Looking at the specs of the mowers I notice that all are rated to spin at 4300rpm.
The three mowers all have the same chassis and only differ in the following:
30cm blade 1400w motor
33cm blade 1450w motor
35cm blade 1500w motor.
As all three are rated to run at 4300rpm...
To develop the practical example further, or rather, the situation that got me thinking about it...
A lawnmower has a 1450w motor and has a 33cm blade. The next model up has a 35mm blade and a 1500w motor.
Both models have the same chassis. Only the blades and motor are different...
How do I calculate the force exerted on the fulcrum (center) from a spinning blade and the effort required to spin it.
In a practical example:
A spinning lawnmower blade. If the blade of length x and mass y was exchanged with a heavier longer blade how much more effort would be required...