Blades / was tower vibration [RE-wrenches]

[Darryl Thayer]

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Kirk 
what is the total weight of the blade?  I am surprized
that as little as 3.5 OZ would cause such a large
vibration?

--- Kirk Herander <kirk at vtsolar.com> 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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