ORIGINAL: Sandmann_AU
If it's off centre it'll increase bearing wear, vibration etc... same as an unbalanced spinner or prop will. If it's balanced it's the same as running a heavy prop - flywheel effect.
I have seen a lot of arguments about this and it can get ugly at times. I have used the weighted nuts over the years without any problems with the bearings and they have worked out well for me. I have never tried the weights mentioned so I haven't a clue about them.
The weight of the plane is another point that has brought up a lot of issing matches. My feeling is that today the ARFs are built too light compared to a kit built plane of the same type. I see a lot of old kit planes still flying and doing it very well, not a lot of old light weight ARFs?
No reason for any replys to that statement, just something I have noticed.