I built the Alpha, which is similar to this one. I used a speed 480 with MPjet gearbox and 8 cells. Rolls for 30 feet then leaps from runway. Way more than enough power for this plane.
Empty weight was 16 oz. Can't remember what the AUW is, but it can fly fast or slow. Fast for this plane is much faster than scale speed.
Good luck with yours. jollyroger