In a message dated 04/15/2005 05:26 Central Daylight Time,
lendich@optusnet.com.au writes:

<< Lynn,
 Good info on balancing the two rotors.
 Does the rotor have to balanced within itself for a best balancing outcome.
 I'm doing a 'single rotor' and was wondering if I need to go that far.
 George ( down under)
  >>

The rotors are balanced dynamically (spin balanced) from the factory and then
hand selected into sets that weigh the same within a few grams. Notice some
balance marks on all but one corner (generally).

If you have not machined anything off of the rotor, it will still be
dynamically balanced, and need no further attention. In the single rotor, the whole
rig is going to be dynamically balanced, so the two counter weights will equal
the weight of the rotor exactly. There may be some not obvious tricks like
misbalancing to account for power pulses or similar. Check with another builder so
as not to reinvent the wheel on that. Paul Yaw, Richard Sohn or Dave Adkins
come to mind.

Lynn E. Hanover