> This is an ingenious and simple method of increasing the effective
> inertia of the flywheel.  The flywheel rotates twice as fast as it
> would otherwise and therefore has four times the inertia

Don't like to be picky, Nick, but shouldn't that be "momentum"?

Inertia is what has to be overcome to move a body.  Momentum is what
has to be overcome to bring it to rest.

Admittedly it would have increased inertia when stationary.  But isn't
a moving flywheel is all about momentum?  Or have I got it all wrong?

Kind regards MMDers

Bob Essex
Warwickshire, England.