nafod40 writes:

There's an electric self-launch glider out there now.

http://www.alisport.com/eu/eng/silent_b.htm
http://www.airenergy.de/english/silent/index.htm

Not sure what kind of batteries it uses.

http://www.airenergy.de/english/silent/silent_data.htm
weight 40 kg
energy 1.4 kWh

http://www.airenergy.de/english/silent/silent_ostiv.htm
For reasons of cost and availability, NiCd technology was
chosen for the battery. NiCd offers the highest specific
performance at moderate costs and is available for everyone.
The temperature characteristic and rapid-charge capability
allow high start frequency without overheating of the battery.


http://www.alisport.com/video/AE1.mpg
http://www.alisport.com/video/Jet_Glider.wmv
I want one.

--kyler