If you have the weights at the ends of a long rod like agor's - and the rod isGeorg Künstler wrote:The problem of the 8 heard impacts are not the cylindrical weights.
Remember, when they act in pairs then you should also here 2 parallel impacts which was not the case.
One is going to the rim, the other to the axle.
So if we include this movement then we must hear also an impact on the centre, and not only at the rim on the down going side.
The moving of the cylindrical weights is silent, what does make the noise is the impact of the carrier wheel.
free to slide though the centre barrel - and the rod is 0.9 of the inner
diameter of the wheel casing - then the lower weight will hit the casing but
the upper weight will only move 0.1 diameters towards the barrel axle.
The upper weight will not reach the barrel and so will not hit the barrel and
make an impact sound. The lower weight on the other hand will hit the
casing and make an impact sound.
For 4 rods at 45° around the wheel there will be 8 impact sounds per
revolution as the rod shuttles back and forth, four by the weights at one end
of the rods and four by the weight at the other end .