Yes well done Voytek the Scott Bonnar 33 looks a very successful restoration , you'd be happy the 33 turned out this well.
I know if two cylinders have the same mass but different diameters, the one with a bigger diameter will have a bigger moment of inertia, because its mass is more spread out. Similarly, if two cylinders have the same mass and diameter, but one is hollow (so all its mass is concentrated around the outer edge), the hollow one will have a bigger moment of inertia.
A rotating object also has kinetic energy ,It follows that the rotational kinetic energy given to the flywheel is equal to the work done by the torque.
The more mass an object has, the more kinetic energy it has.
If I have an empty drink can and compare it too a heavier smaller solid off cut of metal rod the off cut will have more kinetic energy than the empty drink can.
I know what you were referring to Voytek with the " Light weight but large diameter disk " but I just thought I would explain how the mass of an object can still be a critical factor.
