Originally Posted by
abgd
Some of the newer lithium polymer batteries have astonishing power densities. For example, a battery weighing a kilogram might be able to supply over 30 volts and 200 amps for a minute or so - about 10 horsepower. Brushless motors have a very good power to weight ratio too - my 3 horsepower motor weighs about 700g. So you can get large transient amounts of additional power with a relatively modest increase in weight.
Take a look at what is going on the world of model aircraft (R/C) ... almost at the stage where electric is the norm, due to massive improvements in both motor and battery technology; incredible power:weight and at reasonable cost. Can only be a matter of time before it is scaled up to full size. In fact there are 1/4 and even 1/3 scale (of full size) models already flying electric.
Also many model turbines flying as well, though not turbo-prop, maybe that's the next development. Model turbines flying at £1200-1300, surely scaling up could result in a financially viable alternative?