Brian Bennett
Key Veteran
Location: Dugway/Tooele UT, USA
| I have been flyin one in my eco 8 for 4 years now. Works pretty well and really light, but will occasionally drift from center as the battery pack voltage changes near the flight time end if using a BEC. You will get use to this.
1. If you have digi trims set the increment to the smallest value- You use this to adjust the servo to stay in center without drifting left or right when stationary. You do NOT use it to adjust the tail pitch position for for zero-yaw at hover.
2. With a real tight set up you should be able to go with 80-90 % gain with out tail wag. I run the eco at 1450 rpm for duration and 85% gain. For acro I go with 1550-1600 rpm and 93% gain.
3. With the trims all at zero AND the servo in rate mode, adjust the tail blades to have about 5 degrees pitch and the servo arm horn 90 degrees to the line of the tail pushrod link this wil get you close to start.
3. Important with ATV's set to the maximum throw, Make sure the servo doesn't max out and bind on either side. If it does, change to the next inward hole (shorter distance form the servo center to the pushrod ball or clevice) on the tail servo horn OR the next outer hole on the tail pitch lever OR both if needed.
4. Switch to rate mode, and adjust the trim so that the servo arm stays at the center and does not drift to either side.
5. Turn off all revo mixing and inhibit the tail pitch-adjust on the throttle hold. These will only confuse the servo and cause it to drift from center (step 4)
5. Set the gain to about 70 % to start. In HH mode bring the heli close to taking of f. Do this on a surface which the tail can yaw with the heli light on the landing gear. Adjust the push rod length so the heli doesn't yaw on lift off. It will take several adjustments, be patient , its worth doing this right.
Do NOT use the trim or sub trim to try to adjust for the needed tail pitch at hover. This will ruin setting number 4 (above) Change the length of the tail pushrod to adjust. Yes this means land, spool down and adjust.
Note: This correct linkage distance / tail pitch value will change and need to be reset if you change number of cells, rotor speed, tail and motor pinion, or blade length.
6. Now set the gain as recommeded.
Following these steps will give a tail servo horn 90 degrees to the puchrod at hover and maximize the performance of this gyro. If you are accustom to a GY 401 or better gyro beware this gyro will seem much more mild, but is a solid performer if properly setup.
I have been using the HS81 servo for my tail and it has worked well. If I could find a faster micro servo I would try it. Email me if you have any other questions on the profi.
Cheers
--Gi |
