tower vibration [RE-wrenches]

Ian Woofenden, Home Power ian.woofenden at homepower.com
Tue Apr 25 19:57:37 PDT 2006


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Hi Kirk,

Did you check the blades for balance and 
tracking? That would be my first guess. Seems 
like it has to originate with the machine...

Ian

>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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Ian Woofenden <ian.woofenden at homepower.com>, Senior Editor
Home Power magazine; Subscriptions: $22.50 per 
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