im brand new into this rc model building and flying , so forgive me if i ask some dumb questions. i bought an electric ikarus helicopter with the huey scale body. iv got everything assembled , but i cannot get the rotor blades to balanced. i can assemble the rotor head and have no vibration until the main rotors are installed. then it begins to vibrate so bad, control is impossibe, not to mention, it vibrates so bad, it will occasionally spin the pinion gear off the motor shaft.what is the best way to balance the rotors and what do i use ? any input will be most helpful.

I had hoped someone more qualified in helis would have stepped in here... <_<

Make sure both blades are a matched pair, same weight, etc. Even so, they may or may not be perfectly balanced coming from the factory.

There are special gadgets for heli blade balancing, but you could use an airplane balancer (the type with the rotating shafts/discs - I don't think a magnetic one would work). It has to be one that can accommodate the blades hanging over the side of your work bench or table.

Also make sure the main rotor shaft is PERFECTLY straight, as this can cause much vibration! :yes:

Sorry I have no more sprecific information on how to balance the blades. Seems I remember something about the center balance of one blade has to be checked against the other... :(

Frits (Flying Dutchman) gives good advice in above post.
Check all that.

I am not completely familar with the Ikarus chopper, but.
If the main blades are molded plastic or CF ones and came packaged together, the blade weights should be close enough that you would not get that severe a vibration problem. (goof ups in packageing can occur, so check them anyway)

If the blades mount to the main blade holder with a bolt (drag bolt), make sure the bolt is tightened an equal amount, so that the pressure required to move them back and forth in holder is about the same. When running head up to operational RPMs, and blades do not swing out to equal positions, bad vibs will be present.

Also, there is a chance that the vibs are not comeing from the main head, but are related to sometning wrong in tail rotor area. Check the tail rotor blades and mounting again to make sure everyting is correct back there.

Another thing, if the chopper is collective pitch (increases with throttle advance), check to make sure that as you advance throttle, the blades are both going to same positive pitch because if not, blades will go out of track and cause bad vibs.
Even if machine is fixed pitch, there should be some provision for setting positive pitch adjustment. Make sure both blades are set to same pitch or the out of track will occur and bad vibs.

About all I can think of right now without a look see or hands on.
Good Luck and let us know how works out.