Hi!
If you fly at sea level a 11x5 or 11x6 APC is what works best in a high winged trainer.
10x6 is not a good prop size if used on the OS LA. 40 or .46 if you have a trainer in mind.The reason for this is that the LA engines doesn't like to rew that much...but they are good stump pullers and can handle rather large diameter props!