Blades / was tower vibration [RE-wrenches]

[Roy Butler, Four Winds RE]

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Kirk,

I see this happen often with wood core blades. Moisture has entered the 
wood core and that blade is now heavier.
Moisture is evil.....it gets in there even if no cracks or pits are 
found in the blade coating.

Looks like a field balancing is in store.....have fun!

Gimme a call or e-mail if you need more info on balancing.

Roy Butler
NABCEP Certified Solar PV Installer®
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:

>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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>>
>>
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>>
>>
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