110 is all you need MAX to keep weight at around 8lbs 2 oz.. i have flown ADDICTS plane with the 91FX..I was very suprised by the perfomance it did everything i could throw at it and alot of things my U-Can-Do wont with the 91FX.i think it flies fine with it . My U-can-do weighs only 3 oz more than his harrier with a 110YS. the YS does quite a bit more power though. the harrier blows my U-Can_do away perfomance wise in 3d. now i want one but i only have 1 YS 110.. wish i had a truck load of them but they are always backordered[:@]