Quote:
Originally Posted by nibs
The method we used for balancing was as follows;
1) we made an insert for the center hole of the prop, the same thickness as the prop at its hub.
2) the insert had a center hole sized for a piece of mono fishing line.
3) the fishing line was inserted through the insert and knotted on the lower side.
4) the prop was suspended by the fishing line.
5) a truly balanced prop would sit horizontally
A zig zag paper would tilt the prop if placed on either side of the prop, or at the leading edge or trailing edge. It was a very accurate scale which we used to sell to ultralight pilots so they could balance their own props.
I will save BS stories for campfires, rather than something as interesting and important as wind turbines.
Cheers.
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Wow! That's amazing! I was picturing the prop in the normal vertical posistion.
I can see how the center suspension line could work. I bet even exhaling a little air on a blade would tilt it!
A zigzap paper is SO light, it must have moved the prop pretty slowly..
Magnetize one of the bolts and you would have a really big compass!
That center insert shouldn't be too hard to make on a good lathe..
Pretty dang cool technique. Thanks for sharing.
Cheers,
Rich