Here is a video of a composite launch of a LAK 17 by means of auto-tow
followed by using the electric sustainer that is installed in front of
the pilot. Looks like a promising new launch method provided the car
gets the glider high enough for a dealing with any launch
interruptions.
http://blog.cafefoundation.org/?p=4759
It says nothing about the time it takes to get to around 1,500' AGL,
the altitude I usually release from tow. The remaining charge in the
Li-Po batteries may not be sufficient for a normal stustainer
operation (20-30 min) at the end of the day but you can always throw
in more batteries, I suppose.
Herb, J7