Greg Arnold wrote:
I see that the webpage now has pictures of the latest design, with a
bigger prop, and a more streamlined attachment to the spinner. Also a
video of it running at Aero.

After the flight tests this summer, it will be interesting to get
information about its real world climb rate and range.

http://www.front-electric-sustainer.com

Why not go self launch, discarding the batteries and using a detachable
1000 m to 1500 m long aluminum extension cord to the glider, which would be
connected to batteries or an electric generator on the ground. Launch would
require circling up to release altitude (not much different than
thermalling.) But since this is just an off-the-cuff idea, I can see some
issues with side loads of the extension cord during circling, even if the
cord is attached at or near C.G.

And for sustainer or temporary boost, I suppose one could still include
some on-board battery power.