You have quite a choice of engines to choose from. The original Nexstar Select has the OS 46 FXi engine installed and this is quite adequate. The OS 55 AX is a lot more power than the 46 is but is not a bad choice. I removed an OS 40 LA from a Hobbico Super Star trainer and put an OS 46 on board with a Macs exhaust. It does very well as a trainer because it has the necessary power to get it off the ground and plenty of reserve in case you get into trouble. All depends on you and your wallet. All are very good choices.


CGr.