Re: [a-w-h] Blade Balance
- Dan-- I'm no authority, but I put up an Enertech 1800 a few years ago for
my sister. I wasn't satisfied with balance either, and took them back
off, laid each end on scales and matched them nearly perfect. Still it
was out of balance, and I decided that the bolt holes weren't precise
enough to just allow the blade to hang straight down while tightening it
in place. I loosened them slightly, measuring the distance between each
outer blade end, getting them exactly 120� and that did it.
Now if we could keep from burning out motors!! I'm contemplating
installing a second motor of similar size and activate it with a wind
sensitive switch when the power gets appropriate. Has anyone tried this?
------Keep Looking Up!---JP
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- Dan said:
I wonder if there are ways to balance these blades better? I have always
been able to see power
fluctuation on every revolution and can hear the load change the gear
pitch as these blades rotated but was never able to make it better
When ever a blade balance weight gets lost we always see this effect on the
John Parsons said
> I wasn't satisfied with balance either, and took them backOn our 50 foot diameter wtgs the blades weigh almost 800 pounds and we
> off, laid each end on scales and matched them nearly perfect.
balance the sets so the tip weights are with in 2/10 pound (100 grams).
> was out of balance, and I decided that the bolt holes weren't preciseThis tip is important enough to be included in the FAQ. All blades need to
> enough to just allow the blade to hang straight down while tightening it
> in place. I loosened them slightly, measuring the distance between each
> outer blade end, getting them exactly 120° and that did it.
be the same shape and pitch setting and the rotor assembly must be
symmetrical as well as balanced.
> Now if we could keep from burning out motorsHave you tried reducing the pitch angle on the blades? This will make the
stall regulation effect occur at a lower wind speed.