40-tooth tail rotor pulley. This gives a 6/1 tail ratio versus the 5/1 you get with the 32-tooth pulley. The higher tail rotor speed gives better tail control with less pitch changes. Balance becomes more critical at these higher speeds.
5. A straight main shaft
If you've not tried an "injector-rod" main shaft, I highly recommend one. There are threads on this board that describe how to make one.
As for servos, I had been using S75's with no problems. I did destroy all three cyclic servos in my little "incedent".
I'm currently using these three REALLY inexpensive servos that I bought from CNC Machine. I figured I had nothing to loose if they . Surprisingly, they work very well.
Based on the video, my bet is that there is a slight bow in the main shaft, right about where the shaft exits the top main bearing, and certainly not higher than the swashplate.
As for the question on linkage setup, earlier in this thread I posted the lengths that I'm using. I'm too tired tonight to go find them, but they are there!
Gerry Cullan,
Blade CP, HB CP2, T-Rex 450 SE & SA, HDX300, MicroHeli Monster, Mini-Titan |
