Originally Posted by

**shune2001**
Hi,

I have this question and need your help please..

If you have a crank shaft (lets say of a bike), rotates with variable speed, and you have a flywheel that is automatically engaged/disengaged to/from the shaft.

How the flywheel, in this case, affects the power of the shaft ? if I want to include the effect of the flywheel on the overall shaft`s power what formula should I use ?

I know the Inertia of the flywheel, and also I can calculate the energy of the flywheel using 1/2 * I * w^2. Can I say that: during engagement with the shaft, the work done on the flywheel by the shaft is the resultant flywheel energy which is (E=1/2 * I * W2^2 - 1/2 * I * W1^2), then take the derivative of the Energy to get the power(P=dWork/dt) and add it to the overall shaft's power as the flywheel's effect on the system ? or this is not correct ?

Any idea would be appreciated..