I think you will find the .40 LA excellent as power for a trainer. Over and over, I see well meaning people counsel newbies to put a .46 on their trainer so they will have the more powerful engine for the "next" airplane, not because the trainer requires it. That'e exactly where you are now, isn't it? Putting the .46 on the Tiger 2. Thats a good next step. Do put the .40 LA on the trainer, it doesn't have the power of the .46, however it does have good power to fly the trainer. 2 suggestions I have for the 40LA: use an APC 11.5X4 prop, and drill out the muffler exhaust tube to 6mm. I think you will like it.