I mounted a TT .46PRO on my Avistar but when i tried to balance the plane it was too nose heavy, even placing the 3.1oz RX battery on the tail it still needed more tail weight, so i have a TT .36PRO on the way. If it flies alright an a OS .40la i'm sure the TT .36PRO will be up to the task and 4.5oz lighter than the .46.