It's definately a blade balance issue, but I've carefully run through
the balancing instructions and I can't find any blade that's heavier
than the others. I'm sure that there are some harmonics that are
causing it, but I haven't been able to figure out how to balance it.

None of the PVC fittings that came with it provided what I would call a
snug fit. There was a good 1/16" clearance around the pipe, which
certainly is enough to allow vibration.

-- Geoff


"Doug Dotson" wrote in
:

What kind of speeds are producing this effect? My KISS doesn't
produce any significant vibration up to 30 kts or so. That is as fast
as I have run it. Have you checked the balance of the blades? A
slight unbalance in the blades might induce a vibration in the
mounting. I chose to use 2" SS tube rather than sched 40 pipe. The
PVC fitting is a snug fit. The KISS came with an assortment of
fittings to fit a number of different kinds of pipe. If the 2" tube
fits the KISS better than the sched 40 pipe, perhaps attaching a short
length of 2" tube to the top of the pipe for mounting would be a
simpler solution.

Doug
s/v Callista

"Geoffrey W. Schultz" wrote in message
. 16...
I have a KISS wind generator that develops vibration at certain wind
speeds. The problem is that there's a PVC fitting that goes over a
2" stainless schedule 40 support pipe that is loose fitting. I want
to machine one with a sleeve bearing on a lathe and make it out of
plastic. However, I really don't have any experience machining
plastic, I've been looking at www.mscdirect.com under Raw
Materials/Plastic Material/Rods for 3" material. To keep costs under
control I'm looking at the following:

Nylon
Acetal
UHMW
LDPE
HDPE

Comments on the machining qualities, UV resistance, and overall
strength
of
these would be greatly appreciated.

-- Geoff