Your setup should be fine. I fly the Transall ( 7,5 pounds) with 2 x 35-48 1100kv, 2 x 60a escs, 10x5 3-blade props and a single 4s 5000 lipo. It flies very well. Landings are really scale. I put the 4s lipo right in the middle of the plane's belly, on a good velcro. I have to say this plane makes people at the club very envious! Have fun with your electric Transall.