Hi You will need as a minimum for scale power an AXI 2826-12 with a 40 amp ESC or for more power and faster aerobatics an AXI 4120 with 22.2 volts and a 70 ESC. Look up
www.victorvalleyrcflyers.com and then at the newsletters from March on for articles on the conversion of the GP Cub which is almost identical. Norm
I love mine and fly it every week.