"GeoffSchultz" wrote in message
oups.com...
I recently had to replace 2 of the blades on my KISS wind generator due
to small cracks which I found near the mounting holes. The blades were
replaced with spares purchased at the same time that the generator was
purchased. One of the replacement blades weighs a lot more than the
other blades and none of the blades weighs the same, even in the
complete spare set. This is causing a lot of vibration.

KISS supplies a lead tape to place along the back side of the blades to
balance them. I made a scale to balance the blades such that they all
weighed the same. One blade ended up with 4" of tape, another with 12"
and one with 18". Even though they weighed the same, it was even worse
than before.

So, does anyone have any ideas how to determine who to determine where
the tape needs to be placed?

-- Geoff

P.S. I'll be out of Internet access for a few days.

You can't balance them by statically weighing them. My KISS
was able to be balanced by trimming maybe less than an inch of the tape
from 1 or 2 of the blades. Did you try and balancing them according to the
procedure in the manual? I had no trouble doing it that way. The balance of
the blades depends not only upon the weight but the distribution of the
weight
along the length of the blade. ie a bit of weight further out on the blade
has
more affect than the same amount of weight close to the root. Also,
replacing only 2 out of three blades may not be a good idea. My KISS blades
after 3 years of service have clearly eroded. I do have a spare set and I
suspect
that the new blades probably weigh more than the original ones.

My suggestion is to use a complete set of new blades and use the original
balancing technique.

Doug
s/v Callista