I've just modified my needle wheel impeller using the fishing line idea. I wrapped it about 3 or 4 times as per the thread in RC. Unfortunately I'm not seeing the results as others have posted, this includes reducing the air into the venturi modification. Maybe I need to wrap the fishing line a few more times? The trouble with the fishing line is, it's time consuming trying to wrap the line in and over all those spokes. The good thing is that if it doesn't work, ya just pull'er apart and start again. Oh yeah! I also added just a dab of crazy glue to hold the knots together.
Terry
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