Self launch ultra-light sailplane

Ok, I said I'd do this for a friend who is building his own
ultralight. He wants to design and build( me helping) a sailpalne that
fits the ultralight rules and is able to launch/sustain with a power
unit, he'd prefer electric. Any ideas or comments? Is ther anything
already out there being tried? Just remember I'm the messenger!

larry ( what am I doing) johnson