Blades / was tower vibration [RE-wrenches]

[Kirk Herander]

One of the blades is 3.5 oz. heavier than the other two. The blades
appear to be in good shape w/ no balancing weights thrown off and no
sign of cracking or water damage (these are wooden blades). Hard for me
to believe they weren't imbalanced from day one. Go figure.

Kirk Herander
Vermont Solar Engineering
802.863.1202
fax 802.863-7908
NABCEP(tm) Certified Solar PV Installer
Xantrex Certified Dealer Charter Member
NYSERDA-eligible installer
VT Solar and Wind Partner


-----Original Message-----
From: Roy Butler, Four Winds RE [mailto:roy at four-winds-energy.com] 
Sent: Wednesday, April 26, 2006 8:05 AM
To: RE-wrenches at topica.com
Subject: Re: tower vibration [RE-wrenches]


Kirk,

I've been running the same machine for 6 years now. The only 2 
maintenance items I've ever done to it is balance the blades and repair 
the tower mount insert.
Ian is right....it's likely originating from the machine...out of 
balance blades is my guess.

I see that Bob has offered you the blade balancing procedure. It's quite

easy.....off the tower that is!
FYI....check the tower insert for egging of the mounting holes. You 
probably already did this...but it's worth a hard look. The vibration 
almost always loosens the tower mount......and every couple of years I 
have to cut the top 6" off the 2.5" pipe and drill new holes.....

Roy Butler
NABCEP Certified Solar PV InstallerR
NYSERDA eligible PV & wind installer 
Four Winds Renewable Energy, LLC
8902 Route 46
Arkport, NY 14807
607-324-9747
www.four-winds-energy.com



Kirk Herander wrote:

>Hello,
> 
>I have an old World Power H1500 (1500 watt) machine on an 80' homebrew
>sectional steel pipe tower. It's in a high wind area, and has flown
with
>no complaints for 7 + years. Several months ago, the tower started to
>vibrate in high winds, maybe 15 + MPH, when the machine really starts
>cooking. I lowered the tower expecting to find something obvious - but
>no luck. The blades are on tight, the tail boom pivot bolt/bearings
look
>fine, all bolts are tight, no problems with the machine that I can see.
>When the tower is up and brake on, there is the normal several inches
of
>deflection on all guys. But at those higher wind speeds the front and
>rear middle and top guys develop at least a foot of "up and down"
>deflection - it really looks scary - and the tower shakes big time.
What
>am I missing? 
>Could the guys be too tight? Or too loose? Thanks.
> 
>Kirk Herander
>Vermont Solar Engineering
>802.863.1202
>fax 802.863-7908
>NABCEP(tm) Certified Solar PV Installer
>Xantrex Certified Dealer Charter Member
>NYSERDA-eligible installer
>VT Solar and Wind Partner
> 
>
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