On 24/08/2020 10:02, Dave Liquorice wrote:
On Sun, 23 Aug 2020 18:23:40 -0700 (PDT), wrote:

All is fine until there is an accident. The flywheel dislodges and

continues like a much more energetic panjanderam, demolishing
everyone
and everything in its very long path.

Yes, though that's mostly solvable. 2 counterrotating flywheels in one
casing with a mechanism to jam them together on impact.

Er, Where does all the kinetic energy go? OK in theory you have equal
an opposite amounts so they "cancel out". But two identical cars
traveling at the same speed in opposite directions into each other
end up a right mess disspiating their kinetic energy,

I think you'd get a big BANG, the desruction of the flywheels and
generation of lots of high speed shrapnel. The latter might be
possible to contain, they manage it with blade failures on jet
engines.

Yes.The problem of energy storage and safety is simple. If it all gets
out at once - BIG trouble!

That is why coal and uranium are so good. Its bloody hard to get it all
out at once.

diesel level hydrocarbons are a decent compromise as is petrol

hydrogen and batteries and flywheels are plain dangerous.

As is water-up-a-hill.
To an extent large fixed installations can be remote and built strong,
but transport needs low weight and that means compromising safety


--
"The most difficult subjects can be explained to the most slow witted
man if he has not formed any idea of them already; but the simplest
thing cannot be made clear to the most intelligent man if he is firmly
persuaded that he knows already, without a shadow of doubt, what is laid
before him."

- Leo Tolstoy