In sci.physics, Rich Grise
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wrote
Why would the engine be resource-hungry? Of course the
fuel source would be -- but Brad's hypothesis, taken at
face value, would assume terawatts of power available from
these clean, simple towers, convertable into synthesizable
hydrogen peroxide.
Except that the towers are neither clean nor all that simple.
- Cleanliness: The PV aspect is the most troublesome; the
research continues and may very well solve this problem
but at present the return on investment of a simple
solar cell, at currentelectricrates, is approximately
its expected lifetime -- about 20-50 years. Of course
part of it is that the PV is not part of a sophisticated
solar/wind powered tower, apparently (not that that would
make all that much difference; wind power doesn't come out
of nowhere, after all).
- Simplicity. The tallest man-made structure is about
341 m in height (in the USA, anyway; I'd have to check
for buildings in other places e.g. Petronas towers
in Malaysis) with quite a bit of complexity such as a
generally tapering structure (in the case of the Empire
State Building, it's blocky). Modern skyscrapers are
designed to flex. I've already mentioned the shadowing
problem; I should mention that there's a certain issue
regarding wind shadowing as well. Presumably the wind,
hitting the blades of a windmill, gets deflected in
various interesting ways, dissipating its energy --
and rendering the wind relatively useless for a windmill
following.
As forH2O2synthesis from raw materials -- I'd have to look.
Presumably this is Brad's notion more or less as well.
However, AIUI crystallizedH2O2is very touchy to handle
-- an issue if a vehicle has been sitting for too long.
There's also the possible problem of spontaneous breakdown.
Certain contaminants in the mix -- you mention manganese
dioxide; I know nothing about it but that's certainly one
possible contaminant! -- would break down the peroxide,
either slowly over time, yielding relatively useless water
and oxygen (from a power standpoint) -- or explosively.
At least gasoline more or less vanishes through evaporation
(though the result might be smog if there's enough of it).
It is also explosive but only under relatively controllable
conditions; it requires a rather specific fuel-to-air
ratio. Of course its flammability is a concern, but then
so are coal's, wood's, and chicken fat's, given the right
conditions.
And gasoline is long-term stable; it's not likely to do
weird things such as polymerize or spontaneously decompose,
under proper storage conditions.