Well the recommended engine is 20-26cc and you said you are not into stick banging type of flight. I have a 17cc in a non 3d aerobatic sport type plane that weighs just over 9 lbs with a 72" WS and it will climb vert., I have a 25cc in a biplane with a 76" WS and it has plenty of power so I would think that a 20cc should hover your plane fine.