mprather(at)spro.net
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 Posted: Wed Sep 05, 2007 3:21 pm Post subject: A123 Systems Nano-phosphate technology and aircraft (w |
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For range/payload performance, it seems that it's tough to beat power
plants which directly convert chemical potential (fuel) to mechanical
kinetic (driving a propeller). Especially since you only have to bring
part of the reactants with you - there's already an oxidizer in the air.
Converting chemical potential to electrical (discharging a battery) and
thence to mechanical seems to me incurs an extra step, and extra steps are
always lossy. Having to carry both reactants with you is a steep penalty
as well (a battery). Fuel cells can use air as a reactant, but their
reaction rate densities have been so low as to make them impractical for a
flying vehicle.
Regards,
Matt-
[quote] You can do a fantastic electric motor glider, but nothing long range.
Imagine if gasoline weighed about 100 lbs per gallon and you will
understand the range issue.
These "Nano-Phosphate" type cells will make a big dent in the weight of
airplanes soon. As you can see, they put out a huge amount of power for
their weight, so they will be perfect starting batteries for airplanes.
This specific type of battery has none of the safety issues that other
high-power batteries have.
If you are interested in a good technical discussion about this new
high-power battery technologies, in comparision with other types of
cells, here is a link:
http://www.spectrum.ieee.org/print/5490
Bill Dube'
longg(at)pjm.com wrote:
> Very kool, this stuff "will" fly airplanes one day. Why not now? I
> understand Boeing has an electric bird in development now.
>
> --
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