On Fri, 5 Oct 2018 at 23:44, David C Brown <dcb.home@gmail.com> wrote:

> Better done with water than solids.   Mature technology and 80/100
> efficient
>
> The arguments for concrete included higher density, being made from waste
products (with lower cement content than usual).
A track based system employs different technology to water based systems.
Both have pros and cons.

Very high head systems do not need the equivalent of the high pressures
that water uses.
eg a 1000 foot (metre) altitude gain system only exposes the vehicle to
stresses proportional to the mass of the payload regardless of where it is
on the track.

In NZ we have numerous large water based systems where the water is
returned to the reservoirs using open-air solar-powered vapour-phase based
transfer.

Russell


>
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