bluesky123
Heliman
Location: Boulder, Colorado, US
| Hi All,
My question is: what is the length of the servo arms in the stock Blade? More pecisely, what is the distance between the servo output axis and the hole in the servo arm, where the control rod is connected?
I've recently assembled Blade CP by installing by own BL motors/controllers and servos to a $99 kit.
I used Polks X-micro servos, which seem to be of very high quality and fit the hely well. Unfortunately, 100% servo travel results in 0...20 degrees range of the blade pitch, which is way too much. Only after I reduced the servo endpoints and lowered the pitch curve in my Futaba 9C transmitter, the hely started taking off and the LED on ESC stopped flashing. But, as the excessively long servo arm together with reduced servo travel resulted in lower control force (force = servo torque divided by the servo arm length), the control seems to be too sluggish--e.g., when, after seeing the hely drifting right, I give the full left aileron, it takes the helicopter a second or two to stop moving right, tilt the rotor left, and start drifting left. Is this a result of insufficient servo authority?
My setup is:
Main rotor: E Cubed R/C Green Meenie brushless motor (same as CC Mamba), Kv 3600, with stock (10t?) pinion, CC Phoenix 25 ESC in Governor LOW mode; stock flat bottom blades.
Tail rotor: Short Feigao 12mm BL motor, CC Ph 10 ESC, GWS 3x2 DD prop
E-Tech 1200 3S LiPo battery
JR 410T HH gyro
The total weight is exactly 300g.
The hely was trimmed according to Bdavison's instructions, blade tracking looks good, CG is at the main rotor axis. I even moved the flybar wights towards te axis to reduce the flybar inertia...
I am looking forward to your insightful comments.
Thank you,
Boris |
