Many of you may face this problem: How to fix lama v4 blades vibration?
Here are some ways you may follow.
First of all, try the basic way first. To check the balance of blades by take them out, and put the middle on the tip of knife as a pivot. Then, you can add little strips of tape as balance weights.
Also, you have to check the servo, swashplate, rotor head, each blade, straightness of outer and inner shaft one by one separately to see if there is any jittering or vibration. After you verify that everything is no problem individually, now try to assemble them to see what would happen. But please note that even slight bent of flybar would cause vibration, in such case, better buy a new one.
After assembling, you may check again the blades by disconnecting another motor while testing one set of blade or flybar. Again, add tape to the middle of one blade, if vibration increase then work on another blade, otherwise add more tape on it until offset the oscillation.
Twist the blades to increase or decrease pitch. Since blades are elastic that it will spring back after twisting, you may have to repeat it few times. Adding pitch to the lower blade in this way would make it even better.
Tuning and setup involved in any kind of rc helicopter are about trial and error, be smart and innovative to the problem you faced and you will make it.
