On Thu, 8 Nov 2018 18:39:40 +0000, The Natural Philosopher
What's the difference between the battery going flat and running out
of jet fuel?
The rules for electric planes will be similar to those for today's
jets - enough fuel to get there + holding time + diversion time+
various fudge factors (including pilots instinct!).
I'm as doubtful about the date as everyone else.
The former happens after one hour, the latter after ten...
Ah. so that will mean they will be restricted to landing immediately
after takeoff then, at the same airport.,,.
Ive flown more electric aeroplanes than anyone in this group I dare
say. I've done man many calculations on them. In the end all that is
stoipping them is energy density and a bit of safety. Batteries ten
times better would do the job.
Batteries, except lithium air, cannot be made ten times better.
Not even in theory.
Lithium air is a big challenge on safety and on other grounds., They
may never happen.
And they make a plane land heavier than it takes off :-)
Any fool can believe in principles - and most of them do!
On Thu, 08 Nov 2018 20:48:26 +0000, Graham Harrison wrote:
It's by asking such wrong questions we're in the mess we're in generally.
The correct question is "what are the chances of a battery failing
catastrophically compared to the chances of a conventionally fuelled
plane failing catastrophically ?"
Loads of Samsung owners got burned arse cheeks from a non-flat battery.
Anyway, there's no way you'd get the power/weight ratio required for
serious passenger flight without a step change in technology. Currently
(but not exclusively) room temperature superconductors which would
increase the efficiency of motors.
Transport in the future may need a step change in attitude if people decide
they want to travel,
If electric land transport reaches the goal that has been set out out for
it that is going to leave a lot of oil that will now be available for
things where battery stored energy still isn’t practical,it may be
expensive either by becoming a rarer commodity or deliberate political
intent but there will always be some wealthy enough to continue much as
they do now. The ordinary person may find that flying off to a foreign
city just for a weekends birthday pissup is no longer the cheap option that
has been available since EasyJet and Ryanair proved that many were happy
with the equivalent of a flying bus rather than a Railway dining car.
If such people still want to travel cheaply to such destinations then maybe
they could take a hit on the speed of the journey and the airship concept
gets revisited where weight of batteries may not be such an issue and the
energy they need to provide will mainly be for propulsion rather than
keeping the craft in the air as well.
It's still an issue.
But yes, a nuclear electric society is one possible future.
All - or mostly - nuclear is economically viable as France shows.
That leaves you with two problems:
1: Off grid transport.
2: Replacing coal and gas as chemical reducing agents.
Synthetic fuel for both is possible, but way too expensive at the moment.
However if off peak electricity were turned into hydrocarbon fuel, you
might say that fuel cost was essentially zero as the opportunity cost of
keeping a nuke going flat out rather than throttled back is almost zero.
"Women actually are capable of being far more than the feminists will
They will always 'still be available' but at some point too expensive to
compete with synfuels.
Read the linked paper
The problem with hydrocarbon fuels is not really CO2, but things like
injecting H2O high in the atmosphere, and or NOx at ground level.
This suggests that people would prefer BEVS for city use where car
density is high.
And electric aircraft if possible. Electric transatlantic flight is
absolutely on the limits of *theoretical* lithium air technology.
Like fusion its all possible, if only someone knew how to solve the
I'd give it a 50/50 in the next 30 years.
The theory of Communism may be summed up in one sentence: Abolish all
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