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