The only other thing that just popped in my mind is to use a bungee cord like sailplanes guys (and some EDF guys) use attach it to the plane and let her rip (kind of like a carrier take-off), that is the only way I could see it maybe getting off of the grass. But then again, the bungee cord to haul a 14lb plane may need to be longer than 300ft.

BTW thats one sweet looking A-4 [sm=thumbup.gif]