... However, the design is compatible with both electric (EP) and gas engine (GP) power sources. While ... R/C System/ 4-channel, 4-servo + 1ESC (EP)/4-channel, 5-servo (GP) for airplanes400-500W class ... (GP) Technical Data Length1,125mmWidth1,300mmWeight2,050g approx.(EP) / 2,000g approx.(GP)Motor400-500W class brushless ... Clark YR/C System4-channel, 4-servo 1ESC (EP) / 4-channel, 5-servo (GP)(sold separately ...