- The future cost of oil will drastically increase; due to limited reserves and growing demand. ~ Peak oil; [http://www.lifeaftertheoilcrash.net/]
- Global warming from hydrocarbons will continue to increase; with no current means of stopping it. ~ Dimming the Sun; [http://www.pbs.org/wgbh/nova/sun/]
- Per seat-mile, the helicopter is the most fuel-inefficient mode of transportation there is.
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- Simply improving the rotors, controls or empty weight will be insignificant when compared to the above.
- Any future electric helicopter will have to go back and re-experience the previous seventy years of engine, powertrain and fuel weight reduction.
Can civilian rotorcraft ever be a growth industry?
Depressed