the rcs 1.4 really is not a heavy motor it still requires a motor mount and muffler like most motors off course you have to run a battery on the ing also. i have mine on a funtana and that baby would have been tail heavy w/o the int battery. in that case i would have had lets say an os-160 on there and running about the same weight less the int battery but now 4-5 oz on the nose with lead to acheive balance. Of course the os-160 would smoke the plane in comparsion to power. yes 8 oz will last a very very long time on the rcs 1.4 sipping the go go juice. My 1.4 will torque roll the plane and pull out of a hover very slow and steady, its not overpowered by any means. I treat the funtana as a fun fly and i keep her in very close and fly moves like rolling elevator/harrier, elevator, t-rolls. i weighed mine at 3 lbs with the motor on a mount with the muffer attached. On some motors with a mount this weight can be beat but again on others once you put that muffler on there along with a mount you are right were the rcs is located......